German Medina It 's experiences

Ing. William Castillo García: Bienvenidos

germanmedinavirtual@gmail.com (German Medina Neria) — Wed, 17 Jun 2009 04:21:00 +0000

Ing. William Castillo García: Bienvenidos

CM process registration

germanmedinavirtual@gmail.com (German Medina Neria) — Tue, 16 Sep 2008 03:46:00 +0000

Product : CATV
Part Involved : CM Motorola SB5101
Summary: Checking levels of upstream path
Scenario : Ensure return commands to HeadEnd
Company : ISP on Ecuador
Reference Date : September 2008.

The fordward (downstrean) is based on 256QAM and checking returns values through web tool monitoring CM levels, we can find next between modulation and SNR

QPSK 18dB
16QAM 21dB
64QAM 30dB
256QAM 33dB

Local ip address assigned for CM is 192.168.100.1 and ensure the RF cable is connected into CM before to turn it.

Remember that , CM has its HFC MAC (ID based on hexadecimal number) and MTA MAC is the ID assigned to MTA (HFC MAC + 2), here I add some terms related to this issue :

- After the begin ranging process (CM and CMTS confirm power level and what time should synchronize, calculate delay of the link, search the CMTS's slot and set up the schedule list). CM registered with CMTS.

- MTA send a "DHCP discovery"

- DHCP Send MTA an IP address, provisioning mode, MTA TFTP filename and other information in the DHCP options

- MTA asks DNS to resolve Provisioning Server FQDN

- DNS responds with IP address of Provisioning Server

- MTA requests its Configuration File from TFTP Server

- TFTP responds with Telephony Configuration File

- MTA sends Sys Log notification of provisioning complete (optional)

- MTA sends SNMP NOTIFY of provisioning complete to Provisioning Server (optional)

CMTS & CM

germanmedinavirtual@gmail.com (German Medina Neria) — Sun, 31 Aug 2008 23:27:00 +0000

Product : CATV
Part Involved : CMTS BSR 64000
Summary: Connections involved from the HUB to the client
Scenario : Troubleshooting and following the best levels of RF
Company : ISP on Ecuador
Reference Date : August 2008.

Recomendations to follow :

- Always check the logic card configuration (domain) if this one was configured like 1x8 or 2x 1x4 and based on this will plug the test cable US / DS. For example ; talking about the configuration 2x 4x1 (with this ISP) DS0 is related to US 0,1,2,3 and DS1 is related to US 4,5,6,7, that is the downstream is loaded by 4 upstream.

- If CM was registered and this one is moved to several hubs, first connect the RF cable to CM and after that turn on it, otherwise the registration process takes more time because it is not going to find the downstream carrier will start to scan frecuencies.If CM does not get up, then check its status like as SNR levels, its probably the attenuation should be adjusted, and cables on bad states can cause communications problems between CM and CMTS

Take next as level of reference :
CMTS Tx = +55dBmV
CMTS Rx = +14dBmV (+/- 1dB)
CM Tx = 35 to 55 dBmV
CM Rx = 0 dBmV (+/- 5 dBmV)

Raid over VmWare

germanmedinavirtual@gmail.com (German Medina Neria) — Thu, 03 Jul 2008 20:52:00 +0000

Product : Raid
Part Involved : Linux virtualization over VmWare
Summary: Management raid
Scenario : Testing & troubleshooting new features over linux
Company : National Institute of Cancer Sickness of Peru (INEN).
Reference Date : January 2008.

There are two videos that I have uploaded available taking this issue :
(1) Part 1 http://www.youtube.com/watch?v=gecy796j23o
(2) Part 2 http://www.youtube.com/watch?v=86n8rRyU29Y

and basically the command procedure follows the next steps :

> fdisk -l
> fdisk /dev/sdh
m (menu)
n (add new partition)
p (primary partition)
1
391 (cylinder 1-391)
p (print partition table)
L (list type of partitions available)
fd (Linux Raid Auto)
t (change system identification of partition)
L (List)
fd (Linux Raid Auto)
p (print partition table)
w (save & exist)
> fdisk /dev/sdi
> fdisk /dev/sdj
> ls /dev/md0 -l
> mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdi1 /dev/sdj1
> mkfs.ext3 /dev/md1
> mkdir /oracle/
> mount /dev/md1 /oracle/
> df -lh
> cp /var/log/* /oracle/ -rf
> ls /oracle/
> vi /etc/fstab
** /dev/md1 /oracle ext3 defaults 0 0
:wq!

Power Off Computer
Erase disk7, disk9, disk10
Power On Computer

> df -lh
> mdadm --monitor /dev/md1
> ls /oracle/
> mkdir /oracle/hola/
> fdisk -l
** J does not have partition
> fdisk /dev/sdj
m (menu)
p (primary partition)
1-261
t (change system identification of partition)
fd (Linux Raid Auto)
p (print partition table)
w (save & exit)
> mdadm --manage /dev/md1 --add /dev/sdj1
> fdisk -l : less

Dlink & uPnP

germanmedinavirtual@gmail.com (German Medina Neria) — Sun, 15 Jun 2008 04:25:00 +0000

Product : dLink DCS 2100 & dLink DI-624
Part Involved : Port 1900 (UpNp)
Summary: With no appearently reason your LAN activity has increased a burst of broadcast
Scenario : There are some delays inserted into you LAN connections.
Company : National Cancer Institute of Peru (INEN).
Reference Date : February 2008 to April 2008.

There is a hidden knowledge that is only enough to assign an ip address an every equipment connect to our LAN connections, but what happen is this device saves to itself additional functions of routing tasks when at the begining was buyed to fullfill another function ?

But it works perfectly, after your plugged it on the outlet LAN (it is sure that you are going to forget it!), and that is according to my experience in the case of this two models, but monitored with the help of WinDump application in order to identify the device connected and the ports used, when and how.

I have attached two procedures videos to detect the activity to these ports related to this issues and the later steps to disable UpNp in the device.

I sure you, that this type broadcast will not become again, at least not for this reason !

Assign IP to CISCO 2960

germanmedinavirtual@gmail.com (German Medina Neria) — Wed, 14 May 2008 03:07:00 +0000

Product : CISCO 2960
Part Involved : Switching equipment.
Summary: Procedure of Ip configuration of switching equipment.
Scenario : Previous tasks to consider before to install switching equipment in tele room
Company : National Cancer Institute of Peru (INEN).
Reference Date : April 2008.

It is not possible to exploit the overall options of the switching equipment if this one previously is not defined and assigned the ip configuration, with this little step ensures the remote management of the equipment as the other hand you dispose : Open the conecction with the equipment to connect it by using internet explorer browser and telnet with cli commands.

As we can check, the video is based over the reviewing of the next concepts :
(1) The factory ip assigned of the switching equipment is 10.0.0.1
(2) The Pc is configured using the ip 10.0.0.200 in order to establish a connection with switching equipment.
(3) The Ip of the switching equipment is saved with the value 192.168.88.31
(4) the pc is reconfigured using the ip 192.168.88.200 with the purpose to establish connection with switching equipment and check its update of ip configuration.
(5) Check the video to confirm these steps.

! Remember, if you you do not proceed with the change of ip address of every new switching equipment you can crash your LAN connections because there are ip conflicts !

Later in another articles, I will take some ways to show you How to catch up some troubleshooting issues linked with this issue.

Handing RJ45 Jacks

germanmedinavirtual@gmail.com (German Medina Neria) — Sat, 05 Apr 2008 03:45:00 +0000

Product : RJ45 Jacks connectors over cat6.
Part Involved : Infrastructure of telecomunication room.
Summary: Management the ending of the horizontal cabling inside telecomunication rooms.
Scenario : A burst growing of the LAN data ports in your company.
Company : National Institute of Cancer of Peru (INEN).
Reference Date : April 2008.

Although add new data ports to the current structured cabling involved civil works in order to tending the cable, then another bottleneck does not consider the most time is the distribution of the space inside of the telecomunication room. Check with the next video , how the ending cable cat6 is not easy to hand -the cable is not soft, can be damaged if there is no previous precaution during tending task - and when this point is reached certainly the personnel assigned to this job come very dirty.

It is important to clear that pin wire assigned color of RJ45 jack connector of the telecomunication room should be fix with the RJ45 jack connector of the outlet box (office) assigned to that cabling connection.

The first part of video shows the procedure to insert the wire into RJ45 Jack connector following the color code based on Code A or Code B -assigning the same to telecomunication room and office- and put the connector inside of the patch panel, while the second part is focused on the front view of the telecomunication room to connect the patch cord from the patch panel port to the free switch port.

The full version is available on "YouTube videos hosted by German Medina" at the bottom right side of this page.

Warning with MSN chat

germanmedinavirtual@gmail.com (German Medina Neria) — Sun, 16 Mar 2008 00:41:00 +0000

Product : Trojan Virus
Part Involved : Security Issue.
Summary: A new virus threat has been hidden between MSN chat.
Scenario : Chat has changed our daily lives and imagine if that security is broken.
Company : Owner.
Reference Date : March 2007.

We are exposed to the most strange broadcast virus, it slides quickly between MSN chat conversation in every moment; the impact is very dangerous, because it hides itself behind the MSN chat conversation, then you appearently answer and following the main issue of your MSN chat conversation, when suddenly you receive an invitation to download some file (containing some pictures) adding a text like as "check my pictures taken on some place" and then you are ready to fire the cold chain.

I have seen when you are warn to receive the download file (appearently from your contact or friend) the contact disappear from the contact list (the virus disconnect him or her) while at the same time is inviting you to confirm to download the miracle file. Up to here, you are not consciosnous that you have lost the connection with your contact and you are close to open an unknown file. Imagine That !

In the extreme case when you download that file an execute it then you will notice that you lost the mouse control while the MSN chat window starts to flash and the another application flashs too. Then I recomend this :

1.- Unplug your LAN connection, then you will focus the control of mouse and every thing into desktop.

2.- Reset your computer and boot on safe mode and execute your AntiVirus system as first step

3.- Reset your computer and boot on normal mode and execute too your AntiVirus system as your next step.

The virus is identified as back door trojan and it saves a file named myspace-layout(1).jpg into the cookies and temporal carpets of Internet explorer.

Although I have checked that virus can send message into spanish and english, like as next pictures :

Export LAN configuration

germanmedinavirtual@gmail.com (German Medina Neria) — Wed, 05 Mar 2008 04:19:00 +0000

Product : Parameters used into LAN.
Part Involved : LAN configuration..
Summary: It is an interesting short procedure to export into a file all the parameters related with LAN configuration of your Pc.
Scenario : Adding diversity to use the file exported.
Company : National Institute of Cancer of Peru (INEN).
Reference Date : March 2008.

I suggest to some people to use next procedure to backup their LAN configuration, if your day to day is necessary changing LAN configuration then fixs you. Then from the command prompt windows (DOS) then type :

netsh dump>C:\IpConfiguration.txt

Here begin an example of that file ******
#========================
#Configuraci¢n de interfaz
#========================
pushd interface
reset all
popd
# Fin de la configuraci¢n de interfaz
#==========================
#Configuraci¢n de interfaz
#==========================
pushd interface ipv6
uninstall
popd
# Fin de la configuraci¢n de interfaz
# ------------------------------------
# Configuraci¢n de ISATAP
# ----------------------------------
pushd interface ipv6 isatap
popd
# Fin de configuraci¢n de ISATAP
# ----------------------------------
# Configuraci¢n de 6to4
# ----------------------------------
pushd interface ipv6 6to4
reset
popd
# Final de la configuraci¢n de 6to4
#==================================
# Configuraci¢n del puerto de proxy
#==================================
pushd interface portproxy
reset
popd
# Fin de configuraci¢n del puerto de proxy
# ---------------------------------------------
# Configuraci¢n de la interfaz IP
# ---------------------------------------------
pushd interface ip
# Configuraci¢n de la interfaz IP para "Conexi¢n de rea local"
set address name="Conexi¢n de rea local" source=static addr=192.168.31.11 mask=255.255.224.0
set dns name="Conexi¢n de rea local" source=static addr=none register=PRIMARY
set wins name="Conexi¢n de rea local" source=static addr=none
popd
# Fin de la configuraci¢n de la interfaz IP
# =========================================
# Configuraci¢n RAS
# =========================================
pushd ras
set authmode mode = standard
delete authtype type = PAP
delete authtype type = SPAP
delete authtype type = MD5CHAP
delete authtype type = MSCHAP
delete authtype type = MSCHAPv2
delete authtype type = EAP
add authtype type = MSCHAP
delete link type = SWC
delete link type = LCP
add link type = SWC
add link type = LCP
delete multilink type = MULTI
delete multilink type = BACP
add multilink type = MULTI
add multilink type = BACP
set user name = Administrador dialin = policy cbpolicy = none
set user name = Asistente de ayuda dialin = policy cbpolicy = none
set user name = Invitado dialin = policy cbpolicy = none
set user name = SUPPORT_388945a0 dialin = policy cbpolicy = none
set user name = VUSR_FILESERVER dialin = policy cbpolicy = none
set tracing component = * state = disabled
popd
# Final de la configuraci¢n RAS .
# -----------------------------------------
# Configuraci¢n de acceso remoto de AppleTalk
# -----------------------------------------
pushd ras appletalk
set negotiation mode = allowset access mode = all
popd
# Fin de la configuraci¢n de acceso remoto de AppleTalk.
# -----------------------------------------
# Configuraci¢n IP RAS
# -----------------------------------------
pushd ras ip
delete pool
set negotiation mode = allow
set access mode = all
set addrreq mode = deny
set broadcastnameresolution mode = disabled
set addrassign method = auto
popd
# Fin de la configuraci¢n IP RAS.
# -----------------------------------------
#Configuraci¢n IPX RAS
# -----------------------------------------
pushd ras ipx
set negotiation mode = allow
set access mode = all
set nodereq mode = allow
set netassign method = autosame
popd
# Fin de la configuraci¢n IPX RAS.
# -----------------------------------------
# Configuraci¢n NBF RAS
# -----------------------------------------
pushd ras netbeui
set negotiation mode = allow
set access mode = all
popd
# Fin de la configuraci¢n NBF RAS.
# -----------------------------------------
# Configuraci¢n RAS AAAA
# -----------------------------------------
pushd ras aaaa
set authentication provider = windows
set accounting provider = windows
delete authserver name = *delete acctserver name = *
popd
# Fin de configuraci¢n RAS AAAA.
# Configuraci¢n de enrutamiento
pushd routing
reset
popd
#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
## ## ANTES de ejecutar esta secuencia de comandos ## #
# Para restaurar la configuraci¢n del enrutador IPX #
# DESINSTALE IPX desde la carpeta Conexiones de red y #
# vuelva a instalarlo. ##
## Esto eliminar la anterior configuraci¢n del #
# enrutador IPX y la restaurar a sus valores #
# predeterminados ##
##!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!#
#----------------------------------------------------------
# Configuraci¢n IPX
#----------------------------------------------------------
pushd routing ipx
#----------------------------------------------------------
# Configuraci¢n de la interfaz IPX
#----------------------------------------------------------
#----------------------------------------------------------
# Configuraci¢n del filtro de tr fico IPX
#----------------------------------------------------------
#----------------------------------------------------------
# Configuraci¢n de la ruta est tica IPX
#----------------------------------------------------------
#----------------------------------------------------------
# Configuraci¢n del servicio est tico IPX
#----------------------------------------------------------
popd
# Fin de la configuraci¢n IPX
#----------------------------------------------------------
# Configuraci¢n RIP IPX
#----------------------------------------------------------
pushd routing ipx rip
popd
# Fin de la configuraci¢n IPX RIP
#----------------------------------------------------------
# Configuraci¢n SAP IPX
#----------------------------------------------------------
pushd routing ipx sap
popd
# Fin de la configuraci¢n IPX SAP
#----------------------------------------------------------
# Configuraci¢n NETBIOS IPX
#----------------------------------------------------------
pushd routing ipx netbios
popd
# Fin de la configuraci¢n IPX NB
N§ de configuraci¢n IP
pushd routing ip
reset
set loglevel error
add preferenceforprotocol proto=LOCAL preflevel=1
add preferenceforprotocol proto=STATIC preflevel=3
add preferenceforprotocol proto=NONDOD preflevel=5
add preferenceforprotocol proto=AUTOSTATIC preflevel=7
add preferenceforprotocol proto=NetMgmt preflevel=10
add preferenceforprotocol proto=OSPF preflevel=110
add preferenceforprotocol proto=RIP preflevel=120
add interface name="Conexi¢n de rea local" state=enable
set filter name="Conexi¢n de rea local" fragcheck=disable
add interface name="{657F0909-4AD3-489F-9D92-31F8F9100540}" state=enable
set filter name="{657F0909-4AD3-489F-9D92-31F8F9100540}" fragcheck=disable
add interface name="{E5329AA6-02CF-4A1E-AE97-26DCA879A372}" state=enable
set filter name="{E5329AA6-02CF-4A1E-AE97-26DCA879A372}" fragcheck=disable
add interface name="Bucle invertido" state=enable
set filter name="Bucle invertido" fragcheck=disable
add interface name="Interno" state=enable
set filter name="Interno" fragcheck=disable
popd
# Fin de la configuraci¢n IP
# ----------------------------------
# Configuraci¢n proxy DNS
# ----------------------------------
pushd routing ip dnsproxy
uninstall
popd
# Fin de configuraci¢n proxy DNS

# ----------------------------------
# Configuraci¢n IGMP
# ----------------------------------
pushd routing ip igmp
uninstall
popd
# Fin de configuraci¢n IGMP

# ----------------------------------
# Configuraci¢n NAT
# ----------------------------------
pushd routing ip nat
uninstall
popd

# ----------------------------------
# Configuraci¢n OSPF
# ----------------------------------
pushd routing ip ospf
uninstall
popd
# Fin de configuraci¢n OSPF

# -----------------------------------
# Config. del Agente de retrans. DHCP
# -----------------------------------
pushd routing ip relay
uninstall
popd
# Fin de la configuraci¢n Agente de retransmisi¢n DHCP

# ----------------------------------
# Configuraci¢n RIP
# ----------------------------------
pushd routing ip rip
uninstall
popd
# Fin de configuraci¢n RIP

# -------------------------------------------------------------------------
# Configuraci¢n de descubrimiento de enrutadores
# -------------------------------------------------------------------------
pushd routing ip routerdiscovery
uninstall
add interface name="Conexi¢n de rea local" disc=disable minint=7 maxint=10 life=30 level=0
add interface name="{657F0909-4AD3-489F-9D92-31F8F9100540}" disc=disable minint=7 maxint=10 life=30 level=0
add interface name="{E5329AA6-02CF-4A1E-AE97-26DCA879A372}" disc=disable minint=7 maxint=10 life=30 level=0
add interface name="Bucle invertido" disc=disable minint=7 maxint=10 life=30 level=0
add interface name="Interno" disc=disable minint=7 maxint=10 life=30 level=0
popd
# ----------------------------------
# Configuraci¢n de asignador DHCP
# ----------------------------------
pushd routing ip autodhcp
uninstall
popd# Fin de configuraci¢n de asignador DHCP
# ------------------------------------
# Configuraci¢n de puente (no compatible)
# ------------------------------------
# ------------------------------------
# Final de la configuraci¢n del puente
# ------------------------------------
Here is the end of the example file ******

Following the purpose of my example, I have changed the ip address parameter painted in the above script (mark as blue font), then after saved that, and finally in order to update that configuration, run next command :

netsh exec C:\IpConfiguration.txt

Remember, this procedure is available too into "YouTube Videos hosted by German Medina -at the right side of this page-), like as the next video :

Iperf : Measuring your bandwidth (2)

germanmedinavirtual@gmail.com (German Medina Neria) — Fri, 29 Feb 2008 01:56:00 +0000

Product : Iperf
Part Involved : Measure of Bandwidth
Summary: When the answer of the command "ping" is not continue and you find a bouncing link then it is necessary to establish how is your bandwidth working.
Scenario : The delayed conecction inserted into LAN connection has a big impact on your LAN company.
Company : The National Cancer Institute of Peru (INEN).
Reference Date : February 2008.

That is in the case when your company has limited resources and there is no possible to hire some contractor to troubleshooting the event occured linked to LAN trouble. The another point is to share all the stages into LAN conecctions between : structured cabling, switching equipment and every other device connected into the path of the trace of your command "ping". That is, follows the trace of the signal locating the source and target place to test the connecction of that band width .

Additionally, the answer of the comand "ping" has its own limitation when the answer is not continuos, in that case how can you determine the source of the problem, that is focusing on the measure of the bandwidth of that segment of LAN.

Here, you will find an interesting video captured http://www.youtube.com/watch?v=oPWMgZ8mMng about two measures did (and the process involved) at the same time on the same screen, reading values of the how the Server is looking that link and how Client is looking the same link.

Installing Red Hat over VmWare

germanmedinavirtual@gmail.com (German Medina Neria) — Thu, 21 Feb 2008 21:19:00 +0000

Product : Linux
Part Involved : Red Hat
Summary: Installation of Red Hat Linux distribution.
Scenario : The installation procedure has been installed over virtual Machine (using VmWare).
Company : owner.
Reference Date : February 2008.

The overall procedure to install Red Hat over VmWare has been uploaded into next links :
Part 1 : Http://www.youtube.com/watch?v=x6MpBPIVqho
Part 2 : http://www.youtube.com/watch?v=mjCHSBK2lEw
Part 3 : http://www.youtube.com/watch?v=_nd3brZC86A
Part 4 : http://www.youtube.com/watch?v=Oa_wphK8MW0

Relax, if your bandwidth or your hardware does not permit check the videos, then send me an e-email and I will replay you with the videos or in the last instance I would up load in some server with access in internet to download that files.

Troubleshooting LAN connections

germanmedinavirtual@gmail.com (German Medina Neria) — Mon, 21 Jan 2008 23:37:00 +0000

Product : Links connections are bouncing.
Part Involved : LAN
Summary : The purveyor has installled three new data LAN ports close to magnetic resonance scanner
Scenario : Personnel of Computing office suspects about the field emitted of magnetic resonance scanner.
Company : The National Cancer Institute of Peru (INEN).
Reference Date : January 2008.

After the installation of the three LAN data ports the purveyor proceeded to testing the structured cabling related to these points and all of them passed successfully. That was a dark threshold to find the seed core of the problem. The simple tests did by personnel of computing office using the ping command throw that the connection was not solid, the time of response vary from time to time with not appearently some type of pattern related to it, then it started to suspects about the RF emitted of magnetic resonance scanner. The structured cabling was based on CAT6 and up to here there is no more evidences available to establish a technical diagnostic.

I have downloaded and installed a software tool to measure the bandwidth http://germanmedinavirtual.blogspot.com/2008/01/iperf-measuring-your-bandwidth.html between the LAN data port with problems and another pc at the other side of the networking structure -last one without problems-, then I begun to collect samples of connection between these two LAN data ports, one with the response time of the ping command and at the same time measuring the bandwidth using Iperf. Then the next video shows this process http://www.youtube.com/watch?v=mgKOd2eTLuU and the results gets while the software applications are executed querying to database , for example in this case the average of the bandwidth obtained reached 68MBits/Sec (too low).

Taking this reference it is clear way that there is a considerable loss detected into the link, the next step was to identify what device is causing this efffect and that was focused into some switch previous to the main switch close to telecommunication room; after it was replaced then the process to collecting samples from the link connection was repeated again such as I show at http://www.youtube.com/watch?v=xLiCfB8N06c reading a considerable differences of the bandwidth up to 93 MBits/Sec.

Here is, another case resolved.

Installing Panda Console

germanmedinavirtual@gmail.com (German Medina Neria) — Sat, 12 Jan 2008 02:57:00 +0000

Product : AntiVirus
Part Involved : Panda Console
Summary: The console does not download the agent and can not connect with the clients computers on LAN.
Scenario : There is a big range of clients computers without virus software updated .
Company : The National cancer Institute of Peru. (INEN)
Reference Date : January 2008.

I asked to purveyor to reinstall again the console application and they accepted my idea but they suggested too : Do not touch database antivirus plattaform or additionally instance related to it, then under the title "YouTube videos hosted by German Medina" with title "Installing Panda Console", you will find, the process filed. But this task does not resolved yet: (a) the download automation of the agent into console, (b) the update of the agent process in every client computer.

Iperf : Measuring your bandwidth (1)

germanmedinavirtual@gmail.com (German Medina Neria) — Sat, 05 Jan 2008 00:06:00 +0000

Product : Iperf
Part Involved : Measure of bandwidth
Summary: Into my LAN connections, I want to measure the bandwidth between two data ports of my LAN.
Scenario : Troubleshooting and detect what type of applications executed into pc spends more networking resources.
Company : The National Cancer Institute of Peru (INEN).
Reference Date : January 2008.

After several tries of testing then I recomend you this excelent tool to follow and measure your bandwidth between two LAN locations designated by you.

1.- The executable file can be downloaded on : http://dast.nlanr.net/Projects/Iperf/ and is free and there are available on all the range of exe file for every plattform base of operating system.
2.- Locate the two data ports to test and marked one as "Server" while the other as "Client".
3.- After downloaded the executable file, proceed to unzip and placed it on some carpet.
4.- At the Server side you should type next command to enable the listen task:
> Ipers -s

5.- Adding the next flags you can configure at the Server and Client sides :
-w (size of TCP windows)
-t (the frecuency to throw the results on screen)
-f (using results based on : KBits, MBits, KBytes, MBytes)
6.- Then at the Client side you can adjust the command like than :
> Iperf -c 10.10.25.24 -t 1 -f KBytes -w 300K
"Testing from Client pc to 10.10.25.24 with updates of row information every 1 second, using the format KBytes with 300K of buffer socket size. "

Video & Audio Streaming Concepts

germanmedinavirtual@gmail.com (German Medina Neria) — Mon, 03 Dec 2007 13:27:00 +0000

Product : Linux.
Part involved : Streaming Server facilities.
Summary : Clears the way how this technology works.
Scenario : It is part of a free training program taught by COS-PERU.
Company : Open Source Center of Peru (COS-PERU).
Reference date : December 2007.

There are several services such as : radio and tv looking the way to change the broadcast of its signal information and opens the way to access them from internet selecting web browser since your computer. That is integration of Radio&Tv using ip technology.

Radio & TV have use the same requirements to build it and these ones are :

1.- Spread Server
2.- Broadcast Client (Life)
3.- Bandwidth assigned

The techniques used to transmit audio and data (video) is named "streaming". Then the Spread Server (1) managements and emits the streaming signal to www. About the quantity of simultaneous connections supported is called "concurrence" and can be calculated by how do you spend the concurrence resource of Spread Server. Then, next, we find a few samples of needs required for every type of broadcast.

Audio 24Kbps for every user connected
Video 100Kbps for every user connected

Buffer of the Spread Server.- Initially this parameter is considered to program and save space to concurrence concept, check next example :

- If my computer (1.-) has 1G RAM conifigured with 8K Buffer RAM, how many users can be attended ?

Remember that 1G= 1024K, then 1024/8= 128 users or concurrence top value.
The widthband (3.-) used by these concurrence connections then is calculated such as follow for :

Audio = 24 x 128 users = 3,072Kbps
Video = 100x 128 users = 12,800 Kbps
At this point, It's clear how many bandwidth will be used or How can I adjust this resource according to the available of bandwidth of my provider (ISP).

Related to the software used by Spread Server (1.-), we find next software free application to fullfill with this purpose : ShoutCast, IceCast, StreamCast, while these applications assigned carpets into server to every audio and video files to share and save information.

The Broadcast Client (2.-) converts the analog signal into digital signal through video capturer card (video broadcast case) while the client computer (user placed in office or home connected through www) needs to support multimedia basically since the applications WinAmp, Real Player, Windows Media to connect to (2.-).

There is a video example attached to show (2.-) under main title "YouTube Videos hosted by German Medina" at the right bottom of this page and select title "Video Streaming Concepts" for more information.

Handing Fiber Optical Connectors

germanmedinavirtual@gmail.com (German Medina Neria) — Sat, 03 Nov 2007 03:58:00 +0000

Product : Fiber Optical Connector
Part Involved : SC connector
Summary: Procedure to prepare, weld with epoxy fiber optical connectors.
Scenario : Upgrading of Networking infrastructure.
Company : Minister of Health of Peru (MINSA).
Reference Date : November 2007.

I have uploaded an interesting video with the step by step to reach with this goal.
Check at the right-bottom side of this page under section "YouTube Videos hosted by German Medina" under title "Handing Fiber Optics Connectors" to watched my video uploaded.

Gutsy Gibbon Peru

germanmedinavirtual@gmail.com (German Medina Neria) — Sat, 27 Oct 2007 15:21:00 +0000

Product : Linux.
Part involved : Gutsy Gibbon.
Summary : Peruvian launch of Gutsy Gibbon.
Scenario : A set of conference given by Linux experts in this event into "Open Source Center of Lima Peru" .
Company : Open Source Center of Peru.
Reference date : October 2007.

It was a pleasure to find an optimistic group of people leadering Linux issue with no more advertisment than the own enthusiam spread by this team of Linux experts and I could see the information presented was fulfill with the best quality, the invited people asked all the question that they wanted while at the same time the presenter was answering without tire to take every issue taken into presentation. Next you will find www to contact them :

Open Source Center of Lima Peru http://www.cosperu.com/
Ubuntu Peru Team http://www.ubuntu-pe.org/

You will find an insteresting video captured about this event at the right-down side of my blog under title "You Tube Videos hosted by German Medina".

Panasonic D500

germanmedinavirtual@gmail.com (German Medina Neria) — Thu, 25 Oct 2007 20:36:00 +0000

Product : PBX
Part Involved : Panasonic D500
Summary: I gave a presentation about the basic concepts used in telephone systems
Scenario : The enviroment belongs to celebrate the anniversary of "Telecommunication Office of Maria Auxiliadora Hospital".
Company : Maria Auxiliadora Hospital of Peru (HMA).
Reference Date : October 2007.

At the right-down side of my blog, I have added an additional video about PBX founded in this visit "Panasonic D500 on HMA" and related about the presentation of the concepts taken were :

-E1 or Primary : It is a set of traffic channel grouped into the same physical connection, then there are 30 traffic channels and 2 signaling channel assocciated to this type of conecction. In the most of the cases the Telephone carrier provider install an end baloom containing the U-links connector into local client to establish the point connection to PBX with a 75 ohms (through the primary card). Every traffic channel is 64Kbps (like as signaling channel) but the process of compressed a traffic channel included in several PBX brands can modify the bandwidth of the traffic channel versus quality of the calling party.

-An introduction of extension technology used into PBX systems : analog, digital and IP handset phones; Analog extension can be swaped with telephone handset used into analog trunk conecctions, the bandwidth used is 64Kbps and it is possible set up a parallel conecctions to this terminal; related to digital extensions, these are closed linked to the brand of the PBX and signaling between them (PBX and extension) belong to propietary coding, anyway the additionally functions added to this type of terminal are placed to directors, Chiefs and supervisors into company, in this case is not possible to make parallel connections to this extension; about Ip extensions takes various concepts from digital extensions : Propietary addtional coding Protocols and suggest the importance of the structured cabling systems as main piece into implementation of this type of project, into PBX is inserted an Ethernet/Ip card to connect from PBX to structured cabling, the concept of mobility of the Ip extensions is introduced with this type of technology that should be balanced with others parameters such as QoS, domains of colissions, VLANs, degree of service, ratio compressed of traffic channel should be additional parameters to find the best performance with this type of communications established.

- The importance of calling management software in order to establish the scale of cost calling for every office and every trunk available installed into PBX , taking the way to clear what type of calling services are most used compared with others and fortify the weak devices connected or detect the failured devices that are not working properly with the capacity begun installed.

IEDS

germanmedinavirtual@gmail.com (German Medina Neria) — Fri, 28 Sep 2007 03:31:00 +0000

Product : IEDS (Standard Identification of Health Data).
Part Involved : Catalogs introduced: "Places Building of Health" and "Producing units of Health Services" .
Summary : Looking to join data health information between all producing units of health of the country.
Scenario : Presentation of the catalogs is focusing to share and join all the health information and trace a method to search a "key health data" from the overall health institutions of the country.
Company : Minister of Health of Peru (MINSA).
Reference date : September 2007.

September 27, 2007 at “El Condado” Hotel was the presentation of the Catalogs “Places Building of Health” and “Producing Units of Health Services”, these ones belongs to IEDS, through the benefits of the IEDS I can highlight : (1) implementation of the only Clinical History concept into Health departament of the country, (2) Drives the process into health sector of the goverment, (3) Implementation of National DataBase of Health, (4) Insurances services, Bank would access to health information to take decisions, (5) A programming of buy pack into health sector for goverment.

The Catalog “Producing Units of Health Services” proposes a new structure of producing units linked to their respective cost center and set up a new identification coding to every specialist of medicine associated to every cost center, such as clear way to interconect data fields between institutions.
In Reference of “Places Building of Health” catalog, it has been programmed “The National Record of Places Building of Health (RENAES)”, through a web interface every Health Institution in the country should be filled information related to its own institution and later the update information process should be responsible to every institution (administration) while the system generates an own code identification appended a new record to IEDS database then query information can be accessed by internal and external users. The manager assigned in charge is “The General Direction of Health of people (DGSP) of MINSA.

About this topic, I can add that MINSA has advanced into the first step of e-goverment services because focused on next objectives : (1) Main Health Database available, (2) Global Access to Health information, (3) The value added of health services can be programmed from this point (move patients, stock of medicine, global of trace of clinical history of patients in the entire country and so on).

I have added Videos related to this issue at the right side of the screen

Installing Ubuntu Linux over VmWare

germanmedinavirtual@gmail.com (German Medina Neria) — Wed, 26 Sep 2007 13:05:00 +0000

Product : Linux
Part Involved : Ubuntu
Summary: Procedure to install Ubuntu over VmWare
Scenario : I am using my Pc to work with xp and Ubuntu at the same time.
Company : Owner.
Reference Date : September 2007.

Follow next tips :

1.- Click on http://www.ubuntu.com/getubuntu/download and download your preference installation according to your requirements, at this topic I want to advanced to you that Server edition is not complete and later you will need to download additionally files to complete your installation. And about the type of computer that you have to select, check on "Standard personal computers" in 32 bits case.
2.- At the end of the download process you will find an iso file (image of installation).
3.- To test the iso file go to https://help.ubuntu.com/community/HowToMD5SUM and download MD5SUM exe file, after that install it, and execute on the same carpet location of your iso file:

4.- Set up the bootable device through http://germanmedinavirtual.blogspot.com/2007/10/virtual-machines.html and check point 5 to specify source bootable path to locate iso file.

Check an example of installation through "YouTube Videos hosted by German Medina" at the right side of the screen with the titles : "Installing Ubuntu over VmWare - part1 and part2".

Virtual Machines

germanmedinavirtual@gmail.com (German Medina Neria) — Wed, 19 Sep 2007 20:47:00 +0000

Product : VmWare
Part involved : Server Console.
Summary : Software to create "Virtual Machine" in your Pc.
Scenario : An easy way to test operating systems and several applications over different plattforms using the only and the same hardware available.
Company : Owner.
Reference date : September 2007.

You can install several operating systems and working with all of them at the same time (Windows Xp, Vista, Linux, and so on) using the same computer to achieve with this goal. Follow next tips :

1.- Go to http://www.vmware.com/download/server/

2.- Fill your personal information to get a free serial number.
3.- Click on "Download Now" button, then download and install.
4.- Click on Edit/Preferences/Input and check the options "Grab keyboard and mouse input on mouse click", "Grab keyboard and mouse input on key press"
5.- To set up bootable device check "Edit virtual machine settings" and select CD-ROM and the source device of the boot process like as picture below :

The complete process of installation is available at the right side of the screen under title "Installing VmWare" on "YouTube Videos hosted by German Medina "

Auditing report of Minister of Transport and Communications of Peru (MTC)

germanmedinavirtual@gmail.com (German Medina Neria) — Wed, 12 Sep 2007 22:03:00 +0000

Product : Auditing report.
Part involved : Minister of Transport and Communications of Peru (MTC).
Summary : Through this report MTC tryes to explain to peruavian citizens what happened when mobile phone communications and land phone communications crashed on August 15, 2007.
Scenario : That date our country was shaken by 2 consecutive earthquakes of 7.5º on Richter scale and after that the communication was lost upto 6 hours in main city (Lima) and several days near to the epicenter (Chincha and Ica -200 Kms south of Lima-).
Company : Owner.
Reference date : September 2007.

Today MTC has published the auditing report in http://www.mtc.gob.pe/portal/Informe%20Nº%20009-2007-MTC-29.pdf to achieve with next goals :

- To decide on capacity of Public Commute Branch Exchange.
- To decide if the capacity of traffic management system and the size of telecommunication networking are enough to attend the requirements of telephone communications of the suscribers.
- In the case of mobile phone service, look at the level of working of cells.
- An additional actions to be necessary.

While OSIPTEL has published two documents in : (1) http://200.89.2.171/Index.ASP?T=T&P=GCC%2FNOTICIAS%5FPUBLICACIONES%2FNOTAS%5FPRENSA%2FFILES%2FNP+Resultados+de+Comision+de+Alto+Nivel%2Epdf (2) http://200.8.92.171/Index.ASP?T=T&P=GCC%2FEL%5FSECTOR%2FNORMAS%5FOSIPTEL%2FFILES%2Fres%5FPD%2F2007%2Fres1232007PDOSIPTEL%5Finforme%2Epdf about the same subject.

The auditing report of MTC shows a delimited sections of every mobile phone operator. Next parameters are defined as : IC-TINE (attempt not connected), TTLI (callings fallen) and summary of them :

Nextel (Mobile phone carrier operator)
Cpu (qty) = 1
Cpu % = 67
IC-TINE = 3
TLLI = > 2
Subscribers= 390,000
Traffic Channels= 4,604
Users/Channel= 84.70

MoviStar (Mobile phone carrier operator)
Cpu (qty) = 6 MGW
Cpu % = 70
IC-TINE = 4.03 (April), 6.41 (May), 3.48 (June), 4.54 (July)
TLLI = (No information)
Subscribers= 7,637,504
Traffic Channels= 141,492
Users/Channel= 53.98

Claro (Mobile phone carrier operator)
Cpu (qty) = (No information)
Cpu % = 72 and 98
IC-TINE = (No information)
TLLI = (No information)
Subscribers= 4,521,412
Traffic Channels= 138,203
Users/Channel= 32.72

Telefónica (Land Line carrier operator)
Cpu (qty) = 5
Cpu % = 60
IC-TINE = (No information)
TLLI = (No information)
Subscribers= 2,340,000
Traffic Channels= (no information)
Users/Channel= (no information)

Telmex (Land Line carrier operator)
Cpu (qty) = (no information)
Cpu % = 43
IC-TINE = (No information)
TLLI = (No information)
Subscribers= 28,530
Traffic Channels= (no information)
Users/Channel= (no information)

In Claro's case the auditing report suggests an acceptable value of "Users/Channel" (32.72), while at the same time does not confirm the rest values indicated under the reference (no information) and clears the responsabilities between MTC and OSIPTEL (Telecommunication Supervisor Body) such as next table :

Duties of MTC
Supervision of implementation networking (first 12 months)
Fill goals of the spectrum.
Fill goals of secret of communications.

Duties of OSIPTEL
Check quality and efficiency in public telcommunications services.
Check the goals and obligation to expand services.
Check to fulfilling the contract as carrier operator.

In the auditing report of OSIPTEL, we can find :
-IC-TINE and TLLI superpassed 3% in MoviStar, Claro and Nextel since previous months ago to earthquake.
- It founded 807,900 callings lost at peak hour (it is an abuse!)
- Most of calling cases are GoS are 1%.

I am going to suppose that :
(a) The quantity of traffic channels busy in Lima reachs up to 70,476 (assumed only 55% from the overall) multiply by 300 minutes, and every one minute had a cost average of S/.050, then the big business for MoviStar was for that event (after earthquake) the profit of S/. 10'571,400 ( US$ American Dolar 3,410,129.00).
(b) But I am going to give to MoviStar the benefit of the doubt according to the previous paragraph : only the half of the overall traffic channels made (dial) the call becuase the other half received the call, then the profit is US$ 1,705,064.00).
(c) There is no any rule and local law to establish the maximum ratio and relation to the parameter "Users/Channel", that is, if the carrier operator exceeds that parameter then this one should be forbidden to sell additional mobile phones. -You want to sell more mobile phones then first build the networking wireless to use-.
(d) The end user at the time of buying a new mobile phone should be noticed about the available traffic channels and another networking resources offered by carrier operator.
(e) The advertisment on news paper, tv and others medias to sell mobile phones should be included additionals indicators of quality of services and availability of networking services, that can be access too, by links of www.
(f) The auditing reports does not confirm an absence of call service and that means, that was a super plus of calling service?, and what happened with suscribers did not connect never at that time?. Both auditing reports confirm deficiency of planning networking telecommunications and degraded of call service but at this point the main reason of typing the auditing report was to confirm what suscribers were feeling at that day ?, is not explained what was the main reason calling services crashed on August 15.

Lost Internet

germanmedinavirtual@gmail.com (German Medina Neria) — Thu, 06 Sep 2007 15:56:00 +0000

Product : Linux.
Part involved : Squid.
Summary : Users can not access to internet.
Scenario : Troubleshooting internet service of end users .
Company : National Institute of Cancer Sickness of Peru (INEN).
Reference date : May 2005.

The main functionality of internet connection is based on "rcinetd" service running on Linux, then is possible to get up it swaping the states of that service, such as :

/etc/inetd.conf
rcinetd restart
cd /var/spool/mail
vdir
du -h
tail -f /var/log/mail
tail -f /var/log/httpd/access_log
tail -f /var/squid/logs/access.log
last more
vi /etc/passwd
bi /etc/shadow

And, after that, it persists a lost of internet service then try with ping command from your gateway to outside if there exists any other response, in negative answers check your connection with your ISP.

Checking Links of BTS

germanmedinavirtual@gmail.com (German Medina Neria) — Fri, 31 Aug 2007 15:44:00 +0000

Product : Motorola
Part involved : 9600.
Summary : To proceed to discard problems with link carrier then check spams.
Scenario : BTS is appearently oos.
Company : Motorola of Peru.
Reference date : June 1998.

Connect to BTS using ALMF :

Almf
c-Kermit
Login ILGIP :
You are already logged

disp param span
diap param edlc
/** Check values, these ones should be LVO=7 and Line Code=2 **/
Logout

Swap mmi cable to next GLI and repeat the procedure in all GLIs, after that check if the links are working with :

display emx link_status

WaveCom Q2426B

germanmedinavirtual@gmail.com (German Medina Neria) — Mon, 27 Aug 2007 21:25:00 +0000

Product : Wavecom.
Part involved : Q2426B.
Summary : Set up and configuration of wavecom card.
Scenario : Enable traffic channels of mobile phone call termination using wavecom card connect to PBX Alcatel.
Company : Minister of Health of Peru (MINSA).
Reference date : January 2007.

1.- Check cable DB9 to DB9 (pin to pin).
2.- Set up hyperterminal with next fields : 34800, N, 8, 1, N
3.-

Check as reference : http://germanmedinavirtual.blogspot.com/2007/08/calculate-traffic-channels-3.html