Posts tagged network

Just Add Power

Just add Power Transmitter

Just add Power Transmitter


Les produits Just Add power sont des petits boitiers servant à distribuer un signal HDMI over IP.

Il y a pas mal de fonctionnalités notamment la Matrice pour faire des “Video Wall”, USB over IP etc.


C’est vraiment du très bon matériel. Si vous êtes interessé, contacté moi !







VTY access-class dans une VRF




Est-ce que vous avez aussi un problème pour mettre une access-list sur un accès SSH ou telnet d’un router qui se trouve dans une VRF ?





Comment faire alors ?

Il faut utiliser l’option vrf-also dans l’access-class in


Et voilà !




Nortel 8600 – Config NTP



This is the command to configure NTP server on a passport Nortel 8600



Cisco Tricks


Have an unsupported gbic module ?


Wireshark Filters



he filtering capabilities of Wireshark are very comprehensive. You can filter on just about any field of any protocol, even down to the HEX values in a data stream. Sometimes though, the hardest part about setting a filter in Wireshark is remembering the syntax! So below are the top 10 display filters that I use in Wireshark.


  1. ip.addr == [Sets a filter for any packet with, as either the source or dest]
  2. ip.addr==  && ip.addr== [sets a conversation filter between the two defined IP addresses]
  3. http or dns [sets a filter to display all http and dns]
  4. tcp.port==4000 [sets a filter for any TCP packet with 4000 as a source or dest port]
  5. tcp.flags.reset==1 [displays all TCP resets]
  6. http.request [displays all HTTP GET requests]
  7. tcp contains traffic [displays all TCP packets that contain the word ‘traffic’. Excellent when searching on a specific string or user ID]
  8. !(arp or icmp or dns) [masks out arp, icmp, dns, or whatever other protocols may be background noise. Allowing you to focus on the traffic of interest]
  9. udp contains 33:27:58 [sets a filter for the HEX values of 0x33 0x27 0x58 at any offset]
  10. tcp.analysis.retransmission [displays all retransmissions in the trace. Helps when tracking down slow application performance and packet loss]

Hot adding or removing a Cisco 3750 from a stack


When using a Cisco 3750 stack connected through stackwise technology you can add or remove a Cisco switch while the stack stays on. If you are adding or removing a switch from the stack, it is very important that the switch is turned OFF. The rest of the stack can keep doing its business.

For adding a switch to the stack follow these steps:

Step 1) On the new switch give the global command: switch stack-member-number provision type

Type is the type of switch you are adding to the stack.

When adding for example a third Cisco switch to the Cisco stack, use the following command:

switch 3 provision ws3750g-24t

Step 2) Power off the new stack member

Step 3) Connect the new member to the Cisco stack using the stacking cables, 1 loop at a time.

Step 4) Power on the new stack member. The switch will come alive and will receive the Cisco IOS version from the master, when that is completed it will be ready to service network requests.

For removing a member switch from the stack use the following steps:

Step 1) Power off the stack member to be removed.

Step 2) Remove the stackwise cable from the switch.

Step 3) Issue the following command on the stack master: no switch stack-member-number provisiontype

Cisco – Port mirroring


Voilà comment faire pour mirrorer un port:


Il est également possible de mirrorer un VLAN


Nortel CLI command guide troubleshooting


Here are the CLI commands for troubleshooting the ERS 8600 switch:


Config timezone

Config NTP server

Show log file




Cheat sheets: tcpdump and Wireshark


Voilà 2pdfs très intéressants. Ces documents couvrent l’utilisation de la commande tcpdumpen mode CLI. Le second document décrit les commande de Wireshark ( A noter que Wireshark sur base sur tcpdump)



Cisco IOS – Google power


Google power search

By the “Power of Google”, you can do anything and averything you want:-).

Juste copy paste this command to find IOS

or just click below



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