“verify end-to-end connectivity”

I love it when the practice labs say “verify end-to-end connectivity”. Yes, this means we must be able to ping everything. There is no way we have time to ping every IP in the lab manually. I’ve started using TCL scripts to do so. See below.

Just paste this in your router (edit the IP addresses) and you’re good to go::

tclsh
foreach address {
192.168.4.4
192.168.5.5
192.168.6.6
192.168.7.7
192.168.8.8
192.168.9.9
} { ping $address re 3 si 100

I set it to ping 3 times with a size of 100 bytes. Keep the size small so the serial links don’t slow you down. I think 3 pings is enough time for ARP to do its thing. Take 10 minutes to write down all the interface/loopback IP addresses and this will save you some time. Don’t forget to test on all routers. Also, I don’t think switches support TCL.

This entry was posted on June 17, 2008 at 5:30 pm and is filed under Routing&Switching. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response or trackback from your own site.

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