I recently wrote a document on http://jon.spriggs.org.uk/blog explaining how to monitor the interface of a McAfee sidewinder to see when it failed over. I don’t know why I didn’t write it on Posterous, but if you’re following me on Posterous, and you think that you might want to know how to use Perl to repeatedly loop over the same command, and show the results with a date stamp underneath it (a bit like the watch command) then you’ll find this page really useful. In the mean time, I’ve also written the same script for the CSH shell, which is used, amongst other places, on Nokia Firewalls.
Introduction
One of our requirements with one of our customers is to perform regular and routine failover tests. As the interface is not responsive to providing information about when service has failed from Primary to Secondary and back again, I re-wrote the script I adjusted for McAfee Sidewinders to run on the SECONDARY NODE to show the interface address of one NIC every 5 seconds. I’ll also show how to slightly modify the script with different time delays and interface names. Please note, there may be much better ways of doing this. I needed something in a hurry, and this gave me what I needed. If you’ve got any better ideas, please drop me a note at jon@spriggs.org.uk or note below how to do it :)
Steps to perform
while (-e /bin/csh)
ifconfig eth-s1p1c0 | grep inet
date
sleep 5
end
inet mtu 1500
inet 1.2.3.4/24 broadcast 1.2.3.255
inet 1.2.3.5/24 broadcast 1.2.3.255 vrrpmac 0:0:aa:bb:cc:dd
Tweaks
In the bold section above, replace the interface name identified (here it’s eth-s1p1c0) with an interface you know will fail over, you can also make bigger or smaller the sleep command – here it’s 5 seconds, but there’s probably no reason why it couldn’t be 1 or 10.
