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Caio_178191's avatar
Caio_178191
Icon for Nimbostratus rankNimbostratus
Apr 09, 2015

tcpdump to monitor health monitors (GTM)

Hi,   I'm trying to get activity from GTM Health Monitor but tcpdump show me no activity. I set a tcp monitor in VS.   The command I'm typing is tcpdump -nni any host x.x.x.x   where x.x.x...
availability
BIG-IP DNS
monitor
TMOS
TMSH
gsharri's avatar
gsharri
Icon for Altostratus rankAltostratus
Apr 09, 2015

The GTM itself might not actually be running the monitor. If you have other BIG-IPs (LTMs, GTMs) created as server objects in the GTM config any one of them might be running the monitor at any given time by default. The preferred method, if possible, is that the monitor will be executed by a BIG-IP in the same datacenter as the server/virtual server that is being monitored. Also, GTM will rotate the monitor assignment periodically among all available BIG-IPs. See these AskF5 articles for more info:

 

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