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Forum Discussion

Mike_Graston_10's avatar
Mike_Graston_10
Icon for Nimbostratus rankNimbostratus
Mar 21, 2007

Turning VS off when nodes down

All,     I am having an issue with Virtual servers staying up even when there are no no nodes on the back end up and running. I need to make the VIP address not availible when this event occur...
application delivery
dev
devops
iRules
StephanManthey's avatar
StephanManthey
Icon for Nacreous rankNacreous
Oct 23, 2014

Hi Felix,

in case you are using SNAT automap there is no need to disable ARP (and it is not even possible for egress floating self IP (which will be used here), afaik).

I remember having problems with the "selective" ICMP response settings after migrating to v11.5.1HF5 and picked just "enabled" (had the VIP in ARP and ICMP and generally disabled state before).

I just tested on v11.6.0 (no hotfix) and it seemed to work as expected: 
 tmsh modify ltm virtual-address 10.131.131.239 icmp-echo enabled
 tmsh modify ltm virtual-address 10.131.131.239 icmp-echo disabled
 tmsh modify ltm virtual-address 10.131.131.239 icmp-echo selective

Depending on chosen setting the ping to the virtual address worked / worked not. In case all pool members down in selective mode it stopped responding.

Is there an iRule associated with the virtual server referencing another pool? Can you please provide the configuration of your virtual server: 
 tmsh list ltm virtual <virtual_server_name>
 tmsh list ltm virtual-address <virtual_ip_address>

Thanks, Stephan