[RESOLV::lookup] How flush the cache ?

can you try to set tmm.resolv.cachesize zero?

[root@ve11a:Active:In Sync] config  tmsh list sys db one-line|grep tmm.resolv
sys db tmm.resolv.cachesize { value "8192" }
sys db tmm.resolv.retry { value "3" }
sys db tmm.resolv.timeout { value "5" }

It'll depend on how you call RESOLV::lookup, but here's an example that's worked for me. Establish global variables and use them to determine when the last lookup was. Takes the current time on the LTM in seconds and checks if the last lookup was done within the last 30 seconds

 

 

when RULE_INIT {

 

set last_dns_request 0

 

set static::cache_dns 30

 

 

if { [clock seconds] - $::last_dns_request > $static::cache_dns } {

 

set ::last_dns_request [clock seconds]

 

set ips [RESOLV::lookup @8.8.4.4 www.google.com]

 

}

 

}