ltm rule event DNS RESPONSE

iRule(1)		      BIG-IP TMSH Manual		      iRule(1)



DNS_RESPONSE
       Triggered when the system responds to a DNS request.

DESCRIPTION
       Triggered when the system responds to a DNS request.

       When using this event in an LTM iRule on a DNS listener, either a GTM
       license or DNS Services addon license must be enabled. When using this
       event in an LTM iRule a DNS profile must be enabled on the listener.

Examples
	when DNS_RESPONSE {
	  if { [LB::server addr] equals "10.10.10.10" } {
	    log local0. "Alert: [DNS::rrname] resolved to backup server"
	  }
	}

	Change the ttl of all answer records and add a glue record

	when DNS_RESPONSE {
	    set rrs [DNS::answer]
	    foreach rr $rrs {
		DNS::ttl $rr 1234
	    }
	    set new_rr [DNS::rr "bigip3900-30.f5net.com. 88 IN A 1.2.3.4"]
	    DNS::additional insert $new_rr
	}

HINTS
       Note: This event triggers only in the context of LTM iRules.

SEE ALSO
CHANGE LOG
       @BIGIP-11.1.0 --First introduced the event in both LTM and GTM.



BIG-IP				  2017-01-31			      iRule(1)