Forum Discussion

Altostratus

Aug 23, 2016

iRule for directing traffic to an alternative GSLB pool based on the LDNS IP

Hi;

I have a DNS wideip with two Pools. I want to put an iRule where as if the source IP of the user's LDNS is not within subnet 10.0.0.0/8 then Pool2 is chosen. I want to bind this iRule to the wideip. Can you please suggest a syntax for this iRule.

Kindly Wasfi

application delivery

BIG-IP DNS

cloud

2 Replies

Stanislas_Piro2

Cumulonimbus

Aug 23, 2016

This irule is one I use to answer with different pool based on source address:

F5 GTM : Split dns irule

when DNS_REQUEST {
  if { [IP::addr [IP::remote_addr] equals 10.0.0.0/8] \
     or [IP::addr [IP::remote_addr] equals 192.168.0.0/16] \
     or [IP::addr [IP::remote_addr] equals 172.16.0.0/12] } {
    pool "[DNS::rrname]_PRIV"
  }
}

The internal pool name must be:

_PRIV

Stanislas_Piro2
Cumulonimbus
Aug 23, 2016
Hi,

when you created (I hope you did) the GTM listener, there is no gtm object created but a virtual server with dns profile that enable GTM and allow irule usage.