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Forum Discussion

Sriram_87174's avatar
Sriram_87174
Icon for Nimbostratus rankNimbostratus
May 03, 2019

DNS irule for resolving FQDN with a IP - LTM

Hi All,   I have a request from the project to explore the option for the scenario below. VIP to be setup to listen on UDP 53 traffic The client sends a request with FQDN (there are 6 x...
application delivery
iRules
LTM
youssef1's avatar
youssef1
Icon for Cumulonimbus rankCumulonimbus
May 03, 2019

Hi.

If you want to use DNS in irule unsing LTM you must have necessary license (DNS Services license)

try this:

when DNS_REQUEST {

set host [DNS::question name]

  switch -glob $host {
    "hostname1.domain.com" { 
        DNS::answer insert "[DNS::question name]. 300 [DNS::question class] [DNS::question type] 1.1.1.1"
        DNS::return
    }
    "hostname2.domain.com" { 
        DNS::answer insert "[DNS::question name]. 300 [DNS::question class] [DNS::question type] 1.1.1.2"
        DNS::return
    }
    default {
        do nothing
    }
  }
}

let me know if you need more details.

regards,