GTM DNS REQUEST

This iRule uses data groups and should allow you some more flexibility going forward, if you wish to add more domains. This will require you to create two data groups (string type is fine) in order for this to work:

dotuk_group (include gcsx.gov.uk and gsi.gov.uk domains)

nhs_group (include nhs.uk domain)

This iRule should work for you:

when DNS_REQUEST {
    DNS::question name [string tolower [DNS::question name]]
    if { [class match [DNS::question name] eq dotuk_group] } {
            DNS::disable all
            pool pool1
    }
    elseif { [class match [DNS::question name] eq nhs_group] } {
            DNS::disable all
            pool pool2
    }
    else {
            DNS::disable all
            pool default_pool
    }
}

Thanks for the IRule, just one question what does DNS::disable all do ?

Hi Cosby,

I can't get the wildcard to match, I'm running Ver 11.5 and the only way I can get any match within the Data Group is to have the exact same thing; mail.gcsx.gov.uk (have that in the Data Group would get a match) but having *.gcsx.gov.uk would not match mail.gcsx.gov.uk ??? I can't see what I'm doing wrong.

Hope you can help.................

DNS::disable all just prevents any further processing of DNS (GTM, ZoneRunner), since you're forwarding the query somewhere else for resolution.

Instead of an exact match, the iRule can be modified to match for "ends with". Like this:

when DNS_REQUEST {
    DNS::question name [string tolower [DNS::question name]]
    if { [class match [DNS::question name] ends_with dotuk_group] } {
            DNS::disable all
            pool pool1
    }
    elseif { [class match [DNS::question name] ends_with nhs_group] } {
            DNS::disable all
            pool pool2
    }
    else {
            DNS::disable all
            pool default_pool
    }
}

So there's no need for you to put the wildcard FQDN in your dotuk_group. Just put it in as gcsx.gov.uk and the ends_with will match anything of that domain or any sub domains.

Cheers Cory it work's great now,

Many Thanks