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Forum Discussion

Kmussa_164917's avatar
Kmussa_164917
Icon for Nimbostratus rankNimbostratus
Dec 20, 2015

GTM Private to Public Translation

I have a GTM in DMZ using private IP addresses for wide IP. I need to translate the 1st three octets of the wide IPs to public addresses. I believe I have to use an irule to accomplish this. I tried ...
application delivery
iRules
LTM
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Dec 21, 2015

Hi Kmussa,

customized Hamish Marson's "GTM traslation" iRule for you needs...

Original iRule can be found here: https://devcentral.f5.com/wiki/iRules.GTM-Translation.ashx

when DNS_RESPONSE {
    foreach rr [DNS::answer] { 
        if { ([DNS::type $rr] eq "A") } then {
            if { [IP::addr [DNS::rdata $rr] equals 10.10.10.0/24]) } then {
                log -noname local0.debug "DNS Rewrite: [DNS::rdata $rr] > 1.1.1.[getfield [DNS::rdata $rr] "." 4]"
                DNS::rdata $rr "1.1.1.[getfield [DNS::rdata $rr] "." 4]"
            } elseif { [IP::addr [DNS::rdata $rr] equals 20.20.20.0/24]) } then {
                log -noname local0.debug "DNS Rewrite: [DNS::rdata $rr] > 2.2.2.[getfield [DNS::rdata $rr] "." 4]"
                DNS::rdata $rr "2.2.2.[getfield [DNS::rdata $rr] "." 4]"
            }
        }
    }
}

Note: I don't have a GTM to my hands, hope it will work out... 🙂

Cheers, Kai