Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

dearsanky's avatar
dearsanky
Icon for Nimbostratus rankNimbostratus
Mar 10, 2016

Redirect the Nxdomain response

Hi, I've got one iRule to redirect the nxdomain response, but whenever i try it to my lab the rule does not work, please let me know if someone can give any idea on it. I want to redirect it to googl...
application delivery
BIG-IP DNS
irules
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Mar 11, 2016

Hi dearsanky,

 

you have to overwrite the DNS response code "NXDOMAIN" to "NOERROR".

 

when DNS_RESPONSE {
    if { [DNS::header rcode] eq "NXDOMAIN" } {
        DNS::header rcode NOERROR
        DNS::answer insert "[DNS::question name]. 60 [DNS::question class] [DNS::question type] 1.1.1.1"
    } 
}

Cheers, Kai