iRule which strips of the domain name and replaces that with another domain name.

Using string map :

when HTTP_REQUEST {
    if { [HTTP::host] contains "xyz.externaldomain.com" } {
        set new_host [string map {externaldomain internaldomain} [HTTP::host]]
        HTTP::header replace Host $new_host
    }
}

hey Yann....thanks a ton. I think the logic should work. However, we would like to use the new domain to do a lookup and what ever is the IP returned use that IP address in the node to forward the traffic.

Let me work on some extension of iRule with the logic you provided

This is the iRule that I have mapped out, still does not work. :( any comments?

when HTTP_REQUEST { if { [HTTP::host] contains "externaldomain.com" } { set new_host [string map {externaldomain internaldomain} [HTTP::host]] set ips [lindex [RESOLV::lookup -a [$new_host]] 0] node $ips [TCP::local_port] } }

Hi,

Are you sure that you resolve the new_host ?

when RULE_INIT {
    set static::dns "1.1.1.1"
}

when HTTP_REQUEST {
    if { [HTTP::host] contains "externaldomain.com" } {
        set new_host [string map {externaldomain internaldomain} [HTTP::host]]
        set ips [lindex [RESOLV::lookup @$static::dns -a $new_host] 0]
        node $ips [TCP::local_port]
    }
}

thanks again Yann... to ensure that DNS is not causing a issue I have put the hostname as a static host entry on the F5 itself.

Interesting approach. You use

[RESOLV::lookup]

[RESOLV::lookup]

Cheers, Kai

yes, it does seem that DNS is messgin up something here. I have commented the same below. Again, I would not know how to set the IP of the node with iRule. :(

any comments there are well? Sorry for the bugging but trying to get the familiarity.

The DNS is just not responding. The queries resolve correctky when I do a lookup from the Linux Kernel and the TMSH. Could there be anything different the iRule needs?