Replace server name

Hi Mr__T so you are just wanting to rewrite the Host header in the communication from client->BIG-IP->server, but not issue a redirect, correct? You can do that in an LTM policy or in an iRule.

Policy

ltm policy host_rewrite {
    last-modified 2023-09-19:14:47:44
    requires { http }
    rules {
        host_rewrite_all_traffic {
            actions {
                0 {
                    http-header
                    replace
                    name Host
                    value new.fqdn.com
                }
            }
        }
    }
    status published
    strategy first-match
}

iRule

when HTTP_REQUEST priority 500 {
    HTTP::header replace host "new.fqdn.com"
}

Note that this is not rewriting the location headers being returned from the server, and is assuming they are a) returning the original fqdn and b) are fine receiving a rewritten host. If that's the not the case, you'll need to do some more work. Post back with more details if necessary. HTH...Jason