Persist profile using XFF to read client IP address

Hi ant77,

You can try below one (please do not forget to change port_number to listening port on your backend server):

when HTTP_REQUEST { 
  set clientip [lindex [ split [lindex [HTTP::header values X-Forwarded-For] 0] "," ] 0]
  if {[HTTP::header X-Forwarded-For] != "" && $clientip equals "200.200.200.200" } then {
      persist uie $clientip
      node 10.10.10.11 port_number
  } else {
      persist uie [IP::client_addr]
      pool AppServer123
  }
}

https://clouddocs.f5.com/api/irules/node.html

If you also need to persistence based on XFF other than 200.200.200.200, you should modify the irule.