Forum Discussion

mika

Cirrus

Aug 17, 2020

Cookie

Hello,

There are cokies to know which backend server we are on with big ip v 14 ?

Best regards,

Hello Mika.

You can use an iRule to inject a HTTP header with this info.

when SERVER_CONNECTED {
    set node [IP::remote_addr]
}
 
when HTTP_RESPONSE {
    HTTP::header insert {LB-SERVER} $node
}

# curl -v http://10.130.4.50 -o /dev/null
...[Omitted]
HTTP/1.1 200 OK
< Date: Tue, 18 Aug 2020 08:18:42 GMT
< Server: Apache/2.2.15 (CentOS)
< X-Powered-By: PHP/5.3.3
< Content-Length: 7677
< Connection: close
< Content-Type: text/html; charset=UTF-8
< LB-SERVER: 172.16.1.2

Regards,

Dario.

Dario_Garrido
MVP
Aug 17, 2020
Hello Mika.

If you use cookie persistence, you can force a specific node for being selected in the loadbalancing method.
REF - https://support.f5.com/csp/article/K6917

Regards,
Dario.
- mika
  Cirrus
  Aug 18, 2020
  Thanq u for your anser :) but me i want return the ip of node not encrypt, this just for same ip for the devlopper and the project manager for theirs tests the load balancing.
  
  This fonctionnality of the cookie persistence it's the vulnérabily for systeme big ip https://www.nooby.fr/hacking-f5-persistence-cookie/.
  
  Regards,
  - Dario_Garrido
    MVP
    Aug 18, 2020
    Hello Mika.
    You can use an iRule to inject a HTTP header with this info.
    when SERVER_CONNECTED { set node [IP::remote_addr] } when HTTP_RESPONSE { HTTP::header insert {LB-SERVER} $node }
    # curl -v http://10.130.4.50 -o /dev/null ...[Omitted] HTTP/1.1 200 OK < Date: Tue, 18 Aug 2020 08:18:42 GMT < Server: Apache/2.2.15 (CentOS) < X-Powered-By: PHP/5.3.3 < Content-Length: 7677 < Connection: close < Content-Type: text/html; charset=UTF-8 < LB-SERVER: 172.16.1.2
    Regards,
    Dario.