Forum Discussion

Sumanta_88744's avatar
Sumanta_88744
Icon for Cirrus rankCirrus
Jun 09, 2016

Persistence profile - How will I use source address affinity based load balancing?

Hi Experts How will I use source address affinity based persistence profile across different pools having different IP but same port? For example there are two virtual server 1.1.1.1:80 and 2.2.2.2...
application delivery
BIG-IP
LTM
  • Yann_Desmarest_'s avatar
    Yann_Desmarest_
    Jun 11, 2016

    Don't worry, it's a common scenario for me.

    Just pay attention that the upstream proxy insert the "X-Forwarded-For" header, or maybe another one "True-Client-IP" or even "X-Client-IP".

    If you are just nating using a firewall, I think that the header is not inserted.

    I add this peace of code in the example :

     

    set clientip [IP::client_addr]

     

    because you may have situation where there is no "X-Forwarded-For" in the request, so that we can persist also in this scenario.

Vijay_E's avatar
Vijay_E
Icon for Cirrus rankCirrus
Jun 09, 2016

"Persistence" is about sticking to a common back-end pool. In your case, it is different pool member as the IP of the pool member is different. You can try to use Universal Persistence (UIE) with a specific hash value assigned to groups of pool members but it can get confusing. If you use the same back-end pool members, you can select "Match Across VS" within source IP based persistence.