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JG_249184's avatar
JG_249184
Icon for Altocumulus rankAltocumulus
Jan 18, 2018

persist source_addr

Hello,

 

I have question on understanding persistence source address on the F5. Does this apply to only when you create a session it will always maintain that session to the same backend node? Or every time you create a new session it will always go to the same backend node based on the client sending IP address? What I am seeing is the connection sometimes will go to a different server in the pool. I have it enabled using the default profile and also added it to my irule to troubleshoot with.

 

when HTTP_REQUEST { if { !([string tolower [HTTP::host]] equals "host.mydomain.com") } { reject } switch -glob -- [string tolower [HTTP::path]] { "/services/1.0/auth/" { pool pool-9061 persist source_addr } "/services/1.0/chat/" { pool pool-9062 persist source_addr } } }

 

application delivery
BIG-IP
LTM

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  • Prince_165600's avatar
    Prince_165600
    Icon for Nimbostratus rankNimbostratus
    Jan 18, 2018

    Connection attempt after the persistence timeout will be considered as a new connection instead of a returning connection. So in that scenario, your connection will load balanced as per the LB method.

     

    • JG_249184's avatar
      JG_249184
      Icon for Altocumulus rankAltocumulus
      Jan 18, 2018

      Thank you for the response. To follow up with that.. If I were to enable indefinite timeout on a new custom persistence sour_addr profile and the VIP learns the client IP address, will it always forwards it to the same backend server even with brand new connections from the same client IP?

       

    • Prince_165600's avatar
      Prince_165600
      Icon for Nimbostratus rankNimbostratus
      Jan 18, 2018

      It would not be recommended to have indefinite persistence timeout as it would eat up device resources.

       

      But to answer your question yes..