Forum Discussion

dissapat's avatar
dissapat
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Jun 04, 2024

F5 cookie passive method

Hello, I am learning about F5 cookie persistence, and I have searched through many of posts.  I curious that when we use cookie passive method, how can F5 know that which client belongs to which ser...
cookie
LTM
persistence cookie
dissapat's avatar
dissapat
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Can we check that where F5 collect the information of cookie?

whisperer's avatar
whisperer
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Jun 04, 2024

Think you are missing the point of a passive cookie:

 

In Passive mode the Big-IP does not search or insert cookies into the HTTP header of responses from the server

  • dissapat's avatar
    dissapat
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    Jun 04, 2024

    Thanks whisperer i think i got it now.

     

  • dissapat's avatar
    dissapat
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    Jun 10, 2024

    But when client send traffic to F5, how F5 knows that which server that the traffic need to be sent?

    • c_fletcher's avatar
      c_fletcher
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      Jun 10, 2024

      Each server is configured to send the client a cookie that indicates which pool member to use for any further communication during the session. If the server is not configured to issue a cookie in the correct format, passive mode persistence will not work properly.

       

      The cookie uses the format detailed in this article: K6917: Overview of BIG-IP persistence cookie encoding