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f5mkuDefault's avatar
Apr 08, 2021

How does F5 process a traffic

Hi experts,   Wanted to ask as I keep having hardtime googling to find an answer.   How does F5 process a traffic when a client initiates? Does assume 3 way is completed, will F5 process SSL...
  • Daniel_Wolf's avatar
    Apr 09, 2021

    Take a look at this video from :

    It is for BIG-IP 12.1, but it is still relevant and very helpful.

    I watched it for like 45 minutes in Slow-Mo and replicated his drawing into a Visio. I attached my Visio as png.

    iRules are executed before, while and after the SSL handshake. Depending on the Event you choose.

    when CLIENT_ACCEPTED { ## happens when the TCP three-way handshake is completed successfully, before the SSL Handshake
    when CLIENTSSL_CLIENTHELLO { ## happens while the SSL Handshake
    when HTTP_REQUEST { ## happens after the SSL Handshake