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f5mkuDefault's avatar
f5mkuDefault
Icon for Cirrus rankCirrus
Apr 08, 2021
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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 before irule? or F5 will check the irule first?

 

TIA

application delivery
BIG-IP
LTM
  • Daniel_Wolf's avatar
    Daniel_Wolf
    Apr 09, 2021

    Take a look at this video from : https://youtu.be/qCLEw5xIZ7s

    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

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  • Daniel_Wolf's avatar
    Daniel_Wolf
    Icon for MVP rankMVP
    Apr 09, 2021

    Take a look at this video from : https://youtu.be/qCLEw5xIZ7s

    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
    • f5mkuDefault's avatar
      f5mkuDefault
      Icon for Cirrus rankCirrus
      Apr 14, 2021

      this is my same understanding, really depends on the event type used. Will check that video and visio file. Thanks Daniel.