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f5mkuDefault's avatar
f5mkuDefault
Icon for Cirrus rankCirrus
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...
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
Daniel_Wolf's avatar
Daniel_Wolf
Icon for MVP rankMVP

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.