Forum Discussion

Cirrus

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
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

MVP

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