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Forum Discussion

Sylvain_Goulmy's avatar
Sylvain_Goulmy
Icon for Altostratus rankAltostratus
Apr 18, 2020

Set the same iRule on TCP and UDP VS

Hi all,   I have written an iRule that i'd like to deploy both on TCP and UDP VS.   To achieve that i have something in my code like :   set protocol [IP::protocol] set dest_port [expr {...
devops
iRules
LTM
ldesfosses's avatar
ldesfosses
Icon for Cirrus rankCirrus
Apr 21, 2020

I think you'll not be able to use UDP::something if your VS is not in FastL4 ( BIGPROTO ) or UDP. I understand it's not "normal" because UDP is not called if the VS is not in UDP.

 

When a VIP is configured in FastL4, it handle each packet, even for TCP, and a single packet.

 

https://support.f5.com/csp/article/K8082#l4

 

This is the only difference I see that can explain why it work in FastL4 and not in Standard. I suspect that to save memory, a VIP in TCP/Standard will not load all the event, UDP in your case. It's pure speculation tho.

 

 

 

  • Sylvain_Goulmy's avatar
    Sylvain_Goulmy
    Icon for Altostratus rankAltostratus
    Apr 23, 2020

    Thank you for your input.