Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Chris_Grabill_2's avatar
Chris_Grabill_2
Icon for Nimbostratus rankNimbostratus
Dec 19, 2016

Help setting the mss on the client side conenction with an irule

I am trying to set the mss on the client side connection to different sizes based on source ip. I have read that you cannot choose the TCP profile with an irule but with 11.6 you can use the TCP::set...
application delivery
irules
Ed_Summers's avatar
Ed_Summers
Icon for Nimbostratus rankNimbostratus
Dec 20, 2016

CLIENT_ACCEPTED doesn't 'fire' until after the TCP connection has been established (the handshake completed). MSS is advertised as part of the SYN packet from each host - so set before that iRule would go into effect. I'm not sure what iRule event should be used for this - I'm doing a little digging as I'm curious also.