TCP MSS does not applied on out-going packets

[revelation1048]

I found this comment and enabling offload gso,gro solved this issue.

MSS Clamping policy route not working as expected

Sorry for the delay, had something come up and couldn’t work on this for a day or two. I tried running the command you suggested, however it failed as I didn’t have any offload options set on the interface. Out of curiosity I tried enabling GSO & GRO offloading on the interface and now MSS is being adjusted properly per the config! I’m not entirely sure what combination of offload options I can/should be using, however considering this seems to have fixed my issue I’m inclined to leave it alone…

vyos@vyos1# show interfaces ethernet eth0 offload
 gro
 gso

Thank you so much to everyone who commented.