IP TCP adjust-mss issue on 4500x

[Ebrahim]

I have a Cisco 4500x-32SFP with ios cat4500e- Universal K9.SPA.03.11.04.E.152-7.E4 and i have a tunnel in my 4500x. my incoming traffic is from Tunnel interface and outgoing traffic is from TE 1/15 and problem is that my user can not browse the website and a few others protocols so I use "IP tcp adjust-mss 1400" on my tunnel interface but it seems it does not adjust the TCP-MSS. i have also use "IP tcp adjust-mss 1400" on TE 1/15 but it did not work.

any idea how to solve this?

[pman]

Hi Ebrahim,

Maybe it's a fragmentation issue,
You may want to try working according to the following guide:

https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/13725-56.html

[Joseph W. Doherty]

Don't know if it applies to what you've been doing, but the TCP adjust-mss only works during TCP session setup.  I.e. if you activate the command, and the TCP session was already active, it has not effect.  Also, if there other path that would all the TCP session to set up, w/o going via an interface with this command, same issue.  (The latter often happens when a tunnel is used for a backup path.)

[Elliot Dierksen]

When I have used this command, it has always been on an interface with an IP address assigned. I am wondering if the OP is trying to put the command on a switch port that isn't an IP port, and is thus only operating at layer 2. That command only applies when the packets hits that interface at layer3.

[Georg Pauwen]

Hello,

for better understanding, post the running config of your 4500 (sh run)...