IP tcp adjust-mss does not

Hello

I setup ip tcp adjust-mss at 1200 on a router interface and when you make a packet trace I still see value MSS appearing as 1460 in the initial SYN packet.

The configuration is the following; I have a pc connected to a router on Fa0/0.  I placed the order 'adjust a segment tcp ip - mss 1200' in the configuration of the Fa0/0 interface.  This router then connects to another router.  I have a telnet from the host pc for the remote router, then the SYN passes through the router I lowered the MSS value on and it is not just changing.  I am using wireshark to check.  Am I missing something or is this supposed to tell the router to intercept packets SYN and change the MSS value?

Any help is very appreciated.

Sincerely,

David

Hi Dave,.

The SYN-ACK with MSS as 536 is planned. Most platforms use 536 default MSS. During the TCP 3 way handshaking, any side has small size that MSS will be used.

HTH,

Lei Tian

Tags: Cisco Security

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