Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 

Unable to access certain websites over the Internet through the router

Core issue

This problem can happen if the TCP sessions are being dropped.

When a host (usually a PC) initiates a TCP session with a server, it negotiates the IP segment size through the Maximum Segment Size (MSS) option field in the TCP SYN packet. The value of the MSS field is determined by the Maximum Transmission Unit (MTU) configuration on the host. The default MSS value for a PC is 1500 bytes.

Resolution

As a workaround, adjust the MSS value of the TCP SYN packets going through the router. In order to do this, issue the ip tcp adjust-mss command in interface configuration mode.

851
Views
0
Helpful
0
Comments