Setting TCP MSS for an interface
The maximum segment size (MSS) option informs the receiver of the largest segment that the sender can accept. Each end announces its MSS during TCP connection establishment. If the size of a TCP segment is smaller than the MSS of the receiver, TCP sends the TCP segment without fragmentation. If not, it fragments the segment according to the receiver's MSS.
If you set the TCP MSS on an interface, the size of each TCP segment received or sent on the interface cannot exceed the MSS value.
This configuration takes effect only for TCP connections established after the configuration rather than the TCP connections that already exist.
This configuration is effective only for IP packets. If MPLS is enabled on the interface, do not set the TCP MSS on the interface.
To set the TCP MSS for the interface:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter interface view. | interface interface-type interface-number | N/A |
3. Set the TCP MSS for the interface. | tcp mss value | By default, the TCP MSS is not set. |