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TCP MSS (Maximum Segment Size) is a parameter that controls the maximum amount of data that can be sent in a single TCP segment. It specifies the maximum size of the TCP payload, excluding the TCP header and any IP or Ethernet headers.
In MikroTik routers, the «change tcp mss» command is used to modify the TCP MSS value for outgoing TCP packets. This command can be useful in situations where the default MSS value needs to be adjusted to improve network performance or to overcome issues with Path MTU Discovery (PMTUD) in certain networks.
By changing the TCP MSS value, routers can prevent fragmentation of TCP packets and ensure that the packets fit within the maximum transmission unit (MTU) size of the network. This can help to avoid performance degradation and reduce the likelihood of packet loss or retransmissions.
The «change tcp mss» command in MikroTik routers allows administrators to set a specific MSS value for outgoing TCP packets on a per-interface basis. This can be done using the following command syntax:
`/ip firewall mangle add action=change-mss chain=forward new-mss= out-interface= protocol=tcp tcp-flags=syn`
Here, `` represents the desired MSS value, and `` is the name of the outgoing interface where the MSS value needs to be changed.
By adjusting the TCP MSS value, network administrators can optimize the performance and reliability of TCP connections in their MikroTik router networks.