TCP MSS adjustment

The TCP protocol negotiates a maximum segment size (MSS) value during session connection establishment between two peers. The MSS value negotiated is primarily based on the MTU of the interfaces to which the communicating peers are directly connected to. However in the network, due to variation in link MTU on the path taken by the TCP packets, some packets which are still well within the MSS value may be fragmented when the concerned packet's size exceeds the link's MTU.