Vyatta Network OS Documentation

Learn how to install, configure and operate the Vyatta NOS, which helps drive our virtual networking & physical platforms portfolio.

TCP MSS clamping

TCP MSS clamping is a process where network devices rewrite the MSS value in TCP handshakes.

Figure 1. TCP MSS clamping example diagram. A 24-byte GRE header added to a packet. In this case, TCP MSS should be clamped to 1436.