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Why is MSS important? Why can't we just rely on the MTU?

The MTU is a local interface property. It is not signaled to communication partners.[*1] TCP exchanges the MSS between communication partners (it's an option but used commonly). [*1] You might argue ...
Zac67's user avatar
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3 votes

Why is MSS important? Why can't we just rely on the MTU?

What a host sees as the MTU may be completely different than what the host on the other end of a connection has for an MTU. When TCP creates a connection, there is the option to send to the other side ...
Ron Maupin's user avatar
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