Fourteen Forty And Fourteen Twenty Eight
A host on an Ethernet link with a 1500-byte MTU opens a TCP over IPv6 connection and enables the TCP timestamps option, which occupies 12 bytes (10 bytes of option plus 2 of padding) in every data segment. RFC 6691 says the MSS option value is derived from the MTU minus the fixed IP and TCP headers, with no adjustment for options, and that the sender must separately shrink its payload to make room for options it actually sends.
What MSS does this host advertise, and what is the largest payload it can put in one segment?
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