> No, the minimum MTU is a requirement on links, not hosts. Hosts are > always allowed to send smaller packets than the MTU if they want > to. Also, the MSS includes TCP options, so it might be 1208 on a > 1280-byte link.
There are conflicting RFCs, but the consensus seems to be the MSS is computed using the minimum size IP and TCP headers (without options). If a host sends packets with options, it is expected to count those against the packet size it sends. http://tools.ietf.org/html/rfc2460#section-8.3
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