Maximum Segment Size

• MSS is the largest block of data that TCP will send to either end

• Each side must announce a MSSMSS appears in the SYN segment

• MSS size is calculated asMSS = MTU - ( fixed size of a TCP header + fixed size of IP header )

• BSD implementations requre that MSS = x*512 bits

• If the destination is non-local, MSS = 536

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