[e2e] Question on MTU

Bob Braden braden at ISI.EDU
Thu Apr 21 13:55:26 PDT 2005

  *> But the advertised MSS in the TCP MSS option should not be adjusted to 
  *> reflect any options or intermediary headers, just the fixed IP and TCP 
  *> header sizes; 40 bytes for IPv4/TCP, and 60 bytes for IPv6/TCP.  When 
  *> the sender generates the packet, he is responsible for reducing the TCP 
  *> data to allow room for any additional options or headers.
  *> 			-David Borman


Please see Section of RFC 1122 "Requirements for Internet
Hosts - Communication Layers" for the details.

Bob Braden

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