RFC 2147 (rfc2147) - Page 3 of 3
TCP and UDP over IPv6 Jumbograms
Alternative Format: Original Text Document
RFC 2147 TCP and UDP over IPv6 Jumbograms May 1997
Urgent field is set to 65535 to indicate that the Urgent Pointer is
beyond the end of this packet. The second piece can then be sent
with the Urgent field set normally.
Note: The first piece does not have to include all of the data up
to the Urgent Pointer. It can be shorter, just as long as it ends
within 65534 bytes of the Urgent Pointer, so that the offset to
the Urgent Pointer in the second piece will be less than 65535
bytes.
For TCP input processing, when a TCP packet is received with the URG
bit set and an Urgent field of 65535, the Urgent Pointer is
calculated using an offset equal to the length of the TCP data,
rather than the offset in the Urgent field.
It should also be noted that though the TCP window is only 16-bits,
larger windows can be used through use of the TCP Window Scale option
[Jacobson92].
4. Security Considerations
There are no known security issues involved in these changes.
5. References
[Jacobson92] Jacobson, V., R. Braden and D. Borman, "TCP Extensions
for High Performance", RFC 1323, LBL, ISI and Cray Research, May
1992.
[Deering95] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", RFC 1883, Xerox PARC and Ipsilon Networks,
December 1995.
Author's Address
David A. Borman
Berkeley Software Design, Inc.
4719 Weston Hills Drive
Eagan, MN 55123
Phone: (612) 405-8194
Mailing List:
Email:
Borman Standards Track