Ron, I proposed something like this a long time ago and called it "Report Fragmentation (RF)". I think that concept and name were also proposed an even longer time ago in the days of the pmtud wg back when RFCs 1063 and 1191 were under development in the late 1980's.
The thing is, applications that want to use steady-state fragmentation will not want to receive RF ICMP messages. And so, there should be some way for the sender to indicate to the receiver that an RF ICMP is desired. I think the way I proposed doing that was for the sender to set the evil bit in the IPv4 header and re-purpose that bit as the "RF bit". But, another way could be to include an indication at connection setup time at a layer above IPv4 (e.g., a TCP option). In any event, this idea has been kicked down the road before by myself and the earlier pmtud researchers. There are a number of details to concern yourself with including assumptions of the receiver's reassembly buffer size. I have quite a large stack of expired drafts on pmtud that you are welcome to examine to see what ground has already been covered. Fred > -----Original Message----- > From: Int-area [mailto:[email protected]] On Behalf Of Ron Bonica > Sent: Tuesday, October 29, 2019 9:53 AM > To: [email protected] > Subject: [Int-area] FW: New Version Notification for > draft-bonica-intarea-lossless-pmtud-00.txt > > Folks, > > Please review and comment. > > Ron > > > > Juniper Business Use Only > > -----Original Message----- > From: [email protected] <[email protected]> > Sent: Tuesday, October 29, 2019 11:48 AM > To: Ron Bonica <[email protected]>; Hakan Alpan <[email protected]>; Radon > Rosborough <[email protected]>; Bradely > Newton <[email protected]>; Miles President <[email protected]>; Manoj Nayak > <[email protected]> > Subject: New Version Notification for > draft-bonica-intarea-lossless-pmtud-00.txt > > > A new version of I-D, draft-bonica-intarea-lossless-pmtud-00.txt > has been successfully submitted by Ron Bonica and posted to the IETF > repository. > > Name: draft-bonica-intarea-lossless-pmtud > Revision: 00 > Title: Lossless Path MTU Discovery (PMTUD) > Document date: 2019-10-29 > Group: Individual Submission > Pages: 8 > URL: > https://tools.ietf.org/html/draft-bonica-intarea-lossless-pmtud-00 > > > > Abstract: > This document describes alternative IPv4 PMTUD procedures that do not > prevent IP fragmentation and do no rely on the network's ability to > deliver ICMP Destination Unreachable messages to the source node. > This document also defines a new ICMP message. IPv4 nodes emit this > new message when they reassemble a fragmented packet. > > > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at > tools.ietf.org. > > The IETF Secretariat > _______________________________________________ > Int-area mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/int-area _______________________________________________ Int-area mailing list [email protected] https://www.ietf.org/mailman/listinfo/int-area
