RFC 4347 does strongly recommend avoiding IP fragmentation (which doesn't necessarily work all that great through broken middleboxes, and won't lead to good performance), but it does not forbid it.
Best regards, Pasi ________________________________________ From: ext Tim Evens [[email protected]] Sent: Wednesday, May 26, 2010 9:16 AM To: Eronen Pasi (Nokia-NRC/Helsinki) Cc: <[email protected]>; <[email protected]>; <[email protected]> Subject: Re: [Syslog] AD review discuss/comments for draft-ietf-syslog-dtls Interesting because RFC4347 IMHO states clearly that IP fragmentation (IP not UDP) must be avoided and thus dtls must determine the MTU. ** Sent from my tiny phone keyboard ** On May 25, 2010, at 11:03 PM, <[email protected]> wrote: > Tim Evens wrote: >> Correct, in RFC5426 the max size is 64K which is the max length in >> UDP. UDP sizes of greater than MTU are only achievable via IP layer >> fragmentation, as you also indicated. I'm under the impression that >> DTLS does NOT support IPv4 fragmentation since in RFC4347 it states >> in Section 4.1.1 "Each DTLS record MUST fit within a single >> datagram." > > AFAIK when running DTLS over UDP, "datagram" here refers to UDP > datagrams, not IP packets (and one UDP datagram can be split > to several IP packets). > > Best regards, > Pasi _______________________________________________ Syslog mailing list [email protected] https://www.ietf.org/mailman/listinfo/syslog
