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- Path: sparky!uunet!spool.mu.edu!think.com!barmar
- From: barmar@think.com (Barry Margolin)
- Newsgroups: comp.protocols.tcp-ip
- Subject: Re: Does IP fragment broad/multicasts
- Date: 11 Sep 1992 22:58:11 GMT
- Organization: Thinking Machines Corporation, Cambridge MA, USA
- Lines: 20
- Message-ID: <18r8a3INNbi4@early-bird.think.com>
- References: <5653@ucsbcsl.ucsb.edu> <1992Sep11.205542.24508@noao.edu>
- NNTP-Posting-Host: telecaster.think.com
-
- In article <1992Sep11.205542.24508@noao.edu> rstevens@noao.edu (W. Richard Stevens) writes:
- >>We've been having an argument here concerning whether or not IP
- >>fragments broadcast and multicast packets.
- >
- >All the BSD kernel code that I've seen refuses to fragment a broadcast
- >packet. You get EMSGSIZE instead. I don't know about multicasting.
-
- I don't think there's anything in the IP specification that requires that
- fragmentation of broadcasts be refused. However, neither is there anything
- that requires that an IP implementation be able to fragment (they *are*
- required to be able to reassemble). So, an implementation may refuse to
- send a datagram larger than the interface MTU for any reason
- (non-implementation of fragmentation, destination address, configuration
- options, phase of moon, etc.).
-
- --
- Barry Margolin
- System Manager, Thinking Machines Corp.
-
- barmar@think.com {uunet,harvard}!think!barmar
-