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- Newsgroups: comp.protocols.tcp-ip
- Path: sparky!uunet!cs.utexas.edu!sdd.hp.com!ux1.cso.uiuc.edu!m.cs.uiuc.edu!zweig
- From: zweig@cs.uiuc.edu (Johnny Zweig)
- Subject: Re: UDP packet headers.
- Message-ID: <1992Aug25.202142.20819@m.cs.uiuc.edu>
- Sender: news@m.cs.uiuc.edu (News Database (admin-Mike Schwager))
- Reply-To: zweig@cs.uiuc.edu
- Organization: University of Illinois, Dept. of Comp. Sci., Urbana, IL
- References: <1992Aug18.140302.17177@bmers145.bnr.ca>
- Date: Tue, 25 Aug 1992 20:21:42 GMT
- Lines: 14
-
- macauley@bnr.ca (John MacAuley) writes:
-
- >If I have a maximum limit of 8192 bytes for a UDP packet,
- >how big can the user data be? Does the UDP header need
- >to be included in this maxsize?
-
- The limitation on maximum datagram size is determined by the implementations
- of UDP on both sides of the data transfer. I know that MacTCP limits you to
- 8192 octets of user data, and that the protocol limits you to 65535 minus the
- combined length of the IP and UDP headers (28, with no IP options present),
- but limitations on IP fragmentation/reassembly often make IP godzillagrams
- unusable. So the short answer is "it depends."
-
- -Johnny Header
-