Path: utzoo!attcan!uunet!hsi!stevens From: stevens@hsi.UUCP (Richard Stevens) Newsgroups: comp.protocols.tcp-ip Subject: UDP max datagram size ? Keywords: UDP Message-ID: <170@hsi86.hsi.UUCP> Date: 21 Sep 88 20:14:04 GMT Organization: Health Systems Intl., New Haven, CT Lines: 18 Is there an agreed upon max datagram size for UDP packets ?? I couldn't find one in RFC 768. In looking at the systems I have access to, I see the original 4.3 BSD had a 9,000-byte limit on transmit which was then reduced to 2,048 with the 4.3 network updates from Berkeley a few months back. The PC RT under AIX has a 512-byte limit, while the IBM mainframe version (FAL) allows up to 2,048. I'm aware of the performance penalties once you exceed the network's MTU, but I was wondering if there was a generally agreed upon maximum (I'll guess there isn't). As I recall from a few years ago, isn't this the reason the BSD rwhod packets have a built in limit of information on up to 41-users. Richard Stevens Health Systems International, New Haven, CT stevens@hsi.uu.net ... { uunet | yale } ! hsi ! stevens