From owner-freebsd-questions Mon Jun 26 17:24:26 1995 Return-Path: questions-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id RAA25693 for questions-outgoing; Mon, 26 Jun 1995 17:24:26 -0700 Received: from alpha.xerox.com (alpha.Xerox.COM [13.1.64.93]) by freefall.cdrom.com (8.6.10/8.6.6) with SMTP id RAA25686 for ; Mon, 26 Jun 1995 17:24:23 -0700 Received: from crevenia.parc.xerox.com ([13.2.116.11]) by alpha.xerox.com with SMTP id <14456(2)>; Mon, 26 Jun 1995 17:23:44 PDT Received: from localhost by crevenia.parc.xerox.com with SMTP id <49860>; Mon, 26 Jun 1995 17:23:39 -0700 X-Mailer: exmh version 1.6.1 5/23/95 To: brian@mediacity.com (Brian Litzinger) cc: freebsd-questions@freebsd.org Subject: Re: broadcasting In-reply-to: Your message of "Mon, 26 Jun 95 13:49:40 PDT." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 26 Jun 1995 17:23:24 PDT From: Bill Fenner Message-Id: <95Jun26.172339pdt.49860@crevenia.parc.xerox.com> Sender: questions-owner@freebsd.org Precedence: bulk In message you write: >Could some kind soul point me to some docs on this broadcasting >stuff? You actually want to use multicast, not broadcast, as multicasts can go only to the machines that want them, and if you have multicast-capable routers your multicasts can cross subnets without an application-level gateway. You may want to look at the RTP spec, along with the MPEG profile, both available as Internet-Drafts from ds.internic.net:/internet-drafts : draft-ietf-avt-rtp-07.ps / draft-ietf-avt-rtp-07.txt draft-hoffman-rtp-mpeg-encap-01.txt You might have trouble if your MPEG codecs have no way to cope with loss, as for multicast applications you will need to use UDP. For such time-critical data as an MPEG stream, though, it doesn't make sense to try to be reliable; your decoder should just reset the codec at an appropriate point if it detects loss. Bill