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- Newsgroups: comp.protocols.tcp-ip
- Path: sparky!uunet!ukma!darwin.sura.net!udel!pervert!louie!daffy.cis.udel.edu!stewart
- From: stewart@daffy.cis.udel.edu (John Stewart)
- Subject: Re: TCP simul- & broadcast
- Message-ID: <1992Nov18.165707.3596@udel.edu>
- Sender: usenet@udel.edu (USENET News Service)
- Nntp-Posting-Host: daffy.cis.udel.edu
- Organization: University of Delaware
- References: <id.XP1V.B11@ferranti.com>
- Date: Wed, 18 Nov 1992 16:57:07 GMT
- Lines: 37
-
- In article <id.XP1V.B11@ferranti.com> ihsan@ferranti.com (jaleel ihsan) writes:
- >At one time class D IP address (224.0.0.0 thru 255.255.255.254) were
- >reserved for simul-cast and of course 255.255.255.255 for broadcast.
- >
- >I have a few questions reguarding TCP simul- and broadcasts, if
- >someone could please enlighten us:
- >
- >1. What do the latest standards demand from an implementor in this
- > regard.
- >
- >2. What happens to TCP's reliable delivery feature, specially
- > in case of broadcast ? Does it drop down to the level of UDP ?
- >
- >3. What are the vendors providing and supporting in the market place.
- >
- >I think I saw an article saying that some one has used TCP simulcast
- >for video teleconferencing (over ISDN perhaps) but I am not sure.
-
- At this point, multicast has been done at the IP-layer, rather
- than the TCP (or UDP) layer. For example, the Internet
- Engineering Task Force meeting, which is going on right now in
- Washington, D.C., is having some of its meetings video and
- audio mutli-cast over the Internet; applications with such huge
- bandwidth demands have, to date, all been based on UDP. To do
- this, a logical multi-cast network has been created within the
- Internet; this has been called MBONE (multi-cast backbone).
- Internet-attached customers interested in becoming part of
- MBONE should contact their regional provider.
-
- For more information of a technical nature, I direct you to the
- Association for Computing Machinery's Special Interest Group on
- Communication's (ACM SIGCOMM's) Computer Communication Review
- (CCR) from this fall (I don't have the publication with me, so
- I can't give you an exact date -- sorry). There is an article
- there by Steve Casner et. al. describing how MBONE is achieved.
-
- /jws
-