Date: Tue, 3 Mar 1998 05:14:56 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: nate@mt.sri.com (Nate Williams) Cc: mike@smith.net.au, hasty@rah.star-gate.com, current@FreeBSD.ORG, jkh@time.cdrom.com Subject: Mbone at WC ? (was Re: 3.0 RELEASE) Message-ID: <199803030414.FAA22404@labinfo.iet.unipi.it> In-Reply-To: <199803022341.QAA24319@mt.sri.com> from "Nate Williams" at Mar 2, 98 04:41:05 pm
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> > > You know there is the MBone for this sort of scenarios and it ... > No kidding. Our ISP played with it for awhile (for watching NaNOG > meetings), and gave it up. They're now sending people to the meetings, > since it was much cheaper and useful than using the Mbone, which is > useless given the current 'lag' and 'loss' on the net as a whole. > > PHK's 40% packet loss to CA with normal traffic would make the MBONE > more than useless. It would simply waste bandwidth with no gain. i agree that mbone loss can be very bad at times or for some areas, but there are other applications where multicast would still work well. For example, for some time i have had an fec-based reliable multicast application (RMDP) which would be an ideal solution to things like distribution of new freebsd releases etc (to mirrors and/or end-users) if only the server had multicast. Jordan's message in this thread makes me thing that this could become a reality now... I myself have used this between freefall and here, over unicast UDP, at times where the loss was so bad that normal ftp would stall all the time. see http://www.iet.unipi.it/~luigi/fec.html for details. Microsoft has also a report (see research.microsoft.com and look for Jim Gemmel's page) indicating interest in such a technology, and there are many companies using similar technology. Cheers Luigi -----------------------------+-------------------------------------- Luigi Rizzo | Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it | Universita' di Pisa tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ _____________________________|______________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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