Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!columbia!rutgers.rutgers.edu!ucla-cs!zen!ucbvax!CC5.BBN.COM!malis From: malis@CC5.BBN.COM (Andy Malis) Newsgroups: comp.protocols.tcp-ip Subject: Re: Internet Uselessness Message-ID: <8707201407.AA12061@ucbvax.Berkeley.EDU> Date: Mon, 20-Jul-87 10:09:32 EDT Article-I.D.: ucbvax.8707201407.AA12061 Posted: Mon Jul 20 10:09:32 1987 Date-Received: Tue, 21-Jul-87 04:48:48 EDT Sender: daemon@ucbvax.BERKELEY.EDU Distribution: world Organization: The ARPA Internet Lines: 26 Mike, As a whole, I think the internet community has been doing "clever engineering" for quite a number of years now. However, there comes a time when offered load just overwhelms the resources devoted to the task. We are very close to that point on the ARPANET, even though we just made the routing algorithm more "clever" and added another transcontinental trunk. We are currently in the process of implementing congestion control in the PSNs. This should optimize the total available throughput of the network (at the expense of backing flows into source hosts if necessary). Finally, the X.25 spec really says nothing about what goes on in the subnet, it is just an interface spec between a DTE and its DCE. Internally, the PSNs use virtual circuits to support both AHIP (1822) and X.25 traffic while using good old dynamic adaptive routing to get the packets between the endpoint PSNs. Internally, neither AHIP nor X.25 data packets contain full addressing information, just the destination PSN number and a connection identifier at that PSN. So I guess you might say that we "do it right". Cheers, Andy