Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!zaphod.mps.ohio-state.edu!ncar!boulder!stan!marvin!imp From: imp@marvin.Solbourne.COM (Warner Losh) Newsgroups: comp.protocols.tcp-ip Subject: Re: Cost of Internet access Message-ID: <1990Nov11.025310.25098@Solbourne.COM> Date: 11 Nov 90 02:53:10 GMT References: <9011101731.AA20352@ucbvax.Berkeley.EDU> Sender: news@Solbourne.COM Organization: Solbourne Computer, Inc. Lines: 44 Someone write: >>As long your implementation automatically brings up the circuit when there >>is a packet queued (at either end), the application layer can not distinguish >>dialup IP services from dedicated. SMTP simply gets a long delay on the >>initial connection. But most systems time out if they don't get a connection after 30 seconds or so. When I dial in to work from home, it takes at least that long to make the connection. Since a mailer will requeue to try later (anywhere from 10 minutes to a day depending on the mailer%), the line may well have disconnected by then to save charges. In article bzs@world.std.com (Barry Shein) writes: >Of course, if the other host will also dial you then that's a >solution. But I'm pretty sure (due to voice network charges and the >service relationship usually implied) this is not the model most >people are thinking of, they are effectively a leaf node and dial a >centralized host providing the SLIP service to them. However, SMTP doesn't work this way in practice. Sure, there is a command that tells the mail daemon on a remote machine to send mail down the line, but it isn't widely implemented. Unless my machine can connect to your machine, the mail usually doesn't go out. >One has to either use MX records so the centralized host accepts and >forwards the mail (the easiest solution), or use something like POP. This sounds like a good idea. But if you are going to do dialup already, why not just use uucp mail? It is simpler to setup than arranging slip lines. The whole idea of dialup access is good, if it can be done "fast" and on demand. TCP connection would show the line is still in use, but how do you work out things like UDP packets? There is no "connection" data or state associated with them. Warner -- %Mailers -- Sendmail is one mailer that is on the Internet. There are others that don't behave the same way that sendmail does, but are not the less just as standard conforming as sendmail. -- Warner Losh imp@Solbourne.COM How does someone declare moral bankruptcy?