Date: Tue, 21 Apr 1998 18:30:40 +0100 From: Jason Thomson <jason.thomson@mintel.co.uk> To: questions@FreeBSD.ORG Subject: PPP and ISDN TAs. (Specifically 3COM Impact IQ). Message-ID: <353CD7C0.FCA314DA@mintel.co.uk>
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I am intending to buy a 3Com Impact IQ ISDN TA in order to dial up to a local service provider from our office in Chicago. I have a couple of questions with regard to using this with a FreeBSD 2.2.6 box and the latest version of user ppp. (Please forgive my ignorance if some of the questions do not make a whole heap of sense - I must confess to not really understanding how this all works). According to the specs, the 3Com Impact IQ will do PPP, multilink PPP and async-sync PPP conversion. It also does CCP, CHAP and PAP. Normally, as I understand it, with a modem connection, these protocols and the negotiation for these protocols are all provided by user ppp (unless of course you use pppd). This, as I understand it, provides PPP framing over the raw serial link, and uses the other protocols CCP, CHAP, IPCP to negotiate compression, authentication and IP addresses. Now if the terminal adaptor itself negotiates all of the lower level protocols, how does user ppp know not to try and do them itself? (After all, as far as it is concerned, it is talking to a Hayes compatible AT modem?). As I said, I don't really understand this, but it would be a big help if someone could explain a bit about how this works and put my mind to rest. Here in the UK, I am using a MultiTech ISDN TA to connect to Demon Internet, but I can only get it to connect in V.120 mode (which only allows a relatively low data rate (57.6Kbps I think? - I guess that is actually running PPP over a V.120 link?) Am I doing anything wrong? How do I get a true 64Kbps PPP connection over here, and will I have any problems with the 3Com Impact IQ in the States? (Ideally, I want to be able to do PPP/MLPPP with compression as supported by the TA). Thanks for all your help (and patience). Cheers, Jason. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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