Date: Sat, 21 Dec 1996 18:52:38 -0500 (EST) From: Chuck Robey <chuckr@glue.umd.edu> To: dicen@hooked.net Cc: Nate Williams <nate@mt.sri.com>, freebsd-questions@freebsd.org, freebsd-current@freebsd.org, freebsd-stable@freebsd.org Subject: Re: User ppp not hanging up modem. Message-ID: <Pine.OSF.3.95.961221184603.23960A-100000@packet.eng.umd.edu> In-Reply-To: <32BBB4C1.794BDF32@hooked.net>
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On Sat, 21 Dec 1996 dicen@hooked.net wrote: > Nate Williams wrote: > > > > > That's *NOT* the correct thing. What happens when for some reason > > PPP happens to send the sequence '+++' to the modem? All of a sudden > > it'll drop into command mode and you're screwed. User-PPP (as well as > > all other PPP/SLIP implementations I've worked with) assumes that you've > > disabled the escape sequence at least temporarily. > > > Interesting. But, what exactly is the prabobalitity of that? I will have > think about this one. Note that the standard command "&D3" tells the modem to reset itself when DTR drops. Nate's right, this _is_ standard. What he missed was that Hayes modems (Hayes originated the protocol that's now a defacto standard) used to get around the +++ transparency issue by requiring a 2 second dead time (either before or after the +++ code, I forget which). Hayes patented that delay, I think, which is why modems don't use it anymore. > > > > Most of this *is* already documented in the FreeBSD handbook. > > > > Nate > Nope. Nope. Nope. Yes, section 11.3.6. Nate's right. I have look through the entire /usr/share/doc tree and > didn't find anything about ppp not hanging up modems, etc.. Someone > please put this in the FAQ. I have read usenet posts about this one. > Other people are going through the hell I did. I don't like spending > hours debuging code only to discover the code is fine and my modem is > misconfigured (sure I should have thought of it first). > > dicen > ----------------------------+----------------------------------------------- Chuck Robey | Interests include any kind of voice or data chuckr@eng.umd.edu | communications topic, C programming, and Unix. 9120 Edmonston Ct #302 | Greenbelt, MD 20770 | I run Journey2 and picnic, both FreeBSD (301) 220-2114 | version 3.0 current -- and great FUN! ----------------------------+-----------------------------------------------
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