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Message-ID: <5E49BB50C165C44BAB7EB261EFFDF303FAD5@exch-mail2.win.slac.stanford.edu> From: rdc at slac.stanford.edu (Cowles, Robert D.) Subject: Ancient Trivia: +++ath0 The version I heard went something like: Hayes implemented a "guard" ... they required a pause between the "+++" and the following command. When other manufacturers implemented the command set, they had to make some small changes so they could claim they hadn't *completely* ripped off the Hayes command set ... they left out the requirement for the pause. So, on lots of non-Hayes modems, you could get them to hang up by just sending that string as data (or including it as data in a ping packet). Bob Cowles > -----Original Message----- > From: psz@...hs.usyd.edu.au [mailto:psz@...hs.usyd.edu.au] > Sent: Wednesday, March 17, 2004 6:17 PM > To: full-disclosure@...ts.netsys.com; lscharf@....vt.edu > Subject: Re: [Full-Disclosure] Ancient Trivia: +++ath0 > > Luke Scharf <lscharf@....vt.edu> wrote: > > > As the old BBS'ers and even older folks know, the string > "+++ath0" will > > disconnect a modem. ... > > Does anyone know what versions of windows had this > particular bug in the > > PPP implementation? Were any other systems affected? > > I guess that the problem is not so much an issue in PPP (on > the client PC > or at the ISP server), but the settings of both modems. To > fix, you need > > +++ats2=255 > > on both: see e.g. > > > http://www.tldp.org/HOWTO/Remote-Serial-Console-HOWTO/modem-ha > yes.html#MODEM-HAYES-ATTENTION > > for details. (Also, there was a discussion on BugTraq at the end of > September 1998, maybe it would be useful to look in the archives?) > > Cheers, > > Paul Szabo - psz@...hs.usyd.edu.au > http://www.maths.usyd.edu.au:8000/u/psz/ > School of Mathematics and Statistics University of Sydney > 2006 Australia > > _______________________________________________ > Full-Disclosure - We believe in it. > Charter: http://lists.netsys.com/full-disclosure-charter.html >
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