Date: Sat, 21 Dec 1996 11:40:28 -0700 (MST) From: Nate Williams <nate@mt.sri.com> To: Richard Wackerbarth <rkw@dataplex.net> Cc: dicen@hooked.net, freebsd-questions@freebsd.org, Nate Williams <nate@mt.sri.com> Subject: Re: User ppp not hanging up modem. Message-ID: <199612211840.LAA27342@rocky.mt.sri.com> In-Reply-To: <l03010d01aee1dc47c650@[208.2.87.3]> References: <Pine.OSF.3.95.961221100409.6960B-100000@professor.eng.umd.edu> <32BBA85F.41C67EA6@hooked.net> <199612211751.KAA27123@rocky.mt.sri.com> <32BBB4C1.794BDF32@hooked.net> <l03010d01aee1dc47c650@[208.2.87.3]>
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> >> 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. > > Actually, NOTHING happens. The escape sequence must be followed by a period > of idle (output only) time. If you transmit any character before the > timeout period expires, the modem ignores the sequence. There is still a *very* small chance that the last three characters in a packet could be in fact three escape characters. Small as it is, I still contend that depending on the escape character/hangup behavior is prone to errors and failure. Nate
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