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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!saimiri.primate.wisc.edu!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!uwm.edu!daffy!uwvax!oka.cs.wisc.edu!jcargill From: jcargill@oka.cs.wisc.edu (Jon Cargille) Subject: Re: Dial Back Slip Message-ID: <1993Apr6.143911.13286@cs.wisc.edu> Sender: news@cs.wisc.edu (The News) Organization: Univ. of Wisconsin CS Dept References: <1993Apr5.111939@axion.bt.co.uk> Date: Tue, 6 Apr 1993 14:39:11 GMT Lines: 40 In article <1993Apr5.111939@axion.bt.co.uk> lessen@axion.bt.co.uk (Lee Essen) writes: > >Before I tried to load cgd's com drivers I have a working (ish!) serial >port and was trying to get some form of dial-back Slip going. > >This is what I did....am I doing it right? > [...startup steps deleted... They look reasonable....] > >The modem send and receive lights flash a bit. If I ping 132.146.99.1 >the transmit light flashes a bit, the receive light starts after a while >and then nothing! > >netstat -i will show a few sent packets and an incomming error! > >I'm not 100% confident in the error-free state of the link, but I left it >going for quite a while and never had one valid incoming packet! > >I wonder whether one end is doing header compression and the other >end not? That could cause such a problem. In fact, I've seen it cause exactly the type of confusion you describe before. Check that either both ends are doing compression, or neither is. The other thing which can cause similar symptoms is flow-control. Make sure that neither modems is configured for XON/XOFF flow-control... (make sure neither serial line is either.) SLIP packets will include XON/XOFF characters, which can really confuse things if they get interpreted a flow-control. Set the modems up either for RTS/CTS flow-control, or none. Hope this helps, Jon -- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-. Jon Cargille jcargill@cs.wisc.edu Want your .sig compressed? Reasonable rates and fast turnaround. Call today!