Date: Sat, 20 May 2006 02:06:21 +1000 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-net@freebsd.org Subject: Re: improving transport over lossy links ? Message-ID: <Pine.BSF.3.96.1060520014045.15967A-100000@gaia.nimnet.asn.au> In-Reply-To: <6.2.3.4.0.20060519110026.05820230@64.7.153.2>
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On Fri, 19 May 2006 at 11:06:48 -0400, Mike Tancsa wrote: > I am looking for a way to improve the reliability of a lossy link > (dialup from remote sites). I am going to try multilink PPP but was > wondering if something like ng_one2many might work as well ? Does > anyone have any suggestions for avenues to explore ? For multilink > ppp, does mpd offer any better performance / reliability over the stock ppp ? No idea whether these options may help, but .. > The application is low bandwidth, but doesnt deal that well with > packet loss and the phone lines in these remote locations tend to be > noisy and drop connections frequently. If by 'drop connections' you mean physical loss of line / carrier, then tuning the modem/s to be (preferably much) less aggressive about forcing the modem connection rate high - ie being easily satisfied to drop back to lower rates during hard times - has helped a lot with a dozen or so remote spots hereaboots. Finding the knobs for some modems can be hard. Assuming that V.42 error correction is working properly - forced if need be - there shouldn't =be= any data loss, however slow getting through, this side of protocol timeouts of course. I can't guess your mystery application, but often slower connections are better than dropped ones, or even ones that spend half their time trying to retrain at high rates. cheers, Ian
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