Date: Fri, 19 May 2006 12:11:36 -0700 From: Julian Elischer <julian@elischer.org> To: Ian Smith <smithi@nimnet.asn.au> Cc: freebsd-net@freebsd.org, Mike Tancsa <mike@sentex.net> Subject: Re: improving transport over lossy links ? Message-ID: <446E1868.8020704@elischer.org> In-Reply-To: <Pine.BSF.3.96.1060520014045.15967A-100000@gaia.nimnet.asn.au> References: <Pine.BSF.3.96.1060520014045.15967A-100000@gaia.nimnet.asn.au>
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Ian Smith wrote: >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 .. > > mpd does well, bit keep the mtu on the interface relatively small if you have a lot of line noise. I have not tried ppp with multilink. > > > 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 > >_______________________________________________ >freebsd-net@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-net >To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > >
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