Date: Fri, 19 May 2006 15:32:17 -0400 From: Chuck Swiger <cswiger@mac.com> To: freebsd-net@freebsd.org Cc: Mike Tancsa <mike@sentex.net> Subject: Re: improving transport over lossy links ? Message-ID: <446E1D41.9070301@mac.com> In-Reply-To: <446E1868.8020704@elischer.org> References: <Pine.BSF.3.96.1060520014045.15967A-100000@gaia.nimnet.asn.au> <446E1868.8020704@elischer.org>
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Julian Elischer wrote: > 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. Agreed. If you can live with doing so, using an MTU of around 512 worked pretty well back in the days that I was using a 19200 baud DOV (data over voice modem) that tended to experience line noise & hence packet drops when you got an incoming voice call; if you've got a high-noise environment, well, that would be similar. Of course, you should make sure that obvious fixes like replacing phone cabling or re-punching down the phone lines at your demarc (assuming you have 66 or 110 blocks) doesn't help. -- -Chuck
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