Date: Sun, 21 May 2006 10:26:02 +0100 From: Brian Candler <B.Candler@pobox.com> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-net@freebsd.org, Ian Smith <smithi@nimnet.asn.au> Subject: Re: improving transport over lossy links ? Message-ID: <20060521092602.GB20262@uk.tiscali.com> In-Reply-To: <6.2.3.4.0.20060519121104.1126b480@64.7.153.2> References: <6.2.3.4.0.20060519110026.05820230@64.7.153.2> <Pine.BSF.3.96.1060520014045.15967A-100000@gaia.nimnet.asn.au> <6.2.3.4.0.20060519121104.1126b480@64.7.153.2>
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On Fri, May 19, 2006 at 12:38:31PM -0400, Mike Tancsa wrote: > Thanks for the reply. Even at 28.8 I am seeing loss with > the connection dropping and seeing dropped packets (e.g. > May 19 12:04:43 soekris4801 ppp[3404]: tun0: Phase: 1: HDLC errors -> > FCS: 1, ADDR: 0, COMD: 0, PROTO: 0) If you have an error-correcting modem, but you are seeing data corruption, then I'd expect the data corruption is occuring on the RS232 link between the PC and the modem at one end or the other. You may have a handshaking problem (i.e. ensure the modem is configured for CTS/RTS handshaking, and the port is configured for this too; with pppd it's "crtscts", I don't know about userland ppp; and ensure the cables are wired properly) If your app could cope with the lack of bandwidth, forcing the modems to 2400bps operation can make links over dodgy lines a lot more reliable. Regards, Brian.
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