[433] in linux-net channel archive
Re: Checksum errors in all TCP connections
daemon@ATHENA.MIT.EDU (Alan Cox)
Fri Jun 9 08:26:42 1995
From: iialan@iifeak.swan.ac.uk (Alan Cox)
To: epackman@dataradio.com (Eric Packman)
Date: Fri, 9 Jun 1995 11:36:05 +0100 (BST)
Cc: linux-net@vger.rutgers.edu
In-Reply-To: <199506071959.PAA09086@vhf.dataradio.com> from "Eric Packman" at Jun 7, 95 03:57:19 pm
> exessive retries) and a PPP connection to the Internet. I doubt this
> is PPP's fault, because of the errors on ethernet, and because I can
> use an external router (KA9Q) and the exact same symptoms occur.
The router proves nothing because checksums are computed end->end. Firstly
check your modem link doesn't have problems with overruns and has all
the correct handshaking configured. Secondly check the target machine. Its
remotely possible its some kind of hardware problem, a cache problem or
even a driver problem of some form. Most likely its just flow control
problems on the modem line.
> NOTICE: tcp sum: src C7540401, sum 00000004
> Wed Jun 7 15:08:37
I'm sure RFC1122 says MUST silently discard ;)
Alan
