[429] in linux-net channel archive
Checksum errors in all TCP connections
daemon@ATHENA.MIT.EDU (Eric Packman)
Wed Jun 7 18:03:34 1995
From: "Eric Packman" <epackman@dataradio.com>
To: linux-net@vger.rutgers.edu
Date: Wed, 7 Jun 1995 15:57:19 +0000
I know this is going to sound a little crazy, but methinks there is a
bug in Linux's IP checksum routine. At random times during a TCP
connection between a linux box (Linux 1.2.2+) and any other host, I
will get clusters of "bad TCP sum" messages (below). The linux
machine has an ethernet port (which also seems to occasionally have
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 /usr/adm/messages file from an SCO client report the TCP messages
below:
NOTICE: tcp sum: src C7540401, sum 00000002
Wed Jun 7 15:06:16
NOTICE: tcp sum: src C7540401, sum 00000002
Wed Jun 7 15:06:17
NOTICE: tcp sum: src C7540401, sum 00000002
Wed Jun 7 15:06:17
NOTICE: tcp sum: src C7540401, sum 00000002
Wed Jun 7 15:06:18
NOTICE: tcp sum: src C7540401, sum 00000002
Wed Jun 7 15:06:18
NOTICE: tcp sum: src C7540401, sum 00000002
Wed Jun 7 15:07:45
NOTICE: tcp sum: src C7540401, sum 00000002
Wed Jun 7 15:07:46
NOTICE: tcp sum: src C7540401, sum 00000002
Wed Jun 7 15:07:47
NOTICE: tcp sum: src C7540401, sum 00000002
Wed Jun 7 15:07:47
NOTICE: tcp sum: src C7540401, sum 00000004
Wed Jun 7 15:07:58
NOTICE: tcp sum: src C7540401, sum 00000004
Wed Jun 7 15:08:00
NOTICE: tcp sum: src C7540401, sum 00000004
Wed Jun 7 15:08:37
