Bug 135889

Summary:	TCP checksums incorrect
Product:	[openSUSE] SUSE Linux 10.1	Reporter:	Dirk Mueller <dmueller>
Component:	Kernel	Assignee:	E-mail List <kernel-maintainers>
Status:	RESOLVED INVALID	QA Contact:	E-mail List <qa-bugs>
Severity:	Normal
Priority:	P5 - None
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
Whiteboard:
Found By:	Other	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---
Attachments:	pcap

Description Dirk Mueller 2005-11-29 16:33:11 UTC

Hi, 

it seems current STABLE kernel emits packages with incorrect tcp checksums. the checksum seems to be always the value "0x19da2" instead of the correct one. 

See pcap trace I'll attach shortly.

Comment 1 Dirk Mueller 2005-11-29 16:33:46 UTC

Created attachment 59009 [details]
pcap

Comment 2 Dirk Mueller 2005-11-29 16:34:28 UTC

0x19da, not 0x19da2.

Comment 3 Olaf Kirch 2005-11-29 17:02:55 UTC

If it really did, you wouldn't be able to do any TCP at all.

More likely what you're seeing is a side effect of TSO or TX checksums.
The kernel simply doesn't fill in a valid checksum but leaves it to
the hardware.

On the wire, these packets should look good.

Comment 4 Dirk Mueller 2005-11-29 17:58:00 UTC

hmm, indeed. dumping on the other side doesn't show that. so my actual issue is something different.