lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <47221CE4.70103@hp.com>
Date:	Fri, 26 Oct 2007 09:59:16 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Gaurav Aggarwal <grv.aggarwal@...il.com>
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	linux-net@...r.kernel.org, linux-kernel@...r.kernel.org,
	davidsen@....com
Subject: Re: Bad TCP checksum error

Checksum Offload on the NIC(s) can complicate things.  First, if you are tracing 
on the sender, the tracepoint is before the NIC has computed the full checksum. 
  IIRC only a partial checksum is passed-down to the NIC when CKO is in use.

So, making certain your trace is from the "wire" or the receiver rather than the 
sender would be a good thing, and trying again with CKO disabled on the 
interface(s) (via ethtool) might be something worth looking at.  Ultimately, 
doing the partial checksum modificiations in a CKO-friendly manner might be a 
good thing.

rick jones
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ