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From: David Miller <davem@davemloft.net>
To: davidn@davidnewall.com
Cc: kaber@trash.net, kadlec@blackhole.kfki.hu,
	jeff.chua.linux@gmail.com, linux-kernel@vger.kernel.org,
	ole@ans.pl, cups-bugs@easysw.com,
	netfilter-devel@vger.kernel.org
Subject: Re: cups slow on linux-2.6.24
Date: Thu, 31 Jan 2008 18:12:09 -0800 (PST)	[thread overview]
Message-ID: <20080131.181209.193710785.davem@davemloft.net> (raw)
In-Reply-To: <47A26C12.9020801@davidnewall.com>

From: David Newall <davidn@davidnewall.com>
Date: Fri, 01 Feb 2008 11:17:14 +1030

> Patrick McHardy wrote:
> > Jozsef Kadlecsik wrote:
> >> Strange, but there are a lot of incorrect checksum packets. How does
> >> it come on the loopback interface?
> >
> > Loopback doesn't perform full checksumming, so thats expected.
> 
> The question remains: How do loopback packets get incorrect checksum? 
> Where and how can they get corrupted?

There are zeros there, which is an incorrect checksum most
of the time.

Tcpdump is just not knowledgable about this and tries to
validate the checksum as if it were computed correctly.

  reply	other threads:[~2008-02-01  2:11 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-28 22:41 Jeff Chua
2008-01-28 22:56 ` Krzysztof Oledzki
2008-01-28 23:55   ` Jeff Chua
2008-01-29 10:53 ` Jozsef Kadlecsik
     [not found]   ` <b6a2187b0801291924k15f883aeg54f704156e4f2e3e@mail.gmail.com>
2008-01-30 13:47     ` Patrick McHardy
2008-01-31  2:23       ` Jeff Chua
     [not found]         ` <b6a2187b0801301826l5a50ce84p7d5dce3d0a74b3c0@mail.gmail.com>
2008-01-31  2:41           ` Patrick McHardy
2008-01-31  3:21             ` Jeff Chua
2008-01-31  3:25               ` Patrick McHardy
2008-01-31  5:01                 ` Jeff Chua
2008-01-31 10:40                   ` Jozsef Kadlecsik
2008-01-31 18:53                     ` Patrick McHardy
2008-02-01  0:47                       ` David Newall
2008-02-01  2:12                         ` David Miller [this message]
2008-02-01  6:07                           ` David Newall
2008-02-01  6:10                             ` Patrick McHardy
2008-02-01  5:28                     ` Jeff Chua
2008-02-02 14:44                       ` Jozsef Kadlecsik
2008-02-03 16:08                         ` Jeff Chua
  -- strict thread matches above, loose matches on Subject: below --
2008-02-10 15:06 Jeff Chua
2008-02-14 15:02 ` Jozsef Kadlecsik
2008-02-14 22:50   ` David Miller
2008-02-15  1:44     ` Patrick McHardy
2008-02-05  1:17 Jeff Chua
2008-02-05  8:16 ` Jozsef Kadlecsik
2008-02-05 13:47   ` Patrick McHardy
     [not found] <Pine.LNX.4.64.0802042226340.28805@boston.corp.fedex.com>
2008-02-04 20:17 ` Jozsef Kadlecsik
2008-01-27 23:18 Jeff Chua

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