From: Brad Campbell <brad@wasp.net.au>
To: Josan Kadett <corporate@superonline.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Entirely ignoring TCP and UDP checksum in kernel level
Date: Sun, 22 Aug 2004 10:17:24 +0400 [thread overview]
Message-ID: <41283A74.101@wasp.net.au> (raw)
Josan Kadett wrote:
> That is certainly what I require but I need some guidelines; I investigated
> into the issue and fount out that;
>
> - By only changing the source address coded in the IP header
> - And by just applying checksum to IP header [Not TCP or UDP]
>
> The problem would be gone since when the source IP in the IP address field
> is validated, the checksum in the underlying protocol is automatically
> validated (because the sender system had already computed this CRC using the
> IP address which we want to write onto the packet)
>
> I do not have much time to build a code just for this purpose and thus I am
> looking for a simple app. or some other way...
So if we took any packet that came in from 192.168.1.1 and substituted 192.178.77.1 for the Source
address and then re-calculated the IP checksum you would be up and running?
Regards,
Brad
next reply other threads:[~2004-08-22 6:16 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-22 6:17 Brad Campbell [this message]
2004-08-22 7:18 ` Entirely ignoring TCP and UDP checksum in kernel level Josan Kadett
2004-08-22 7:24 ` Josan Kadett
2004-08-22 7:04 ` Brad Campbell
2004-08-22 8:12 ` Josan Kadett
2004-08-22 8:29 ` Brad Campbell
[not found] <41285DB3.6070605@wasp.net.au>
2004-08-22 10:14 ` Josan Kadett
2004-08-22 11:48 ` James Courtier-Dutton
2004-08-22 10:25 ` Josan Kadett
2004-08-22 9:36 ` Brad Campbell
2004-08-22 10:48 ` Josan Kadett
2004-08-22 13:10 ` Brad Campbell
2004-08-22 13:13 ` Brad Campbell
2004-08-22 19:27 ` Josan Kadett
2004-08-22 20:28 ` Josan Kadett
2004-08-23 3:38 ` David Meybohm
2004-08-23 5:26 ` Josan Kadett
2004-08-23 8:40 ` Josan Kadett
-- strict thread matches above, loose matches on Subject: below --
2004-08-22 9:19 Brad Campbell
[not found] <04Aug21.205911edt.41960@gpu.utcc.utoronto.ca>
2004-08-22 2:08 ` Josan Kadett
2004-08-22 6:01 ` Brad Campbell
2004-08-22 7:06 ` Josan Kadett
[not found] <1093120934.854.155.camel@krustophenia.net>
2004-08-21 20:46 ` Lee Revell
2004-08-21 21:53 ` Josan Kadett
[not found] <4126FDD8.1090101@gmc.lt>
2004-08-21 9:00 ` Josan Kadett
2004-08-21 8:11 ` Denis Vlasenko
2004-08-21 9:18 ` Josan Kadett
2004-08-21 8:26 ` Lee Revell
2004-08-21 9:35 ` Josan Kadett
2004-08-21 9:14 ` Vojtech Pavlik
[not found] <1093078213.854.76.camel@krustophenia.net>
2004-08-21 8:58 ` Lee Revell
2004-08-21 21:41 ` Josan Kadett
2004-08-21 8:27 Denis Vlasenko
2004-08-21 8:41 ` Lee Revell
2004-08-21 9:50 ` Josan Kadett
2004-08-21 9:06 ` Kalin KOZHUHAROV
2004-08-21 21:46 ` Josan Kadett
2004-08-21 9:39 ` Josan Kadett
[not found] <4126F16D.1000507@gmc.lt>
2004-08-21 8:02 ` Josan Kadett
2004-08-21 7:36 ` Kalin KOZHUHAROV
2004-08-21 8:54 ` Josan Kadett
2004-08-21 6:15 Josan Kadett
2004-08-21 7:10 ` Willy Tarreau
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