From: Herbert Xu <herbert@gondor.apana.org.au>
To: Krzysztof Oledzki <olel@ans.pl>
Cc: netdev@vger.kernel.org
Subject: Re: incorrect cksum with tcp/udp on lo with 2.6.20/2.6.21/2.6.22
Date: Tue, 2 Oct 2007 18:40:33 +0800 [thread overview]
Message-ID: <20071002104033.GA30281@gondor.apana.org.au> (raw)
In-Reply-To: <Pine.LNX.4.64.0709241128490.26474@bizon.gios.gov.pl>
On Mon, Sep 24, 2007 at 11:44:19AM +0200, Krzysztof Oledzki wrote:
>
> So, with DR mode, packet goes by the lo device (with bad checksum) and
> then get redirected outside. Unfortunately, when it leaves host it has bad
> checksum, too. :(
Did you check this by taking a tcpdump on an external host?
Doing a local tcpdump doesn't work as tcpdump won't show the
correct checksum if checksum offload is enabled.
If it's really sending a bogus checksum then it's a bug in
LVS.
Cheers,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
next prev parent reply other threads:[~2007-10-02 10:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-13 17:55 incorrect cksum with tcp/udp on lo with 2.6.20/2.6.21/2.6.22 Krzysztof Oledzki
2007-09-23 4:39 ` Herbert Xu
2007-09-23 21:18 ` Krzysztof Oledzki
2007-09-24 1:30 ` Herbert Xu
2007-09-24 9:44 ` Krzysztof Oledzki
2007-10-02 10:40 ` Herbert Xu [this message]
2007-10-02 14:15 ` Krzysztof Oledzki
2007-10-02 14:17 ` Herbert Xu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20071002104033.GA30281@gondor.apana.org.au \
--to=herbert@gondor.apana.org.au \
--cc=netdev@vger.kernel.org \
--cc=olel@ans.pl \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox