netdev - Re: [rfc 0/3] IPVS: checksum updates

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Message-ID: <20080908104120.GB5795@verge.net.au>
Date:	Mon, 8 Sep 2008 20:41:22 +1000
From:	Simon Horman <horms@...ge.net.au>
To:	Julius Volz <juliusv@...gle.com>
Cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	Siim Põder <siim@...rad-teel.net>,
	Julian Anastasov <ja@....bg>,
	Malcolm Turnbull <malcolm@...dbalancer.org>,
	Vince Busam <vbusam@...gle.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [rfc 0/3] IPVS: checksum updates

On Mon, Sep 08, 2008 at 12:03:04PM +0200, Julius Volz wrote:
> On Mon, Sep 8, 2008 at 4:04 AM, Simon Horman wrote:
> > Hi,
> >
> > The impetus for this series of patches is Julian Anastasov noting
> > that "load balance IPv4 connections from a local process" checks
> > for 0 TCP checksums. Herbert Xu confirmed that this is not legal,
> > even on loopback traffic, but that rather partial checksums are
> > possible.
> >
> > The first patch in this series is a proposed solution to handle
> > partial checksums for both TCP and UDP.
> >
> > The other two patches clean things up a bit.
> >
> > I have not tested this code beyond compilation yet.
> 
> After some first tests, remote connections are still working, but not
> local ones from the director. The TCP handshake works and the
> connection is established, but all following packets arriving at the
> real server have an incorrect TCP checksum.
> 
> Btw., this happens both with and without this last series of patches,
> so I can't get the local client feature working at all. Looking at it
> further...

Ok, is this for both IPv4 & IPv6? Does it still occur with just the first
patch in this series applied?
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