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On Mon, Sep 08, 2008 at 08:41:22PM +1000, Simon Horman wrote:
> 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?
It's for both, although I only tested IPv4 at first. Here is a complete
test matrix of what works when:
CR = connection refused
T = connection timeout
C = connection established, but not working afterwards
OK = working
remote client | local client
COMMIT v4 v6 | v4 v6
======================================|=================
CSUM 3/3 OK T | C T
CSUM 2/3 OK T | C T
CSUM 1/3 OK T | OK T
W/O CSUM OK T | C T
... |
f2428ed5 OK T | CR CR
4856c84c OK CR | CR CR
f94fd041 (my last one) OK OK | CR CR
So the last time that IPv6 was working _at all_ was at my last commit of
the big v6 series...
Julius
--
Julius Volz - Corporate Operations - SysOps
Google Switzerland GmbH - Identification No.: CH-020.4.028.116-1
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