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Old 06-04-2010, 01:48 PM
Ferenc Wagner
 
Default Bug#584549: linux-2.6: please enable CONFIG_IP_VS_IPV6

Package: linux-2.6
Version: 2.6.32-15
Severity: wishlist

Kconfig says:

Add IPv6 support to IPVS. This is incomplete and might be dangerous.

The implementation certainly is incomplete, but at the same time usable
in real-word situations. I've got no idea why it could be dangerous,
but will try to get some info on that.

Meanwhile, please consider setting this option, or describe why it's out
of question if so.

Thanks,
Feri.

-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 2.6.32-5-686 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash



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Old 06-21-2010, 11:26 AM
Ferenc Wagner
 
Default Bug#584549: linux-2.6: please enable CONFIG_IP_VS_IPV6

Hi,

netdev wasn't particularly interested, but Julius Volz, the author of
this code directed me to the lvs-users mailing list. Nobody reported
any problem since then, but I got a success report, see
http://thread.gmane.org/gmane.linux.network/163055/focus=11035

I also got a personal reply from Rob Gallagher. Quoting him:

> From: Rob Gallagher <robert.gallagher@heanet.ie>
> Subject: Re: Is CONFIG_IP_VS_IPV6 still/really dangerous?
> To: Ferenc Wagner <wferi@niif.hu>
> Cc: Julius Volz <juliusv@google.com>
> Date: Thu, 17 Jun 2010 15:56:53 +0100
>
> We've been using IPVS with IPv6 on our mirror site, ftp.heanet.ie, for
> nearly a year now.
>
> The only major issue we encountered was with mtu discovery for some
> users on IPv6 tunnels, however this was quickly resolved with a patch
> from Julius that has since gone into the mainline kernel.

The referenced patch is commit 94b26551: IPVS: Add handling of incoming
ICMPV6 messages, which is seems to be already present in the Sid kernel.

Based on the above, I don't think there are known problems with this
option. While it's untested on the wider scale, it seems to work for
those using it. Please consider enabling it, or tell me how I could
help researching this further.
--
Thanks,
Feri.



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Old 06-24-2010, 12:52 AM
Ben Hutchings
 
Default Bug#584549: linux-2.6: please enable CONFIG_IP_VS_IPV6

On Mon, 2010-06-21 at 13:26 +0200, Ferenc Wagner wrote:
> Hi,
>
> netdev wasn't particularly interested, but Julius Volz, the author of
> this code directed me to the lvs-users mailing list. Nobody reported
> any problem since then, but I got a success report, see
> http://thread.gmane.org/gmane.linux.network/163055/focus=11035
>
> I also got a personal reply from Rob Gallagher. Quoting him:
>
> > From: Rob Gallagher <robert.gallagher@heanet.ie>
> > Subject: Re: Is CONFIG_IP_VS_IPV6 still/really dangerous?
> > To: Ferenc Wagner <wferi@niif.hu>
> > Cc: Julius Volz <juliusv@google.com>
> > Date: Thu, 17 Jun 2010 15:56:53 +0100
> >
> > We've been using IPVS with IPv6 on our mirror site, ftp.heanet.ie, for
> > nearly a year now.
> >
> > The only major issue we encountered was with mtu discovery for some
> > users on IPv6 tunnels, however this was quickly resolved with a patch
> > from Julius that has since gone into the mainline kernel.
>
> The referenced patch is commit 94b26551: IPVS: Add handling of incoming
> ICMPV6 messages, which is seems to be already present in the Sid kernel.
>
> Based on the above, I don't think there are known problems with this
> option. While it's untested on the wider scale, it seems to work for
> those using it. Please consider enabling it, or tell me how I could
> help researching this further.

Thanks for the information. This will be enabled in the next version.

Ben.

--
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.
 

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