Re: [PATCH RFC 00/24] IPVS: Add first IPv6 support to IPVS

To: "Simon Horman" <horms@xxxxxxxxxxxx>
Subject: Re: [PATCH RFC 00/24] IPVS: Add first IPv6 support to IPVS
Cc: netdev@xxxxxxxxxxxxxxx, lvs-devel@xxxxxxxxxxxxxxx, kaber@xxxxxxxxx, vbusam@xxxxxxxxxx, "Sven Wegener" <sven.wegener@xxxxxxxxxxx>
From: "Julius Volz" <juliusv@xxxxxxxxxx>
Date: Thu, 21 Aug 2008 11:59:44 +0200
On Thu, Aug 21, 2008 at 3:17 AM, Simon Horman <horms@xxxxxxxxxxxx> wrote:
> On Wed, Aug 20, 2008 at 06:15:07PM +0200, Julius Volz wrote:
>> What is not supported with IPv6:
>> - handling fragmentation or other extension headers
>> - FTP application helper (can be loaded, but only operates on v4)
>> - sync daemon (can be started, but only operates on v4)
> Other than the packet format of the sync deamon, are there any
> fundamental restrictions here? If we extended the sync daemon,
> could it work? If so, perhaps we could rev the sync deamon protocol
> and fix a few other kinks, like the handling of timeouts and the
> general lack of extendability, at the same time.

There shouldn't be any fundamental restrictions, it's just a piece of
the puzzle that I could easily leave out of the picture for now.

I haven't studied the sync daemon closely yet, but one thing I was
briefly wondering about was whether we should just blow up the
addresses in struct ip_vs_sync_conn to be of type union nf_inet_addr
(probably not acceptable, wasting too much bandwidth for v4 entries)
or how to send differently sized entries based on the IP version in a
clean way. But it sounds like you'd want to redesign a lot of that
anyways? I'm glad to help with anything, I just don't know this code
as well as you or Sven, but I'll study it more. Maybe you can share
some ideas on the extensibility you want to see?

>> Thanks for any comments!
> Unfortunately (or fortunately depending on how you look at it),
> I'm going to be away skiing for the next couple of days. Apologies
> for the slow responses that will lead to.

Have fun! And be careful, we need you to come back healthy :)


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