Date: Fri, 06 Mar 2009 15:17:38 -0800 From: Doug Barton <dougb@FreeBSD.org> To: David Horn <dhorn2000@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: Proposal: Rework ipv6 rtsol initialization in rc.d Message-ID: <49B1AF12.2010302@FreeBSD.org> In-Reply-To: <25ff90d60903041057k2e8a469ej43734effd30fd3ff@mail.gmail.com> References: <25ff90d60903041057k2e8a469ej43734effd30fd3ff@mail.gmail.com>
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David Horn wrote:
> Proposal: Rework ipv6 rtsol initialization in rc.d
> Why: on multihomed or transient (e.g. laptops) connections, ipv6
> autoconfiguration can be slow, causing ipv6 initialization delays
> while waiting for unsolicited router advertisements
I don't quite understand this problem statement. Can you flesh it out
a bit?
> What: add devd.conf entries, create /etc/rc.d/rtsol script (ala
> dhclient script), modify network.subr, update man 5 rtsol
This sounds like a significant change so I would like to see a
thorough justification for it before it goes in, and it will need
thorough testing to make sure that there are no regressions.
> Discussion point: There is a comment in network.subr, and in man 5
> rtsol about multihomed connections not being appropriate for rtsol
>
> I read through RFC 2461 and 2462, and while it does list multihomed
> issues in appendix A of RFC 2461, it does not have any "MUST NOT" or
> "SHOULD NOT" language around router solicitations with respect to
> multihomed ipv6 systems. (Someone, please correct me if I am wrong
> here, or if there is some other RFC that applies) The multihomed
> issue is more around IPv6 autoconfiguration in general, not specific
> to soliciting for a router. Since FreeBSD already allows for IPv6
> autoconfiguration on multihomed ipv6 systems (just without calling
> rtsol on multiple interfaces), I would think that this is really a
> non-issue for rtsol.
My main concern would be making sure that the routing issues
(particularly default routes for the various interfaces) don't end up
with regressions. In general I agree with the concern that RA isn't
really designed for use in a multihomed environment. That said, there
aren't really any good multihome solutions in any case, so as long as
this doesn't break anything I'm not opposed to giving it a go.
hth,
Doug
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