From owner-freebsd-net  Mon Jul  2 10:35:45 2001
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Date: Tue, 03 Jul 2001 02:35:28 +0900
Message-ID: <y7vy9q744kf.wl@condor2.jinmei.org>
From: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?= <jinmei@isl.rdc.toshiba.co.jp>
To: freebsd-net@FreeBSD.ORG
Subject: Re: Odd IPv6 behavior when not connected to IPv6 net 
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>>>>> On Mon, 02 Jul 2001 10:15:21 -0700, 
>>>>> "Kevin Oberman" <oberman@es.net> said:

>> I don't have any objection to changing the default interface to a
>> non-loopback one, *if the default is ever defined*.  I'm arguing that
>> it would be safe *not to specify the default interface by default*.

> Ah. I guess I missed your obvious point. I'm still thinking about the
> possible effects of not specifying a default route by default. At the
> moment I don't see any other "solution" to the problem. I think it's a
> "wrong" answer, but less "wrong" than any other answer I've seen.

> The real issue, from my perspective, is that nothing that discourages
> the use of IPv6 should be done. Default to loopback is unacceptable on
> both POLA and simple functional basis. (And I was VERY astonished!) A
> one minute delay is also unacceptable. So, we're stuck with whatever
> is left.

I'd recommend to simply disable the following part in rc.network6.

		# Disable installing the default interface with the
		# case net.inet6.ip6.forwarding=0 and
		# net.inet6.ip6.accept_rtadv=0, due to avoid conflict
		# between the default router list and the manual
		# configured default route.
		case ${ipv6_gateway_enable} in
		[Yy][Ee][Ss])
			;;
		*)
			if [ `sysctl -n net.inet6.ip6.accept_rtadv` -eq 1 ]
			then
---->				ndp -I ${ipv6_default_interface}
			fi

Actually, disabling this part has almost no bad effect.  The only
possible bad effect is that we cannot make communication in the
following case:

- we do not have any default router that advertises Router
  Advertisements.
- the destination node should be on-link, but does not share address
  prefix with us.

I strongly believe such a situation is very rare, and can be ignored
in normal cases.

					JINMEI, Tatuya
					Communication Platform Lab.
					Corporate R&D Center, Toshiba Corp.
					jinmei@isl.rdc.toshiba.co.jp

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