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To: David Harmelin <david.harmelin@dante.org.uk>
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In-reply-to: david.harmelin's message of Thu, 25 May 2000 10:29:57 +0100.
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Subject: Re: nd6_lookup: failed to add route for neighbor
From: itojun@iijlab.net
Date: Thu, 25 May 2000 19:50:30 +0900
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>The diagram is correct.
>If I configure 3ffe:8038:80:3::3 to gif0, how is the mapping between that 
>address and fxp1 done? (there are more than one network card)

	you should have some address space assigned from the upstream,
	separately from 3ffe:8038:80:3::3.  if you do not have one, then
	too bad, you cannot assign IPv6 address to fxp1 - you are assigned
	single IPv6 address for your tunnel, not for your ethernet.

	for example, suppose you have got 3ffe:8038:ffff::/48 address space
	assigned from the upstream.  you have 65536 subnet addresses,
	starting from 3ffe:8038:ffff:0000::/64 to 3ffe:8038:ffff:ffff::/64,
	for you to play with.  you need to pick one for the ethernet segment
	which is directly connected to fxp1, and configure that to fxp1.
	let's pick 3ffe:8038:ffff:0000::/64 for the ethernet segment.

	now, try
	% ifconfig fxp1
	and see what is your link-local address, and what is your interface
	identifier.

>fxp1: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>	media: Ethernet manual
>	inet xx.yy.zz.uu netmask 0xffffff00 broadcast xx.yy.zz.0
>	inet6 fe80::a00:5aff:fe38:6f86%fxp1 prefixlen 64 scopeid 0x1

	the IPv6 address staring from "fe80::" is the link-local address for
	fxp1.  the lowermost 64 bits (a00:5aff:fe38:6f86) are interface
	identifier.

	you append the interface identifier to the address for segment,
	and make the address for fxp1.  that is:

		3ffe:8038:ffff:0000:a00:5aff:fe38:6f86

	you need to configure it to fxp1.

	# ifconfig fxp1 inet6 3ffe:8038:ffff:0000:a00:5aff:fe38:6f86 \
		prefixlen 64 alias
	(I'm not sure how to configure it in freebsd /etc/rc.conf framework)

>I tried it, but the following routing entry is not there anymore:
>3ffe:8038:80:3::3                 0:d0:b7:20:8a:7b              UHLW        lo0
>which maps the ipv6 address to the mac address.

	you don't need it.

itojun


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