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Date: Fri, 22 Jun 2001 16:46:24 +0900
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From: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?= <jinmei@isl.rdc.toshiba.co.jp>
To: David Delibasic <maddave@suxx.eu.org>
Cc: <freebsd-net@FreeBSD.ORG>
Subject: Re: IPv6 
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>>>>> On Thu, 21 Jun 2001 22:48:04 +0200 (CEST), 
>>>>> David Delibasic <maddave@suxx.eu.org> said:

>> ifconfig -a
> ep0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 213.161.8.158 netmask 0xffffff00 broadcast 213.161.8.255
>         inet6 fe80::2a0:24ff:fe8e:c462%ep0 prefixlen 64 scopeid 0x4
>         ether 00:a0:24:8e:c4:62
>         media: 10baseT/UTP
>         supported media: 10base2/BNC 10baseT/UTP 10base5/AUI

> gif0: flags=8011<UP,POINTOPOINT,MULTICAST> mtu 1280
>         inet6 fe80::280:c8ff:fe33:5c5d%gif0 --> :: prefixlen 64 scopeid 0x5
>         inet 192.168.254.5 --> 192.168.254.6 netmask 0xfffffffc
>         inet6 3ffe:1200:3028:8377:: --> 3ffe:1200:3028:8377::1 prefixlen 127

> gif2: flags=8011<UP,POINTOPOINT,MULTICAST> mtu 1280
>         inet6 fe80::280:c8ff:fe33:5c5d%gif2 --> :: prefixlen 64 scopeid 0x7
>         inet6 3ffe:1200:3028:ff01::6ef --> 3ffe:1200:3028:ff01::6ee prefixlen 127

> Did i misconfigured anything ?

We basically recommend users to configure a non-link-local address on
a point-to-point interface in one of the following manners:

1. use a prefix length smaller than 128 without the destination
   address.
2. use a prefix length 128 with the destination address.

You configured a global address with a prefix length smaller than 128
(i.e. 127), and specified the destination address of the tunnel link,
the configuration which meets none of above.  Thus, the kernel warns
when sending packets.

The easiest way to avoid the warnings would be to specify the prefix
length 128.

Since this problem has been asked so many times, the next release of
FreeBSD will reject this type of configuration, and will force users
to use one of the expected manners only.

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

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