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Date:      Mon, 24 Jul 2000 11:00:01 +0900
From:      JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?= <jinmei@isl.rdc.toshiba.co.jp>
To:        zaks@prioris.mini.pw.edu.pl
Cc:        freebsd-net@FreeBSD.ORG
Subject:   Re: "nd6_lookup: failed" after upgrade to 4.1-RC
Message-ID:  <y7vwvic8ezi.wl@condor.isl.rdc.toshiba.co.jp>
In-Reply-To: In your message of "Fri, 21 Jul 2000 19:27:14 %2B0200" <20000721192714.A75927@prioris.mini.pw.edu.pl>
References:  <20000721192714.A75927@prioris.mini.pw.edu.pl>

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>>>>> On Fri, 21 Jul 2000 19:27:14 +0200, 
>>>>> Slawek Zak <zaks@prioris.mini.pw.edu.pl> said:

> I have a tunnel v6 over v4. When I try to connect any host using ipv6
> I a flooded with messages saying:

> pf39 nd6_lookup: failed to add route for a \
> neighbor(3ffe:8010:0007:0002::0001), errno=17

> When I manualy delete the route to 3ffe:8010:0007:0002::0001 I get:

> pf39 nd6_lookup: failed to lookup \
> 3ffe:8010:0007:0002::0001 (if = gif0)

> In both cases I can communicate just fine, only the syslog hurts.

Please set 128 to the prefix length for a pair of source and
destination address on a p2p interface. If not, the kernel will regard
the peer as a neighbor and try to check reachability using IPv6
neighbor unreachability detection mechanism, which causes the above
warning.

So,

> ## IPv6
> ifconfig_gif0="inet6 3ffe:8010:7:2::2 3ffe:8010:7:2::1 prefixlen 126"

should be 
ifconfig_gif0="inet6 3ffe:8010:7:2::2 3ffe:8010:7:2::1 prefixlen 128"

By the way,

> ipv6_route_gif0="default 3ffe:8010:7:2::1"

does this mean that the default route is the global address? I
recommend you not to use a global address as a gateway in the routing
table, since a global gateway annoys routing protocols in some cases
(e.g. PIM for IPv6 does not work with a global gateway).

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


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