ipv6 dialup: "nd6_lookup: failed to lookup" problem (4.8-REL)

[Jan Pechanec]

On Fri, 4 Jul 2003, Hajimu UMEMOTO wrote:

>Hi,
>

	hello Hajimu,

>>>>>> On Thu, 3 Jul 2003 17:00:01 +0200 (CEST)
>>>>>> Jan Pechanec <jp at devnull.cz> said:
>
>jp> 	I try to receive an ipv6 address for my PPP link via autoconf
>jp> (against Cisco machine), but there is a problem I'm unable to solve so
>jp> far. I can see cisco's Router-Advertisement containing prefix etc.,
>jp> but no IP adress is assigned to tun0 interface. Anyone succesful in
>jp> IPv6 over dial-up PPP connection? When I manually assign IPv6 address,
>jp> connection works. My system is 4.8-RELEASE, PPP Version 3.1 - Apr 3
>2003.
>
>You cannot assign IPv6 address to tun0 by receiving RA on 4.8-RELEASE.
>It is because, ppp(8) assigns link-local address with prefixlen is
>/128.  But, RA expects that link-local is /64.

	thanks for your advice. I upgraded to STABLE from 20030703 and
autoconf is working now, BUT there is still a problem with default
gateway. After reboot, ppp connection works great:

tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
        inet6 fe80::290:27ff:fe78:9275%tun0 prefixlen 64 scopeid 0x6
        inet 195.250.136.161 --> 195.122.222.33 netmask 0xffffffff
        Opened by PID 421

Internet6:
Destination                       Gateway                       Flags      Netif Expire
::1                               ::1                           UH          lo0
fe80::%fxp0/64                    link#1                        UC         fxp0

	axxem.hide:~# rtsol -d tun0

tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
        inet6 fe80::290:27ff:fe78:9275%tun0 prefixlen 64 scopeid 0x6
        inet 195.250.136.161 --> 195.122.222.33 netmask 0xffffffff
        inet6 3ffe:80ee:2ee:1300:290:27ff:fe78:9275 prefixlen 64 autoconf
        Opened by PID 421

Internet6:
Destination                       Gateway                       Flags      Netif Expire
default                           fe80::2d0:baff:fef4:e80%tun0  UGc        tun0
::1                               ::1                           UH          lo0

	BUT, after closing the PPP connection and dialing again, rtsol
assigns IP6 address, but no default route is added:

tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
        inet6 fe80::290:27ff:fe78:9275%tun0 prefixlen 64 scopeid 0x6
        inet6 3ffe:80ee:2ee:1300:290:27ff:fe78:9275 prefixlen 64 autoconf

axxem.hide:~# rtsol -d tun0
axxem.hide:~# netstat -rn
Routing tables

Internet6:
Destination                       Gateway                       Flags      Netif Expire
::1                               ::1                           UH          lo0
3ffe:80ee:2ee:1300::/64           fe80::290:27ff:fe78:9275%tun0 Uc         tun0
3ffe:80ee:2ee:1300:290:27ff:fe78:9275 link#6                        UHL

axxem.hide:~# traceroute6 orange.kame.net
connect: No route to host


	It happened to work correctly even for 2 connections, but then
no new PPP connection adds default gateway for IPv6 to the routing
table :(

	regards, Jan.

-- 
Jan Pechanec <jp_at_devnull_cz>