Re: Problem with gif and IPv6 in -CURRENT

At Thu, 07 Dec 2006 17:44:43 -0500,
Joe Marcus Clarke wrote:
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> I am running:
> 
> FreeBSD jclarke-pc 7.0-CURRENT FreeBSD 7.0-CURRENT #81: Thu Dec  7
> 16:06:32 EST 2006     marcus_at_jclarke-pc:/usr/obj/usr/src/sys/JCLARKE-PC
>  i386
> 
> And I am trying to get a gif IPv6 tunnel up to a Cisco router.  I can
> get this to work on a 6.2-PRERELEASE server, but the -CURRENT machine
> always claims there is no route to the far end of the point-to-point
> link.  Here is my config:
> 
> # ifconfig gif0 create
> # ifconfig gif0 tunnel 172.18.173.17 10.29.100.75
> # ifconfig gif0 inet6 3ffe:604::2 3ffe:604::1 prefixlen 128
> # ifconfig gi0
> gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
>         tunnel inet 172.18.173.17 --> 10.29.100.75
>         inet6 fe80::211:11ff:fe10:461e%gif0 prefixlen 64 scopeid 0x4
>         inet6 3ffe:604::2 --> 3ffe:604::1 prefixlen 128
> 
> This looks good, and I can ping my local 3ffe:604::2 address.  However,
> when I ping 3ffe:604::1, I get:
> 
> ping6: UDP connect: No route to host
> 
> It's not lying.  I don't have a route to 3ffe:604::1:
> 
> # netstat -nr
> ...
> ::/96                             ::1                           UGRS
>     lo0
> ::1                               ::1                           UHL
>     lo0
> ::ffff:0.0.0.0/96                 ::1                           UGRS
>     lo0
> 2003:a02::/64                     link#1                        UC
>     em0
> 2003:a02::1                       00:11:11:10:46:1e             UHL
>     lo0
> 3ffe:604::2                       link#4                        UHL
>     lo0
> fe80::/10                         ::1                           UGRS
>     lo0
> fe80::%em0/64                     link#1                        UC
>     em0
> fe80::211:11ff:fe10:461e%em0      00:11:11:10:46:1e             UHL
>     lo0
> fe80::%lo0/64                     fe80::1%lo0                   U
>     lo0
> fe80::1%lo0                       link#3                        UHL
>     lo0
> fe80::%gif0/64                    link#4                        UC
>    gif0
> fe80::211:11ff:fe10:461e%gif0     link#4                        UHL
>     lo0
> ff01:1::/32                       link#1                        UC
>     em0
> ff01:3::/32                       ::1                           UC
>     lo0
> ff01:4::/32                       link#4                        UC
>    gif0
> ff02::/16                         ::1                           UGRS
>     lo0
> ff02::%em0/32                     link#1                        UC
>     em0
> ff02::%lo0/32                     ::1                           UC
>     lo0
> ff02::%gif0/32                    link#4                        UC
>    gif0
> 
> The IPv4 address on the other end of the tunnel is reachable, and the
> Cisco router has no problems finding a route to the FreeBSD machine.
> Here is the config from the Cisco side:
> 
> interface Tunnel1
>  no ip address
>  load-interval 30
>  ipv6 address 3FFE:604::1/126
>  ipv6 enable
>  tunnel source 10.29.100.75
>  tunnel destination 172.18.173.17
>  tunnel mode ipv6ip
> 
> Why isn't the other end of the point-to-point tunnel being instantiated
> in the routing table?  If I take this exact config to a 6.2 box, this
> works just fine, and the far end of the PTP link is instantiated in the
> routing table.  Thanks for any clues you can provide.

I'm not sure for the reason for that but I find that with this in my
rc.conf my PTP comes up just fine:

#IPv6 Config
gif_interfaces="gif0"
gifconfig_gif0="124.39.153.88 211.14.6.238"

ipv6_enable="YES"
ipv6_network_interfaces="bge0"
ipv6_ifconfig_bge0="2001:2f0:104:8081::1 prefixlen 64"
ipv6_defaultrouter="::1 -ifp gif0"
ipv6_gateway_enable="YES"

It might be the "ipv6_defaultrouter" line above that makes this all
work.

Best,
George