Problem with gif and IPv6 in -CURRENT
Joe Marcus Clarke
marcus at FreeBSD.org
Fri Dec 8 09:25:22 PST 2006
On Fri, 2006-12-08 at 22:54 +0800, gnn at freebsd.org wrote:
> 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.
This did it. Thanks! In 6.X I could use a default route of 3ffe:604::1
(in this example), and I did not need a route at all just to get to the
other end of the PTP link. All the examples I found online assumed
4.4-RELEASE up to 6.X.
Joe
--
Joe Marcus Clarke
FreeBSD GNOME Team :: gnome at FreeBSD.org
FreeNode / #freebsd-gnome
http://www.FreeBSD.org/gnome
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