[ale] IPv6 routing issues

[Michael H. Warfield]

On Thu, 2009-09-03 at 09:53 -0600, JK wrote:
> Hi ALE,

> I installed the freenet6.net IPv6 tunnel client (tspc) on my Ubuntu box,
> and it establishes a tunnel successfully using my account credentials.
> However, I can't get a reply from ping6'ing any remote host -- "No
> route to host".

> So, hmm, I guess it's a routing problem.  And in fact "ip route list"
> reveals no IP6 routing info.  Google is rife with advice to set up a
> default IP6 route via the tunnel device:

>    ip route add ::/0 dev sit1

> But this does not help at all.  Further, the route does not even seem
> to be added (even though the "ip route" command succeeds): subsequently,

>    ip route list dev sit1

> returns no entries, and a plain "ip route list" shows nothing that
> looks like the IP6 route I just added.

	Try "ip -6 route ls".  Without the -6 it's only going to show you the
v4 routes.

	Sounds like IPv6 has been initialized properly OR you have IPv6
forwarding enabled.  It's a peculiarity (a deliberate peculiarity) that
the kernel will not honor the IPv6 default route if IPv6 forwarding is
enabled.  This was, ostensibly, to prevent the accidental routing of
link-local, site-local, and scoped multicast beyond their designed
scopes.

	Try this instead: "ip -6 route add 2000::/3 dev sit1"

	See if that works any better for you.  If that works, you've got IPv6
forwarding enabled.  Depending on your conmfiguration / allocation from
Freenet6, tspc will do that for you automatically.  If you had them
allocate a /64 or /48 to you, your configuration will enable v6
forwarding when you bring up the tunnel.

> Any help?

> TIA,

> -- JK

	Regards,
	Mike
-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
   NIC whois: MHW9          | An optimist believes we live in the best of all
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