Re: 2.4.21+ - IPv6 over IPv4 tunneling b0rked

CaT (cat@zip.com.au)
Fri, 11 Jul 2003 09:39:31 +1000

On Thu, Jul 10, 2003 at 07:27:13PM +0300, Mika Liljeberg wrote:
> On Thu, 2003-07-10 at 18:43, CaT wrote:
> > ip tunnel add sit1 mode sit remote 138.25.6.14
> > ip link set sit1 up
> > ip addr add 3ffe:8001:000c:ffff::37/127 dev sit1
> > ip route add ::/0 via 3ffe:8001:000c:ffff::36
> > RTNETLINK answers: Invalid argument
>
> Try this:
>
> ip route add ::/0 dev sit1

That didn't complain but pings to the ext gw were broken. Noticed the
route contained:

3ffe:8001:c:ffff::36/127 via :: dev sit1 proto kernel metric 256 mtu 1480 adv
mss 1420

And having remembered /127 being mentioned as bad I changed the
interface config to a netmask of /64. Dropped it and brought it
up and it all works.

There's something fundamental about ipv6 netmasks that I just don't
understand...

-- 
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other day," he said.
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