[support] no forwarding for PPP

[Jozsef Kovacs]

Hi,

I'm using a 2.6.22 kernel based patch and umip0.4 userland with the 
latest mcoa release. Using only a single tunnel over l2tp (ppp) works 
fine from the MR side, but packets are not forwarded from the Mobile 
Network.
ping6 -I ip6tnl1 from the MR works, forwarding is enabled on all 
interfaces. BUs are sent and BAs are received correctly.

Could it be because of multiple CoAs on the same interface?
          inet6 addr: xxx:yyy:d003:a::/64 Scope:Global
          inet6 addr: ::/64 Scope:Global
          inet6 addr: xxx:yyy:d003:a:5455:3035:f65d:cb8d/64 Scope:Global
          inet6 addr: fe80::5455:3035:f65d:cb8d/10 Scope:Link

The first address is registered on the HA.
I also find the /10 prefix for the LL address weird.

The whole scenario works well if I use a 80211 or ethernet device 
instead of ppp.

I have also applied to dad_necessary patch but I get the same result.
How does mip6 do the forwarding?

Thanks in advance
Jozsef