FreeBSD 7.1 IPv6 multihoming problem

[zgabe]

Hi All, 

I am using laptop, FreeBSD 7.1 connecting to two ISPs (wlan and ppp) and I
have IPv6 addresses. 'netstat -rn' says there is only one default gateway
(for example wlan's default gateway). My problem is the following: 
If I ping the ppp tunnel from an other computer, my laptop recieves the
ICMP6 echo request over the ppp tunnel, but it answers over the wlan
interface. I read some similar posts (only ipv4) about forwarding with IPFW,
but I was unable to solve my problem until now.

I built a kernel with the following options: 
options IPFIREWALL 
options IPFIREWALL_VERBOSE 
options IPFIREWALL_DEFAULT_TO_ACCEPT 
options IPFIREWALL_FORWARD 

and put these lines to my rc.conf 
firewall_enable="YES" 
firewall_type="open" 

as the handbook says. 

I use the following command as root: 
ipfw add 101 fwd pppgateway ipv6 from pppaddress to any 

(pppgateway and pppaddress ipv6 addresses)

It throws "getsockopt(IP_FW_ADD): Invalid argument" error! 

I have tried to set the following variables but the problem is still the
same. 
sysctl -w net.inet.ip.forwarding=1 and 
sysctl -w net.inet6.ip6.forwarding=1 

Can anybody help me? 

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