netbsd-7 ipfilter failure?

[6bone]

Hello,

I am trying to configure an ipv6 only host. To block the ipv4 traffic I 
added the following filter to /etc/ipf.conf:

block in on ixg0

The filter works, but also blocks ipv6 traffic. So I tried to enable ipv6 
in /etc/ipf6.conf with

pass in on ixg0

This enables all traffic, ipv4 and ipv6.

Is this an intentional behavior? In my opinion it is a security risk if 
ipv6 firewall rules can break ipv4 rules.



Regards
Uwe