> What happens if you reverse it, and assign wi0, 192.168.0.230 and assign
> sis0 no ip?

I just tried that - the effects are reversed, too. Now I can ping it from
a wireless client, but not from the LAN anymore.

Anyway, I'm going with the netgraph bridge now. It does exactly what I
want it to, and speed is probably about the same (everything in the kernel
in both cases). Besides, we need netgraph anyway for MPD (PPPoE/PPTP).

Thanks,

Manuel