packets don't forward(?) with ipfw2

[Mark Cullen <mark.cullen@xxxxxxxxxxxxx>]

I just realised that to use IPFW2 on FBSD 4.x, and thus DF, you have to 
compile a kernel with IPFW2 and then recompile ipfw and libalias with 
-DIPFW2. So I did this, rebooted, and found that it was no longer 
'forwarding' packets. As in, none of my networked machines could use the 
internet; it was like they was being blocked. I went and used the most 
basic `firewall_type="OPEN"`, which allows anything. They still weren't 
able to use the internet. I recompiled ipfw+libalias without IPFW2 and 
booted my old kernel.. and it's working again now, with the same 
firewall_type="OPEN". Any ideas as to what's up here?
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