Determine ip address on tun0 for use with ipfw

Martin Moeller mm at
Sat Mar 29 04:28:57 PST 2003

Hello, list!

I just read some documentation on ipfw, and also found example
configuration files that can be used as a template.

Now, I'm sitting in front of such a file and want to adapt it for
my needs. But the first problem is already there:

The file uses variables for the inside and outside interfaces.
The inside interface is clear: It uses a normal 192.168.. address. But
the outside interface is a DSL modem. The ethernet card is vr0 and uses, but the actual interface needed here is tun0 which gets a new
ip address every time the PPP connection is established.

How can I get my ip address into my rc.firewall script? 


Martin Möller <mm at>
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