(more) confusion configuring NAT

Christopher Cowart ccowart at rescomp.berkeley.edu
Wed Mar 19 14:15:24 PDT 2008

Robert Huff wrote:
> 	1) when I add the nat instance, it assigns it rule # 65100.  Is
> this a problem?  Is there a way to assign my own rule #?  (ipfw
> seems not to like two "add"s in the same line.)
> 	2) NAT still doesn't work.  Still connected, but can't surf to
> www.google.com using Firefox.

My kernel conf:
| options IPFIREWALL
| options LIBALIAS

My (abbreviated) ipfw.rules script:
| /sbin/ipfw -q nat 1 config if vlan98 log reset unreg_only same_ports
| $CMD allow all from any to any via lo0
| $CMD nat 1 ip4 from any to any
| $CMD allow icmp from any to any
| $CMD deny log ip from any to me
| $CMD allow ip4 from any to any

Chris Cowart
Network Technical Lead
Network & Infrastructure Services, RSSP-IT
UC Berkeley
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