Listing IPFW2, IPFW, and IP6FW Rules with the Same Number

by Jacek Artymiak

IPFW, IPFW2, and IP6FW allow the ruleset writer to add more than one rule with the same number. Here's a command that lists rules with the same numbers:


IPFW/IPFW2:



$ ipfw show | cut -f 1 -d ’ ’ | uniq –d
00100
00243


IP6FW:



$ ip6fw show | cut -f 1 -d ’ ’ | uniq –d
00100
00243