ipfwadm 2.3.0, 1996/07/30

Usage: ipfwadm -A [direction] command [options] (accounting)
       ipfwadm -F command [options] (forwarding firewall)
       ipfwadm -I command [options] (input firewall)
       ipfwadm -O command [options] (output firewall)
       ipfwadm -M [-s | -l] [options] (masquerading entries)
       ipfwadm -h (print this help information))

Commands:
  -i [policy]	insert rule (no policy for accounting rules)
  -a [policy]	append rule (no policy for accounting rules)
  -d [policy]	delete rule (no policy for accounting rules)
  -l		list all rules of this category
  -z		reset packet/byte counters of all rules of this category
  -f		remove all rules of this category
  -p policy	change default policy (accept/deny/reject)
  -s tcp tcpfin udp
		set masuerading timeout values
  -c		check acceptance of IP packet

Options:
  -P		protocol (either tcp, udp, icmp, or all)
  -S address[/mask] [port ...]
		source specification
  -D address[/mask] [port ...]
		destination specification
  -V address	network interface address
  -W name	network interface name
  -b		bidirectional match
  -e		extended output mode
  -k		match TCP packets only when ACK set
  -m		masquerade packets as coming from local host
  -n		numeric output of addresses and ports
  -o		turn on kernel logging for matching packets
  -r [port]	redirect packets to local port (transparent proxying)
  -t and xor	and/xor masks for TOS field
  -v		verbose mode
  -x		expand numbers (display exact values)
  -y		match TCP packets only when SYN set and ACK cleared
