1# $NetBSD: example.6,v 1.1.1.1 2012/03/23 21:20:15 christos Exp $
2#
3# block all TCP packets with only the SYN flag set (this is the first
4# packet sent to establish a connection) out of the SYN-ACK pair.
5#
6block in proto tcp from any to any flags S/SA
7