HP-UX IPFilter A.03.05.13 Administrator's Guide: HP-UX 11i v3

Table Of Contents
HP-UX IPFilter Configuration Examples
example.6
Appendix A 157
example.6
#
# block all TCP packets with only the SYN flag set (this is the
# first packet sent to establish a connection) out of the
# SYN-ACK pair.
#
block in proto tcp from any to any flags S/SA