IOGear GWA504 Manual - Manual (Page 58)

Packet Filter enables you to control what packets
are allowed to pass the router.
Outbound filter applies on all outbound packets.
However, Inbound filter applies on packets that
destined to Virtual Servers or DMZ host only.
You can select one of the two filtering policies:
1. Allow all to pass except those match the specified
rules
2. Deny all to pass except those match the specified
rules
55
Packet Filter
Configuration Utility