Hayes ADSL Duo Modem User Manual page 50

To set up a filter for online gaming or to create a DMZ, see
Chapter 2, Online Gaming on page 23.
Make these entries on the WAN IP Filter page of your
Configuration Manager:
Index A number 0-7 that will identify this filter
configuration.
NAT Network Address Translation. If this check box
is selected, the modem uses its WAN IP address
as the source address for outgoing packets.
NAT must be enabled if you are using private
IP addresses on the LAN.
NAT is enabled by default. If it is disabled,
computers on the LAN must have public IP
addresses.
Enable If this check box is selected, the rule is enabled.
Use Address If selected, lets you open up one computer on
Passthrough the LAN to all traffic allowed by the filter rule.
This allows teleconferencing or game-playing
over the Internet, for example.
LAN IP Required if NAT is enabled. If NAT is not
Address enabled and this field is left blank, the ADSL
Duo does not use the destination address.
WAN IP Optional. If blank, the ADSL Duo does not use
Address the source address when it matches packets
against the filter rule. If an address or subnet
specification (for example, 202.68.84.0/24) is
entered, the ADSL Duo uses the 202.68.84
(network) part of the address to filter packets.
Protocol Lets you select tcp, udp, all, or a tcp/udp
application.
If you select udp or tcp, you must specify port
numbers in the Ports field. If you select an
application, the modem automatically enters the
port number(s) into the rule.
If you set up a rule to use all, make sure it is the
last rule in the filter list. The ADSL Duo
46 Hayes ADSL Duo User's Guide