User Manual Part 2

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 Enable anti-spoof checking: Place a check in this box to enable anti-spoof checking. Enabling this option can provide protection
from certain kinds of "spoofing" attacks. However, enble this option with care. With some modems, the WAN connection may be lost
when this option is enabled. In that case, it may be necessary to change the LAN subnet to something other than 192.168.0.x
(192.168.2.x, for example), to re-establish the WAN connection.
 Enable DMZ Host: Place check in this box to enable DMZ host. DMZ host is a demilitarized zone used to provide Internet services
without sacrificing unauthorized access to its local private network. Typically, the DMZ host contains devices accessible to Internet
traffic, such as web, FTP, email and DNS servers.
 DMZ IP Address: Specify the IP address of the DMZ host.
 Non-UDP/TCP/ICMP LAN Sessions: Place a check in this box to enable this feature. When a LAN application that uses a protocol
other than UDP, TCP, or ICMP initiates a session to the Internet, the router's NAT can track such a session, even though it does not
recognize the protocol. This feature is useful because it enables certain applications (most importantly a single VPN connection to a
remote host) without the need for an ALG.
 Note: This feature does not apply to the DMZ host (if one is enabled). The DMZ host always handles these kinds of sessions.
 Enabling this option (the default setting) enables single VPN connections to a remote host. (But, for multiple VPN connections, the
appropriate VPN ALG must be used.) Disabling this option, however, only disables VPN if the appropriate VPN ALG is also disabled.