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Enable Port Preservation: Place a check in this box to enable Port Preservation.
NAT Port preservation (on by default) tries to ensure that, when a LAN host makes
an Internet connection, the same LAN port is also used as the Internet visible port.
This ensures best compatibility for internet communications. Under some
circumstances it may be desirable to turn off this feature.
Enable anti-spoof checking:
checking. Enabling this option can provide protection from certain kinds of "spoofing"
attacks. However, enable 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.
accessible to Internet traffic, such as web, FTP, email and DNS servers.
Place a check in this box to enable anti-spoof
Typically, the DMZ host contains devices
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