SL200 User Manual
Chapter 3 Router Setup
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ALG (Application Layer Gateway): You can choose to enable ALG,
then the router will let that application correctly pass though the
NAT gateway.
3.7.5 DMZ (Demilitarized Zone)
If you have a client PC that cannot run Internet application
properly from behind the NAT rewall or after conguring the
Special Applications function, then you can open the client up to
unrestricted two-way Internet access.
Enter the IP address of a DMZ host to this screen. Adding a client
to the DMZ (Demilitarized Zone) may expose your local network to
a variety of security risks, so you can only use this option as a last
resort.