Compex WP54AG - Manual (Page 136)

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You may wish to set up a DMZ host if you intend to use a special-
purpose Internet Service such as an online game for which no i
NOTE
1. When you enable DMZ, the Static IP Address configuration is
recommended for the DMZ host. Otherwise, if the address is
allocated by DHCP, it may change and DMZ will not function
properly.
2. DMZ allows the host to expose ALL of its parts to the Internet.
The DMZ host is thus susceptible to malicious attacks from the
Internet.