Billion Electric Company BiPAC 7300GX - Manual (Page 105)

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1. If you disable the NAT option in the WAN-ISP section, the Virtual
Server function becomes invalid.
2. If the DHCP server option is enabled, you have to be very careful in
assigning the IP addresses of the virtual servers in order to avoid
conflicts. The easiest way of configuring Virtual Servers is to
manually assign a static IP address to each virtual server PC, with an
address that does not fall into the range of IP addresses that are
issued by the DHCP server. You can configure the virtual server IP
address manually, but it must still be in the same subnet as the
router.
Attention
Using port mapping does have security implications, since outside users
are able to connect to PCs on your network. For this reason you are
advised to use specific Virtual Server entries just for the ports your
application requires instead of simply using DMZ or creating a Virtual
Server entry for “All” protocols, as doing so results in all connection
attempts to your public IP address accessing the specified PC.