D-Link DI-604 - Manual (Page 17)

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HOME > WAN > Static IP Address
Choose Static IP Address if all WAN IP information is provided to you by
your ISP. You will need to enter in the IP address, subnet mask, gateway
address, and DNS address(es) provided to you by your ISP. Each IP
address entered in the fields must be in the appropriate IP form, which are
four IP octets separated by a dot (x.x.x.x). The Router will not accept the
IP address if it is not in this format.
IP Address: Public IP address provided by your ISP.
Subnet Mask: Subnet mask provided by your ISP.
ISP Gateway Address: Public IP address of your ISP that you are
connecting to.
Primary DNS Address: Primary DNS (Domain Name Server) IP provided
by your ISP
Secondary DNS Address: optional