D-Link DSL-504 Product Manual - Page 43

DSL-504 ADSL Router User's Guide The network portion of an IP address will be referred to in this manual as a network number; the host portion will be referred to as a host number. To connect to the Internet or to any private IP network that uses an Internetassigned network number, you must obtain a registered IP network number from an Internet-authorized network information center. In many countries you must apply through a government agency, however they can usually be obtained from your Internet Service Provider (ISP). If your organization's networks are, and will always remain, a closed system with no connection to the Internet or to any other IP network, you can choose your own network numbers as long as they conform to the above rules. If your networks are isolated from the Internet, e.g. only between your two branch offices, you can assign any IP Addresses to hosts without problems. However, the Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of IP Addresses specifically for private (stub) networks: Class A B C Beginning Address 10.0.0.0 172.16.0.0 192.168.0.0 Ending Address 10.255.255.255 172.31.255.255 192.168.255.25 5 It is recommended that you choose private network IP Addresses from the above list. For more information on address assignment, refer to RFC 1597, Address Allocation for Private Internets and RFC 1466, Guidelines for Management of IP Address Space. Subnet Mask In the absence of subnetworks, specifying subnet masks as shown below may use standard TCP/IP addressing. IP Class Class A Class B Class C Subnet Mask 255.0.0.0 255.255.0.0 255.255.255.0 Subnet mask settings other than those listed above add significance to the interpretation of bits in the IP address. The bits of the subnet mask correspond directly to the bits of the IP address. Any bit an a subnet mask that is to correspond to a net ID bit in the IP address must be set to 1. 37