3Com 3C17300-US Implementation Manual

Contents

102 A PPENDIX C: IP A DDRESSING192.168.100.X (where X is a number between 1 and 254) with a subnetmask 255.255.255.0. If you are using SLIP, use the default SLIP address of192.168.101.1 with a subnet mask of 255.255.255.0.These suggested IP addresses are part of a group of IP addresses thathave been set aside specially for use “in house” only.CAUTION: If your network has a connection to the external IP network,you must apply for a registered IP address. This registration systemensures that every IP address used is unique; if you do not have aregistered IP address, you may be using an identical address to someoneelse and your network will not operate correctly.Obtaining a Registered IP AddressInterNIC Registration Services is the organization responsible forsupplying registered IP addresses. The following contact information iscorrect at time of publication:World Wide Web site: http://www.internic.netAdvanced Overview IP addresses are 32-bit addresses that consist of a network part (theaddress of the network where the host is located) and a host part (theaddress of the host on that network).Figure 24 IP Address: Network Part and Host PartIP addresses differ from Ethernet MAC addresses, which are uniquehardware-configured 48-bit addresses. A central agency, such as theInterNIC Registration Services mentioned above, assigns the network partof the IP address, and you assign the host part. All devices that areconnected to the same network share the same network part (also calledthe prefix).IP Addressnetwork host32 bitsThe boundary between networkand host parts depends on theclass of IP network.dua1730-0bAA03.book Page 102 Monday, July 11, 2005 11:14 AM