3Com SuperStack 3 4900 SX Getting Started Manual

Also see for 3C17702 - SuperStack 3 Switch 4900 SX: Datasheet Getting started guide Getting started guide

Managing a Switch Over the Network 31The IP address can be split into two parts: The first part (‘192.168’ in the example) identifies the network onwhich the device resides. The second part (‘100.8’ in the example) identifies the device withinthe network.If your network is internal to your organization only, you may use anyarbitrary IP address. We suggest you use addresses in the series192.168.100.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.netSubnets and Using aSubnet MaskYou can divide your IP network into sub-networks also known as subnets.Support for subnets is important because the number of bits assigned tothe device part of an IP address limits the number of devices that may beaddressed on any given network. For example, a Class C address isrestricted to 254 devices.If you have a small network (less than 254 devices), you may decide notto have multiple subnets.17702ua.bk Page 31 Friday, April 6, 2001 3:31 PM