3Com SuperStack 3 3870 Getting Started Manual

Also see for 3CR17450-91: Datasheet Getting started guide

Contents

54 CHAPTER 4: P ROBLEM SOLVINGThe IP address is split into two parts:■ The first part (‘192.168.100’ in the example) identifies the network onwhich the device resides■ The second part (‘.8’ in the example) identifies the device within thenetworkThe natural subnet mask for this example is 255.255.255.0.If your network has a connection to the external IP network, that is, youaccess the Internet, you must apply for a registered IP address.How to Obtain a Registered IP AddressThe IP registration system ensures that every IP address used is unique; ifyou do not have a registered IP address, you may be using an identicaladdress to someone else and your network will not operate correctly.InterNIC Registration Services is the organization responsible forsupplying registered IP addresses. To learn more about InterNIC, visit theirWeb site at www.internic.net.If your IP network is internal to your organization only, that is, you do notaccess the Internet, you may use any arbitrary IP address as long as it isnot being used by another device on your network. 3Com suggests youuse addresses in the range 192.168.0.0 to 192.168.255.255 with asubnet 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.