Internet Security Router User’s Manual Chapter 5. Configuring LAN Settings255 Configuring LAN SettingsThis chapter describes how to configure LAN properties for the LAN interface on the Internet Security Routerthat communicates with your LAN computers. You’ll learn to configure IP address, DHCP and DNS server foryour LAN in this chapter.5.1 LAN IP AddressIf you are using the Internet Security Router with multiple PCs on your LAN, you must connect the LAN via theEthernet ports on the built-in Ethernet switch. You must assign a unique IP address to each device residing onyour LAN. The LAN IP address identifies the Internet Security Router as a node on your network; that is, its IPaddress must be in the same subnet as the PCs on your LAN. The default LAN IP for the Internet SecurityRouter is 192.168.1.1.DefinitionA network node can be thought of as any interface where adevice connects to the network, such as the Internet SecurityRouter’s LAN port and the network interface cards on your PCs.See Appendix 13 for an explanation of subnets.You can change the default to reflect the set of IP addresses that you want to use with your network.NoteThe Internet Security Router itself can function as a DHCP serverfor your LAN computers, as described in section 5.2.3 ConfiguringDHCP Server, but not for its own LAN port.5.1.1 LAN IP Configuration ParametersTable 5.1describes the configuration parameters available for LAN IP configuration.Table 5.1. LAN IP Configuration ParametersSetting DescriptionIP Address The LAN IP address of the Internet Security Router. This IP is used by yourcomputers to identify the Internet Security Router’s LAN port. Note that thepublic IP address assigned to you by your ISP is not your LAN IP address.The public IP address identifies the WAN port on the Internet Security Routerto the Internet.Subnet Mask The LAN subnet mask identifies which parts of the LAN IP Address refer toyour network as a whole and which parts refer specifically to nodes on thenetwork. Your device is preconfigured with a default subnet mask of255.255.255.0.5.1.2 Configuring the LAN IP AddressFollow these steps to change the default LAN IP address.1. Log into Configuration Manager as administrator, and then click the LAN menu.When the submenus of LAN Configuration displays, click IP submenu to display the IP Addressconfiguration page as shown in Figure 5.1.
