ÂIf you don’t want your wireless device to share its IP address, choose “Off (Bridge Mode).” If you set up your device in bridge mode, AirPort computers have access to all services on the Ethernet network, and the device does not provide Internet sharing services. See “You’re Using an Existing Ethernet Network” on page 37 for more information about setting up your wireless device as a bridge.

Using the wireless device as a bridge can be a way to address incompatibilities between the device’s Internet sharing features and your ISP’s connection method.

Setting DHCP and NAT Options

If you chose “Share a public IP address” from the Connection Sharing pop-up menu, you can set DHCP and NAT options. Click DHCP.

ÂChoose a range of IP addresses from the DHCP Range pop-up menu. Choose 10.0, 192.168, or 172.16 and then enter a beginning and ending address in the DHCP Beginning Address and the DHCP Ending Address fields, depending on which addresses you want the wireless device to provide.

ÂEnter a number in the DHCP Lease field, and then choose minutes, hours, or days from the pop-up menu.

ÂType a welcome message in the DHCP Message field. This message is displayed when a computer joins your network.

ÂIf your network is set up to use a Lightweight Directory Access Protocol (LDAP) server on your network, you can enter the address of the server in the LDAP Server field, and computers on your network will have access to it.

Chapter 3 AirPort Network Designs

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Apple AirPort Networks manual Setting Dhcp and NAT Options