B-8 Administration Guide The Netopia 4741 releases the DHCP address back to the available DHCP address pool exactly one hourafter the last-heard lease request. Some other DHCP implementations may hold on to the lease for anadditional time after the lease expired to act as a buffer for variances in clocks between the client andserver.MacIP servingMacintosh workstation (MacTCP or Open Transport):Once the Mac workstation requests and receives a valid address, the Netopia 4741 actively checks for theworkstation’s existence once every minute. For a dynamic address, the Netopia 4741 releases the address back to the address pool after it has lostcontact with the Mac workstation for over 2 minutes. For a static address, the Netopia 4741 releases the address back to the address pool after it has lostcontact with the Mac workstation for over 20 minutes.Netopia 4741 MacIP server characteristicsThe Mac workstation uses ATP to both request and receive an address from the Netopia 4741's MacIP server.Once acquired, NBP confirm packets will be sent out every minute from the Netopia 4741 to the Macworkstation.Manually distributing IP addressesIf you choose to manually distribute IP addresses, you must enter each computer’s address into its TCP/IPstack software. Once you manually issue an address to a computer, it possesses that address until youmanually remove it. That’s why manually distributed addresses are called static addresses.Static addresses are useful in cases when you want to make sure that a host on your network cannot have itsaddress taken away by the address server. Appropriate candidates for a static address include a networkadministrator’s computer, a computer dedicated to communicating with the Internet, and routers.Using address servingThe Netopia 4741 provides three ways to serve IP addresses to computers on a network. The first, DynamicHost Configuration Protocol (DHCP), is supported by PCs with Microsoft Windows and a TCP/IP stack.Macintosh computers using Open Transport and computers using the UNIX operating system may also be ableto use DHCP. The second way, MacIP, is for Macintosh computers. The third way, called Serve Dynamic WANClients (IPCP), is used to fulfill WAN client requirementsThe Netopia 4741 can use both DHCP and MacIP. Whether you use one or both depends on your particularnetworking environment. If that environment includes both PCs and Macintosh computers that do not use OpenTransport, you need to use both DHCP and MacIP to distribute IP addresses to all of your computers.Serve dynamic WAN clientsThe third method, used to fulfill WAN client requirements, is called Serve Dynamic WAN Clients. The correctterm or protocol is a subset of the PPP suite call IPCP. Originally, this would apply only to switched WANinterface routers, and not to leased line routers. However, a new feature can give you Asynchronous PPP dial-insupport on the Auxiliary port on any router including leased line Netopia routers.
