Netopia R2121 - Manual (Page 236)

C-8 User’s Reference Guide
one hour after the last heard lease request as some other DHCP implementations may hold on to the lease
for an additional time after the lease expired, to act as a buffer for variances in clocks between the client
and ser ver.
MacIP Serving
Macintosh Workstation (MacTCP or Open Transpor t):
Once the Mac workstation requests and receives a valid address, the Netopia R2121 will actively check for the
workstation’s existence once ever y minute.
■ For a DYNAMIC address, the Netopia R2121 will release the address back to the address pool after it has
lost contact with the Mac workstation for over 2 minutes.
■ For a STATIC address, the Netopia R2121 will release the address back to the address pool after it has
lost contact with the Mac workstation for over 20 minutes.
Netopia R2121 MacIP Server Characteristics
The Mac workstation uses ATP to both request and receive an address from the Netopia R2121's MacIP ser ver.
Once acquired, NBP confirm packets will be sent out ever y minute from the Netopia R2121 to the Mac
workstation.
Manually distributing IP addresses
If you choose to manually distribute IP addresses, you must enter each computer’s address into its TCP/IP
stack software. Once you manually issue an address to a computer, it possesses that address until you
manually remove it. That’s why manually distributed addresses are sometimes called static addresses.
Static addresses are useful in cases when you want to make sure that a host on your network cannot have its
address taken away by the address ser ver. A network administrator’s computer, a computer dedicated to
communicating with the Internet, and routers are appropriate candidates for a static address.
Using address serving
The Netopia R2121 provides three ways to ser ve IP addresses to computers on a network. The first, Dynamic
Host Configuration Protocol (DHCP), is suppor ted by PCs with Microsoft Windows and a TCP/IP stack.
Macintosh computers using Open Transpor t and computers using the UNIX operating system may also be able
to use DHCP. The second way, MacIP, is for Macintosh computers. The third way, called Ser ve Dynamic WAN
Clients (IPCP), is used to fulfill WAN client requirements
The Netopia R2121 can use both DHCP and MacIP. Whether you use one or both will depend on your par ticular
networking environment. If that environment includes both PCs and Macintosh computers that do not use Open
Transpor t, you will need to use both DHCP and MacIP to distribute IP addresses to all of your computers.
Serve dynamic WAN clients
The third method, used to fulfill WAN client requirements, is called Ser ve Dynamic WAN Clients. This is a subset
of PPP. Originally, this would apply only to switched WAN inter face routers, and not to leased line routers.
However, a new feature can give you Asynchronous PPP dial-in suppor t on the Auxiliar y por t on any router
including leased line Netopia routers.