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B-8 User’s Reference Guide
global limits on the size of the address serving database, which is shared by all address serving functions
active in the router.
■ The Netopia R5000 Series Router releases the DHCP address back to the available DHCP address pool
exactly one hour after the last-heard lease request. Some other DHCP implementations may retain the
lease for an additional time after the lease expired. This is intended to act as a buffer for variances in
clocks between the client and server.
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Macintosh workstation (MacTCP or Open Transport):
Once the Mac workstation requests and receives a valid address, the Netopia R5000 Series Router actively
checks for the workstation’s existence once every minute.
■ For a dynamic address, the Netopia R5000 Series Router releases 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 R5000 Series Router releases the address back to the address pool after
it has lost contact with the Mac workstation for over 20 minutes.
Netopia R5000 Series Router MacIP server characteristics
The Mac workstation uses ATP to both request and receive an address from the Netopia R5000 Series Router's
MacIP server. Once acquired, Name Binding Protocol (NBP) confirm packets will be sent out every minute from
the Netopia R5000 Series Router to the Mac workstation.
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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 server. Appropriate candidates for a static address include: a network
administrator’s computer, a computer dedicated to communicating with the Internet, and routers.
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The Netopia R5000 Series Router provides three ways to serve IP addresses to computers on a network. The
first, Dynamic Host 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 able to use DHCP. The second way, MacIP, is for Macintosh computers. The third way, called Serve Dynamic
WAN Clients (IPCP), is used to fulfill WAN client requirements
The Netopia R5000 Series Router can use both DHCP and MacIP. Whether you use one or both depends on
your particular networking environment. If that environment includes both PCs and Macintosh computers that
do not use Open Transport, you need to use both DHCP and MacIP to distribute IP addresses to all of your
computers.