Reference Guide

B-8 User’s Reference Guide
Macintosh workstation (Open Transport Version 1.1 or later):
■ The Mac workstation requests and renews its lease every half hour.
■ The Mac workstation relinquishes its address upon shutdown in all but one case. If the TCP/IP control
panel is set to initialize at startup, and no IP services are used or the TCP/IP control panel is not opened,
the DHCP address will NOT be relinquished upon shutdown. However, if the TCP/IP control panel is opened
or if an IP application is used, the Mac WILL relinquish the lease upon shutdown.
■ If the TCP/IP control panel is set to acquire an address only when needed (therefore a TCP/IP application
must have been launched to obtain a lease) the Mac WILL relinquish its lease upon shutdown every time.
Netopia R6000 Series DHCP server characteristics
■ The Netopia R6000 Series ignores any lease-time associated with a DHCP request and automatically
issues the DHCP address lease for one hour.
■ The number of devices a Netopia R6000 Series can serve DHCP to is 512. This is imposed by global limits
on the size of the address serving database, which is shared by all address serving functions active in the
router.
■ The Netopia R6000 Series 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 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 server.
MacIP serving
Macintosh workstation (MacTCP or Open Transport):
Once the Mac workstation requests and receives a valid address, the Netopia R6000 Series actively checks for
the workstation’s existence once every minute.
■ For a dynamic address, the Netopia R6000 Series 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 R6000 Series releases the address back to the address pool after it has
lost contact with the Mac workstation for over 20 minutes.
Netopia R6000 Series MacIP server characteristics
The Mac workstation uses ATP to both request and receive an address from the Netopia R6000 Series's MacIP
server. Once acquired, NBP confirm packets will be sent out every minute from the Netopia R6000 Series 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 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.