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Understanding IP Addressing B-7
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This section describes the specific IP address lease, renew, and release mechanisms for both the Mac and PC,
with either DHCP or MacIP address serving.
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Windows 95 workstation:
■The Win95 workstation requests and renews its lease every half hour.
■The Win95 workstation does NOT relinquish its DHCP address lease when the machine is shut down.
■The lease can be manually expired using the WINIPCFG program, a command line program executable from
the DOS prompt or from the START:RUN menu, on a Windows 95 or 98 machine.
Windows 3.1 workstation (MSTCP Version 3.11a):
■The Win3.1 workstation requests and renews its lease every half hour.
■The Win3.1 workstation does NOT relinquish its DHCP address lease when the user exits Windows and
goes to DOS.
■The lease can be manually expired by typing IPCONFIG/RELEASE from a DOS window within Windows or
from the DOS prompt.
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.
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■The Netopia R5000 Series Router 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 R5000 Series Router can serve DHCP to is 512. This is imposed by
14-29 255.255.255.224
30-61 255.255.255.192
62-125 255.255.255.128
125-259 255.255.255.0
Number of Devices (other than
Netopia R5000 Series Router) on
Local Network
Largest Possible Ethernet Subnet
Mask