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IP Setup 6-17
press COMMIT in the Add or Change Key screen, then press Escape three times to return to the Add or
Change Connection Profile screen.
■ Select COMMIT in the Connection Profile screen and press Return. Your changes become effective for the
specified Connection Profile.
Power interruptions
Netopia 4000 Series routers use NTP updates to set the correct time. Consequently, the starting time after a
power cycle, whether from power failure or deliberately switching power off and on, is in the year 1904. This
could invalidate some keys that would otherwise be valid. To prevent this, if the system time is before the year
2000, all keys are considered valid regardless of their specified date and time ranges.
IP Address Serving
In addition to being a router, the Router is also an IP address server. There are three protocols it can use to
distribute IP addresses.
■ The first, called Dynamic Host Configuration Protocol (DHCP), is widely supported on PC networks, as well
as Apple Macintosh computers using Open Transport and computers using the UNIX operating system.
Addresses assigned via DHCP are “leased” or allocated for a short period of time; if a lease is not
renewed, the address becomes available for use by another computer. DHCP also allows most of the IP
parameters for a computer to be configured by the DHCP server, simplifying setup of each machine.
■ The second, called BootP (also known as Bootstrap Protocol), is the predecessor to DHCP and allows older
IP hosts to obtain most of the information that a DHCP client would obtain. However, in contrast, BootP
address assignments are “permanent” since there is no lease renewal mechanism in BootP.
■ The third protocol, called Dynamic WAN, is part of the PPP/MP suite of wide area protocols used for WAN
connections. It allows remote terminal adapters and NAT-enabled routers to be assigned a temporary IP
address for the duration of their connection.
Since no two hosts can use the same IP address at the same time, make sure that the addresses distributed
by the Router and those that are manually configured are not the same. Each method of distribution must have
its own exclusive range of addresses to draw from.
Main
Menu
System
IP Address
Configuration
Serving
• Serve DHCP Clients
• Serve BootP Clients
• Serve Dynamic WAN Clients