Nortel BCM50a Configuration Manual page 47

Table 4 General setup menu fields
Field Description
First system DNS (Domain Name System) is for mapping a domain
DNS server name to its corresponding IP address and vice versa.
The DNS server is extremely important because without
it, you must know the IP address of a machine before
Second
you can access it. The BCM50a Integrated Router uses
system DNS
a system DNS server (in the order you specify here) to
server
resolve domain names for VPN, DDNS and the time
server.
Third system
Press [SPACE BAR] and then [ENTER] to select an
DNS server
option. Select From ISP if your ISP dynamically assigns
DNS server information (and the BCM50a Integrated
Router's WAN IP address). The IP Address field below
displays the (read-only) DNS server IP address that the
ISP assigns. If you chose From ISP, but the BCM50a
Integrated Router has a fixed WAN IP address, From
ISP changes to None after you save your changes. If
you select From ISP for the second or third DNS server,
but the ISP does not provide a second or third IP
address, From ISP changes to None after you save your
changes.
Select User-Defined if you have the IP address of a
DNS server. The IP address can be public or a private
address on your local LAN. Enter the DNS server's IP
address in the field to the right.
A User-Defined entry with the IP address set to 0.0.0.0
changes to None after you save your changes. A
duplicate User-Defined entry changes to None after you
save your changes.
Select None if you do not want to configure DNS
servers. If you do not configure a system DNS server,
you must use IP addresses when configuring VPN,
DDNS and the time server.
Select Private DNS if the DNS server has a private IP
address and is located behind a VPN peer. Enter the
DNS server IP address in the field to the right.
With a private DNS server, you must also configure the
first DNS server entry in SMT menu 3.1 to use DNS
Relay.
Chapter 2 SMT menu 1 - general setup 47
BCM50a Integrated Router Configuration — Advanced
Example