Configuration manual

Chapter 2 SMT menu 1 - general setup 49
Nortel Business Secure Router 222 Configuration — Advanced
First system
DNS server
Second system
DNS server
Third system
DNS server
DNS (Domain Name System) is for mapping a domain
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 you can access it. The Business Secure Router
uses a system DNS server (in the order you specify
here) to resolve domain names for VPN, DDNS and
the time server.
Press [SPACE BAR] and then [ENTER] to select an
option. Select From ISP if your ISP dynamically
assigns DNS server information (and the Business
Secure 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 Business Secure 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.
Table 4 General setup menu fields
Field Description Example