Nortel BCM50a Configuration Manual page 60

60 Chapter 4 LAN setup
Table 8 DHCP Ethernet setup menu fields
Field
Size of Client IP
Pool
First DNS Server
Second DNS
Server
Third DNS Server
N0115791
Description
This field specifies the size or count of the IP
address pool.
The BCM50a Integrated Router passes a DNS
(Domain Name System) server IP address (in the
order you specify here) to the DHCP clients.
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 chose 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. Enter the DNS server's IP address in
the IP Address field below. If you chose
User-Defined, but leave the IP address set to
0.0.0.0, User-Defined changes to None after you
save your changes. If you set a second choice to
User-Defined, and enter the same IP address, the
second User-Defined changes to None after you
save your changes.
Select DNS Relay to have the BCM50a Integrated
Router act as a DNS proxy. The BCM50a Integrated
Router's LAN IP address displays in the IP Address
field below (read-only). The BCM50a Integrated
Router tells the DHCP clients on the LAN that the
BCM50a Integrated Router itself is the DNS server.
When a computer on the LAN sends a DNS query to
the BCM50a Integrated Router, the BCM50a
Integrated Router forwards the query to the
BCM50a Integrated Router's system DNS server
(configured in the SYSTEM General screen) and
relays the response back to the computer. You can
only select DNS Relay for one of the three servers;
if you select DNS Relay for a second or third DNS
server, that choice 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 DNS server, you
must know the IP address of a machine in order to
access it.
Example
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