Assigning Dns Addresses; Configuring Dns Relay - Asus SL6000 User Manual

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Chapter 6

6.3.2 Assigning DNS Addresses

Multiple DNS addresses are useful to provide alternatives when one of the
servers is down or is encountering heavy traffic. ISPs typically provide primary
and secondary DNS addresses, and may provide additional addresses. Your
LAN PCs learn these DNS addresses in one of the following ways:
Statically: If your ISP provides you with their DNS server addresses, you can
assign them to each PC by modifying the PCs' IP properties.
Dynamically from a DHCP pool: You can configure the DHCP Server SL6000/
SL6300 and create an address pool that specify the DNS addresses to be
distributed to the PCs. Refer to the section Configuring DHCP Server for
instructions on creating DHCP address pools.
In either case, you can specify the actual addresses of the ISP's DNS servers
(on the PC or in the DHCP pool), or you can specify the address of the LAN
port on the VPN ADSL Router (e.g., 192.168.1.1). When you specify the LAN
port IP address, the device performs DNS relay, as described in the following
section.
Note: If you specify the actual DNS addresses on the PCs or in the
DHCP pool, the DNS relay feature is not used.

6.3.3 Configuring DNS Relay

When you specify the device's LAN port IP address as the DNS address, then
SL6000/SL6300 automatically performs "DNS relay"; i.e., because the device
itself is not a DNS server, it forwards domain name lookup requests from the
LAN PCs to a DNS server at the ISP. It then relays the DNS server's response
to the PC.
When performing DNS relay, the SL6000/SL6300 must maintain the IP
addresses of the DNS servers it contacts. It can learn these addresses in either
or both of the following ways:
Follow these steps to configure DNS relay:
1. Enter LAN IP in the DNS Server IP Address field in DHCP configura-
tion page as shown in Figure 6.2.
2. Configure the LAN PCs to use the IP addresses assigned by the DHCP
server on SL6000/ SL6300, or enter SL6000/SL6300's LAN IP address
as their DNS server address manually for each PC on your LAN.
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