User's Manual

Chapter9 NEOBIT 1014VA ADSL Router User’s Guide
Configuring DNS Relay
When you specify the device's LAN port IP address as the DNS
address, then the ADSL/Ethernet 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 NEOBIT 1014VA must maintain
the IP addresses of the DNS servers it contacts. It can learn these
addresses in either or both of the following ways:
 Learned through PPP: If the device uses a PPP
connection to the ISP, the primary and secondary DNS
addresses can be learned via the PPP protocol. To use this
method, the "Use DNS" checkbox must be selected in the
PPP interface properties. (See Chapter 13 for instructions
on configuring your PPP interface. Note that you cannot
change this property by modifying an existing PPP
interface; you must delete the interface and recreate it with
the new setting.)
Using this option provides the advantage that you will not
need to reconfigure the PCs or the ADSL Router if the ISP
changes their DNS addresses.
 Configured on the ADSL Router: You can use the
device's DNS feature to specify the ISP's DNS addresses.
If the device also uses a PPP interface with the "Use
DNS" property enabled, then these configured addresses
will be used in addition to the two addresses learned
through PPP. If "Use DNS" is not enabled, or if a protocol
other than PPP is used (such as EoA), then these
configured addresses will be used as the primary and
secondary DNS addresses.
Follow these steps to configure DNS relay:
1. Configure the LAN PCs to use the ADSL Router's LAN IP
address as their DNS server address—by assigning the LAN
IP address statically to each PC, or by inputting the LAN IP
address or the address 0.0.0.0 as the DNS address in the
DHCP server pool used by the PCs.
2. If using a PPP connection to the ISP, click the "Use DNS"
check box so that the DNS server addresses it learns are
used for DNS relay.
Or, ...
If not using a PPP connection (or if you want to specify DNS
addresses in addition to those learned through PPP),
configure the DNS addresses on the ADSL Router as
follows: