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Figure 4-22: Bridge Filtering Screen
DNS Configuration
The DNS Configuration page allows you to set the configuration of DNS proxy.
ADE-4000 supports the DNS proxy function. For the DHCP requests from local
PCs, the DHCP server will set the LAN port IP as the default DNS server. Thus, all
DNS query messages will come into LAN port first. The DNS proxy on the ADSL
modem recorded the available DNS servers, and forward DNS query messages to
one of DNS server.
Four DNS proxy modes available in ADE-4000:
Disable DNS Proxy
The LAN port does not process the DNS query message. For the DHCP requests
from local PCs, the DHCP server will set the user-configured preferred DNS sever
or alternate DNS server whichever is available as the DNS server. Then all DNS
query messages will be directly sent to the DNS servers.
Use Auto Discovered DNS Servers Only
The DNS proxy will store the DNS server IP addresses obtained from DHCP client
or PPP into the table. And all DNS query messages will be sent to one of the dy-
namically obtained DNS servers.
Use User Configured DNS Servers Only
The DNS proxy will use the user-configured preferred DNS server and alternate
DNS server. And all DNS query message will be sent to one of DNS servers.
Auto Discovery + User Configured
The DNS proxy’s table has all the IP addresses of dynamically obtained and user
configured DNS servers.
Figure 4-23: DNS Configuration Screen
Note: Before the DNS proxy mode is enabled; please go to the Miscellaneous
Configuration to enable the DNS proxy. Otherwise, DNS Proxy selection will
not be valid.