Zoom X5v Technical Reference page 32

Entry
DNS Proxy
Auto Discovery
User Configuration
DNS Server (user
configured)
32
Explanation
The default is Enabled, which means that your
X5v or V3 intercepts requests from computers on
the LAN for the IP addresses of domain names. If
the X5v or V3 can supply the IP addresses from
its own memory, it does so; otherwise, it forwards
the requests out to your ISP's DNS server.
This check box is selected by default, and directs
the X5v or V3 to use the DNS server address
assigned by your provider if it cannot resolve the
requested IP address from its own memory.
You must select either Auto Discovery or User
Configuration if DNS Proxy is enabled.
Select this check box if your service provider will
not automatically assign the DNS server and it
must be manually configured, or if you want to
specify an alternate DNS server in case the ISP's
server goes down.
If you have selected User Configuration (see
above), enter the IP address of a known DNS
server.
On the dropdown list choose Add. After you
click Save Changes and then Write Settings to
Flash and Reboot, the DNS server address will
be added to the DNS Proxy Setting table on this
page. You can configure multiple DNS servers.
To remove a DNS server, enter the server's
address and select Delete from the list.