Zhone zNID-GPON-2402 Configuration Manual page 177

For this example we are defining the IP address for the downstream
interface, by selecting Static.
Figure 138: Selecting the fiber WAN interface for the VLAN
The other options are
– DHCP
– Unconfigured
c From the DNS Relay Source dropdown leave Default
For this example we are selecting Default
A DNS (Dynamic Name System) server provides the translation from
a public IP address upstream of the zNID to the private IP address
downstream from the zNID.
When set to Default, the DNS IP addresses acquired by the WAN
uplink interface (via DHCP client or PPPoE client) will be passed
down to the LAN side clients as part of the DHCP Offer. This option
is not valid if the WAN uplink IP is statically configured, because in
that case there are no DNS IPs acquired.
– Static
When set to Static, the DNS IP Addresses that will be passed
down to LAN side clients as part of the DHCP Offer must be
statically configured.
The IP address for the DNS relay sources are given in the
Primary DNS and Secondary DNS text boxes.
Deployment scenarios
zNID 24xx Series Configuration Guide
177