TD-8817 ADSL2+ Ethernet/USB Modem Router User Guide
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DNS Relay: If you want to disable this feature, you just need to set both Primary and
secondary DNS IP to 0.0.0.0. If you want to use DNS relay, you can setup DNS server IP
to 192.168.1.1 on their Computer. If not, the device will perform as no DNS relay.
Primary DNS Server: Type in your preferred DNS server.
Secondary DNS Server: Type in your preferred DNS server.
Note:
If Use Auto Discovered DNS Server Only is selected in DNS Relay, this router will
accept the first received DNS assignment from one of the PPPoA, PPPoE or
MER/DHCP enabled PVC(s) during the connection establishment. If Use User
Discovered DNS Server Only is selected in DNS Relay, it is necessary for you to enter
the primary and optional secondary DNS server IP addresses. After type in the address,
click SAVE button to save it and invoke it.
DHCP Relay: Select Relay, then you will see the next screen (shown in Figure 4-17), the
modem rout
er will work as a DHCP Relay. A DHCP relay is a computer that forwards DHCP
data between computers that request IP addresses and the DHCP server that assigns the
addresses. Each of the device's interfaces can be configured as a DHCP relay. If it is enabled,
the DHCP requests from local PCs will forward to the DHCP server runs on WAN side. To
have this function working properly, please run on Router mode only, disable the DHCP
server on the LAN port, and make sure the routing table has the correct routing entry.
Figure 4-17
DHCP Server IP for Relay Agent: Enter the DHCP server IP Address runs on WAN
side.
Note:
If you select Disabled, the DHCP function will not take effect.
4.3.3 6RD
IPv6 tunnel is a kind of transition mechanism to enable IPv6-only hosts to reach IPv4 services and
to allow isolated IPv6 hosts and networks to reach each-other over IPv4-only infrastructure before
IPv6 completely supplants IPv4. It is a temporary solution for networks that do not support native
dual-stack, where both IPv6 and IPv4 run independently.
As a type of IPv6 tunnel, 6RD is used in the situation that your WAN connection is IPv4 while LAN
connection is IPv6. Choose “Interface Setup→6RD” menu,and you will see the screen as shown
in Figure 4-18.
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