Monoprice PID 8743 Wireless N ADSL2 Modem and Router 802 11N WPS Function 2T2R 300Mbps - Manual (Page 88)

ADSL2/2+ Router
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Interface: the interface the data is sending to

Gateway IP address: the IP address of the router or host the
data packets are sending to.

Metric: the number of the routers that the data packets go
through (optional).

Apply /Save：Complete the settings.
Note:

Destination IP address cannot be at the same net segment with
the IP addresses of the router’s WAN or LAN port.

We recommend using the default settings if there is no special
requirement, for inappropriate or incorrect route setting would
cause network malfunction.
4.2.12 DNS
DNS server
DNS server is used to map the domain name and it can be
automatically obtained when you connect to the ISP or it can also be
manually configured.