Monoprice PID 8743 Wireless N ADSL2 Modem and Router 802 11N WPS Function 2T2R 300Mbps - Manual (Page 87)

ADSL2/2+ Router
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Click “Apply/Save” to display the current configured static route
information.

IP version: It is used to indicate that the IP belongs to IPv4.

Destination IP address/prefix length: to identify the destination
IP address or network that the data is sending to. Prefix length
together with the destination IP address are used to identify the
destination network.