Draytek VigorSwitch P2261 User Manual page 24

First, IP Address: as shown above, enter "192.168.1.226", for instance. For sure, an IP
address such as 192.168.1.x must be set on your PC.
Second, Subnet Mask: as shown above, enter "255.255.255.0". Any subnet mask such as
255.255.255.x is allowable in this case.
DNS:
The Domain Name Server translates human readable machine name to IP address. Every
machine on the Internet has a unique IP address. A server generally has a static IP address.
To connect to a server, the client needs to know the IP of the server. However, user
generally uses the name to connect to the server. Thus, the switch DNS client program
(such as a browser) will ask the DNS to resolve the IP address of the named server.
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VigorSwitch P2261 User's Guide