Operation Manual

28 AT-AR256E v3 - 4 Ports ADSL2/2+ Router - User Manual
Universal Plug and Play (UPnP)
Universal Plug and Play (UPnP) is a set of computer network protocols allow devices to connect
seamlessly and to simplify the implementation of networks in the home (data sharing, communications, and
entertainment) and corporate environments.
Figure 18: UPnP
To enable UPnP check the ‘enable UPNP’ checkbox, then Apply.
Simple Network Time Protocol
Simple Network Time Protocol (SNTP) is a protocol used to synchronize the system time to the public
SNTP servers. It uses the UDP protocol on port 123 to communicate between clients and servers.
Figure 19: SNTP
To enable SNTP:
1. Check Enable SNTP.
2. Configure the following fields:
 Primary SNTP Server The IP address or host name of the primary SNTP server. This can be
provided by the ISP or defined by a user.