If the destination IP is 10.1.2.0, Subnet mask should be 255.255.255.0
4.3.9 System Tool
Under "System Tool", there are 8 sub-items. They are Time Setting,
Dynamic DNS (DDNS), Backup/ Resume settings, Upgrade, Restore
factory settings, Restart, Password and System Log. Click the
sub-item, you are able to have respective configuration. Below is the
detailed introduction.
4.3.9.1 Time Setting
You would choose the time zone according to your location. When
connected to Internet, you would obtain GMT time.
4.3.9.2 DDNS
TEI480T/490T/4000 Enterprise & Net-bar Level Router
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