User manual
Enable NTP client update — Select to get the time from NTP (Network
  Time Protocol).
NTP server — Select a server from the drop-down menu.
Click “Apply Change” to get the time from the Internet (if connected). 
2.5.5 Denial of Service
A denial-of-service
(DoS) attack is 
characterized by an 
explicit attempt by 
hackers to prevent 
legitimate users of a 
service from using 
that service.
Enable DOS 
Prevention — Select 
  to modify the
  function.
Enable Source IP
Blocking — Enter a source IP blocking time. 
2.5.6 System Log
This screen displays 
the system log and 
can be used to set 
the remote log server.
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