User manual
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Below are descriptions of the options: 
Ping of Death (1):   Ping of Death is a special packet, and it will 
cause certain computers to stop responding. 
Check this box and the router will filter this kind 
of packet out. 
Discard Ping      Ping is a common and useful tool for learning 
From WAN (2):    the connection status of a specified remote 
network device. A malicious intruder may try to 
fill your network bandwidth with a lot of PING 
request data packets to make your Internet 
connection become very slow, even unusable. 
Check this box and the router will ignore all 
inbound PING requests. When you activate this 
function, however, you will not be able to ping 
your own router from the Internet. 
Port Scan (3):    A malicious intruder may try to use a port 
scanner to learn how many ports of your 
Internet IP address are open. They can collect a 
lot of valuable information by doing so. Check 
this box and the router will block all traffic that is 
trying to scan your Internet IP address. 
Sync Flood (4):    This is another kind of attack that uses a lot of 
fake connection requests to consume the 
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