ZyXEL Communications X650 User Manual page 126

Wireless lan concurrent dual band gigabit router
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Here are descriptions of each setup item:
Ping of Death (1):
Discard Ping
From WAN (2):
Port Scan (3):
Sync Flood (4):
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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.
Ping is a common and useful tool to know
the connection status of a specified remote network
device, but some malicious intruders will 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 (but when you activate
this function, you will not be able to ping your own
router from Internet either).
Some malicious intruder may try to use a 'port scanner'
to know how many ports of your Internet IP address are
open and they can collect a lot of valuable information
by doing so. Check this box and the router will block all
traffics trying to scan your Internet IP address.
This is another kind of attack, which uses a lot of fake
connection requests to consume the memory of your
server and try to make your server become unusable.
Check this box and the router will filter out this kind of
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