NetComm NB712 manual Click Advanced Firewall Security and then press Finish, SYN Attack

Advanced Firewall Security

You can determine the security level for special purpose, environment, and applications by configuring DoS protection and defining an extra packet filter with higher priority than the default SPI filter. Note that an improper filter policy may degrade the capability of the firewall and/or even block the normal network traffic.

Click Advanced Firewall Security and then press Finish.

SYN Attack:	A SYN flood attack attempts to slow your network by
	requesting new connections but not completing the process
	to open the connection. Once the buffer for these pending
	connections is full a server will not accept any more
	connections and will be unresponsive.
ICMP Flood:	A sender transmits a volume of ICMP request packets to
	cause all CPU resources to be consumed serving the phony
	requests.
UDP Flood:	A sender transmits a volume of requests for UDP diagnostic
	services which cause all CPU resources to be consumed
	serving the phony requests.

50	NB712 / NB714 User Guide
	YML829 Rev1