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50 NB712 / NB714 User Guide
YML829 Rev1
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.