D-Link NetDefend DFL-CP310 User Manual page 258

Using SmartDefense
In this field... Do this...
M inimal MTU Type the minimum value allowed for the MTU field in IP packets sent by a
Si ze client.
An overly small value will not prevent an
might degrade performance and cause legitimate requests to be dropped.
The default value is 300.
Port Scan
An attacker can perform a port s
vulnerable to an attack. This is most commonly done by attempting to access a port
and waiting for a response. The respo
This category includes the following ty
• Host Port Scan. The attacker scans a specific host's ports to determine
w hich of the ports are
• Sweep S
can. The attacker scans various hosts to determine where a speci
port is o pen.
You can configure how the NetDefend fire
detected.
242
can to determine whether ports are open and
nse indicates whether or not the port is open.
pes of port scans:
open.
wall should react when a port scan is
attack, while an overly large value
D-Link NetDefend firewall User Guide
fic