D-Link HorstBox DVA-G3342SD Manual page 111

5.6 Firewall
DoS Scans
Port scans are a popular method to detect vulnerable points in
your network.
A port scanner either tries to connect to a service (connect scan)
or tries to retrieve information about a computer's active services
from the answers on invalid packets (stealth scan). A port scan
sending a great number of packets can be considered a DoS
attack as well.
With SYN flooding the offender attempts to overload the target
system with a great number of faked connection requests via the
TCP protocol. This may hinder the server to answer requests
from legal clients. You can limit the number of SYN packets the
HorstBox accepts.
Figure 5.18: Firewall options: DoS Scans
To save the settings, click on S
To discard all recent entries click on D
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