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Chapter 13 Firewall
EMG5324-D10A User’s Guide
183
13.5 The DoS Screen
DoS (Denial of Service) attacks can flood your Internet connection with invalid packets and
connection requests, using so much bandwidth and so many resources that Internet access
becomes unavailable.
Use the DoS screen to activate protection against DoS attacks. Click Security > Firewall > DoS
to display the following screen.
Figure 91 Security > Firewall > DoS
The following table describes the labels in this screen.
13.6 Firewall Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
Source/
Destination Port
These fields are displayed if you select TCP or UDP as the IP port.
Select Single to specify one port only or Range to specify a span of ports that define your
customized service. If you select Any, the service is applied to all ports.
Type a single port number or the range of port numbers that define your customized
service.
Policy Use the drop-down list box to select whether to discard (DROP), deny and send an ICMP
destination-unreachable message to the sender of (REJECT) or allow the passage of
(ACCEPT) packets that match this rule.
Direction Use the drop-down list box to select the direction of traffic to which this rule applies.
Apply Click Apply to save your changes.
Cancel Click Cancel to exit this screen without saving.
Table 56 Access Control: Add/Edit (continued)
LABEL DESCRIPTION
Table 57 Security > Firewall > DoS
LABEL DESCRIPTION
DoS Protection
Blocking
Select Enable to enable protection against DoS attacks.
Apply Click Apply to save your changes.
Cancel Click Cancel to exit this screen without saving.