The Dos Screen - ZyXEL Communications VMG8924-B10D User Manual

Table 84 Access Control: Add/Edit (continued)
LABEL
Custom
Destination Port
Policy
Direction
Enable Rate
Limit
Scheduler Rules
Apply
Cancel

17.5 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 110 Security > Firewall > DoS
The following table describes the labels in this screen.
Table 85 Security > Firewall > DoS
LABEL
DoS Protection
Blocking
Apply
Cancel
Chapter 17 Firewall
DESCRIPTION
This field is displayed only when you select Specific Protocol in Select Protocol.
Enter a single port number or the range of port numbers of the destination.
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.
Use the drop-down list box to select the direction of traffic to which this rule applies.
Select this check box to set a limit on the upstream/downstream transmission rate for the
specified protocol.
Specify how many packets per minute or second the transmission rate is.
Select a schedule rule for this ACL rule form the drop-down list box. You can configure a new
schedule rule by click Add New Rule. This will bring you to the Security > Scheduler Rules screen.
Click Apply to save your changes.
Click Cancel to exit this screen without saving.
DESCRIPTION
Select Enable to enable protection against DoS attacks.
Click Apply to save your changes.
Click Cancel to exit this screen without saving.
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