Dos - ZyXEL Communications NR Series User Manual

Table 80 Security > Firewall > Access Control > Add New ACL Rule (continued)
LABEL
Custom Source Port
Custom Destination
Port
TCP Flag
Policy
Direction
OK
Cancel

15.6 DoS

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 135 Security > Firewall > DoS
The following table describes the labels in this screen.
Table 81 Security > Firewall > DoS
LABEL
DoS Protection
Blocking
Apply
Cancel
Chapter 15 Firewall
DESCRIPTION
This is a single port number or the starting port number of a range that defines your rule.
This is a single port number or the ending port number of a range that defines your rule.
Select the TCP Flag (SYN, ACK, URG, PSH, RST, FIN).
This appears when you select TCP/UDP or TCP in the Protocol field.
Use the drop-down list box to select whether to discard (Drop), deny and send an ICMP
destination-unreachable message to the sender (Reject), or allow the passage of
(Accept) packets that match this rule.
Select WAN to LAN to apply the rule to traffic from WAN to LAN. Select LAN to WAN to
apply the rule to traffic from LAN to WAN. Select WAN to Router to apply the rule to traffic
from WAN to router. Select LAN to Router to apply the rule to traffic from LAN to router.
Click this to save your changes.
Click this to exit this screen without saving.
DESCRIPTION
Enable this to protect against DoS attacks. The Zyxel Device will drop sessions that surpass
maximum thresholds.
Click this to save your changes.
Click this to restore your previously saved settings.
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