Chapter 13 Firewall
LTE Series User’s Guide
191
13.6 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 144 Security > Firewall > DoS
IP Type Select between IPv4 or IPv6. Compared to IPv4, IPv6 (Internet Protocol version 6), is
designed to enhance IP address size and features. The increase in IPv6 address size to
128 bits (from the 32-bit IPv4 address) allows up to 3.4 x 1038 IP addresses. The Zyxel
Device can use IPv4/IPv6 dual stack to connect to IPv4 and IPv6 networks, and supports
IPv6 rapid deployment (6RD).
Select Service Select a service from the Select Service box.
Protocol Select the protocol (ALL, TCP/UDP, TCP, UDP, ICMP, or ICMPv6) used to transport the
packets for which you want to apply the rule.
Custom Source Port This is a single port number or the starting port number of a range that defines your rule.
Custom Destination
Port
This is a single port number or the ending port number of a range that defines your rule.
TCP Flag Select the TCP Flag (SYN, ACK, URG, PSH, RST, FIN).
Policy 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.
Direction 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.
Enable Rate Limit Click to enable (switch turns blue) the setting of maximum number of packets per
maximum number of minute/second to limit the throughput of traffic that matches this
rule. If not, the next item will be disabled.
Scheduler Rules
packet(s) per (1-512) Enter the maximum number of packets (1-512) per minute/second.
Add New Rule Select a schedule rule for this ACL rule from the drop-down list box. You can configure a
new schedule rule by clicking Add New Rule.
OK Click this to save your changes.
Cancel Click this to exit this screen without saving.
Table 70 Security > Firewall > Access Control > Add New ACL Rule (continued)
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