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Item Description
Protocol Specifies the protocol the rule applies to:
• all – The rule applies to all protocols.
• TCP – The rule applies to TCP protocol.
• UDP – The rule applies to UDP protocol.
• ICMP/ICMPv6 – The r ule applies to ICMP protocol. In IPv6
Firewall Configuration there is the ICMPv6 option.
Target Port The port number where the rule is used.
Action Specifies the rule – the type of action the router performs:
• allow – The router allows the packets to enter the network.
• deny – The router denies the packets from entering the net-
work.
Table 36: Forwarding filtering
When you enable the Enable filtering of locally destined packets function, the router drops
the packets requesting an unsupported service. The packet is dropped automatically without
any information.
As a protection against DoS attacks, the Enable protection against DoS attacks limits the
number of allowed connections per second to five. The DoS attack floods the target system
with meaningless requirements.
4.9.1 Example of the IPv4 Firewall Configuration
The router allows the following access:
• From IP address 171.92.5.45 using any protocol.
• From IP address 10.0.2.123 using the TCP protocol on port 1000.
• From IP address 142.2.26.54 using the ICMP protocol.
See the network topology and configuration form in the Figures below.
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