DSL-504T DSL Router User’s Guide
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When DoS, Port Scan, or Service Filtering Protection is enabled, it will create a firewall policy to protect
your network against the following:
Dos Protection
Port Scan Protection
Service Filtering
•
SYN Flood check
•
ICMP Redirection
check
•
FIN/URG/PSH attack
•
Xmas Tree attack
•
Null Scan attack
•
SYN/RST attack
•
SYN/FIN attack
•
Ping from External Network
•
Telnet from External Network
•
FTP from External Network
•
DNS from External Network
•
IKE from External Network
•
RIP from External Network
•
DHCP from External Network
•
ICMP from LAN
A DoS "denial-of-service" attack is characterized by an explicit attempt by attackers to prevent legitimate
users of a service from using that service. Examples include: attempts to "flood" a network, thereby
preventing legitimate network traffic, attempts to disrupt connections between two machines, thereby
preventing access to a service, attempts to prevent a particular individual from accessing a service, or,
attempts to disrupt service to a specific system or person.
Port scan protection is designed to block attempts to discover vulnerable ports or services that might be
exploited in an attack from the WAN.
The Service Filtering options allow you to block FTP, Telnet response, Pings, etc, from the external
network. Check the category you want to block to enable filtering of that type of packet.
When you have selected the desired Firewall policies, click the Apply button to enforce the policies.
Remember to save any configuration changes.
Summary of Contents for DSL-504T
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