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DSL-504T DSL Router User’s Guide
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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.
NAT
Network Address Translation (NAT) may be disabled on the Router. This should only be disabled if
there are specific reasons to do so. When NAT is disabled on the Router it is not possible to allow
more that one computer or server (any single IP address on the LAN) to access the Internet unless
some form of NAT is provided by another system.
NAT can be enabled or disabled system-wide. If you are using multiple connections (Multiple PVCs)
the status of NAT will be the same for all IP routed connections.
NAT Enable/Disable Menu
To disable or enable NAT, select the desired option Enabled or Disabled from the pull-down menu
and click the Apply button.