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Firewall
The
ADSL Router
’s firewall inspects packets at the application layer,
maintains TCP and UDP session information including time-outs and the
number of active sessions, and provides the ability to detect and prevent
certain types of network attacks.
Network attacks that deny access to a network device are called
Denial-of-Service (DoS) attacks. DoS attacks are aimed at devices and
networks with a connection to the Internet. Their goal is not to steal
information, but to disable a device or network so users no longer have
access to network resources.
The
ADSL Router
firewall function protects against the following DoS
attacks: IP Spoofing, Land Attack, Ping of Death, IP with zero length,
Smurf Attack, UDP port loopback, Snork Attack, TCP null scan, and TCP
SYN flooding. (See
page 4-45 for details.)
The firewall does not significantly affect system performance, so we advise
leaving it enabled to protect your network. Select Enable and click the
“
SAVE SETTINGS
” button to open the Firewall submenus.
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Access Control
Access Control allows users to define the outgoing traffic permitted or
not-permitted through the WAN interface. The default is to permit all
outgoing traffic.
The following items are on the Access Control screen:
Parameter
Description
Enable Filtering
Function
Click Yes to turn on the filtering function.
Normal Filtering Table
Displays the IP address (or an IP address range) filtering
table.
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To add the PC to the filtering table:
1.
Click “Add PC” on the Access Control screen.
2.
Define the appropriate settings for client PC services.
3.
Click “OK” and then click “
SAVE SETTINGS
” to save your settings.
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MAC Filter
The ADSL Router can also limit the network access based on the MAC
address. The MAC Filtering Table allows the ADSL Router to enter up to
32 MAC addresses that are not allowed access to the WAN port.
Click Yes to enable, or No to disable this function.
Enter the MAC address in the space provided.
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URL Blocking
The ADSL Router allows the user to block access to web sites by entering
either a full URL address or just a keyword. This feature can be used to
protect children from accessing violent or pornographic web sites.
You can define up to 30 sites here.
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