Specifications

EN
45
Firewall
The ADSL Modem Multiservices PSTN Voice’s firewall enables access control of
client PCs, blocks common hacker attacks, including 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. The firewall does not significantly affect system
performance and we advise leaving it enabled to protect your network.
Note: After you check the radio button in the ‘Enable or disable Firewall features’ field,
you must click the ‘SAVE SETTINGS’ button to display the list of firewall features.
Access Control
Access Control allows users to define the outgoing traffic permitted or not-permitted
through the WAN interface. In the example above, all incoming and outgoing emails
are blocked. The default is to permit all outgoing traffic. (See the following page for
details.)
The ADSL Modem Multiservices PSTN Voice can also limit the access of hosts within
the local area network (LAN). The MAC Filtering Table allows the ADSL Modem
Multiservices PSTN Voice to enter up to 32 MAC addresses that are not allowed
access to the WAN port.
The following items are displayed on the Access Control screen:
Parameter Description
Enable Filtering Enables or disables the filtering function. Function
Normal Filtering Table Displays the IP address (or an IP address range) filtering table.
Click Add PC on the Access Control screen to view the following page.