ADSL Router User Manual
Firewall
The firewall is a kind of software that interrupts the data between the Internet and your computer. It is the TCP/IP equivalent of a security gate at the entrance to your company. All data must pass through it, and the firewall (functions as a security guard) will allow only authorized data to be passed into the LAN.
What the firewall can do? It can:
deny or permit any packet from passing through explicitly
distinguish between various interfaces and match on the following fields:
source and destination IP address
port
To keep track of the performance of IP Filter, a logging device is used. The device supports logging of the TCP/UDP and IP packet headers and the first 129 bytes of the packet (including headers) whenever a packet is successfully passed through or blocked, and whenever a packet matches a rule being setup for suspicious packets.
An example for firewall setup:
This picture shows the most common and easiest way to employ the firewall. Basically, you can install a
For the security of your router, set the firewall is an important issue.
Firewall – IP Filtering
This page allows you to specify the IP packet filtering rules to prevent the services accessed from the Internet hosts or limit the Internet access for local hosts.
Choose Disabled to disable the firewall function. Click Enabled to invoke the settings that you set in this web page.
To initiate the IP Filtering, select the Enabled radio button and click Apply.
Select the direction to filter packets: Inbound means the data is transferred from outside onto your computer. Outbound means the data is transferred from your computer onto outside through Internet. Please choose Outbound traffic or Inbound traffic as the direction for filtering packets.
Click Add to add a new IP Filtering rule.
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