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myGuard 7500GL 802.11g Security ADSL Router
Chapter 4:Configuration
Firewall Security and Policy (General Settings): Outbound direction of Packet Filter rules to
prevent unauthorized computers or applications accessing the Internet.
MAC Filter rules: To prevent unauthorized computers accessing the Internet.
URL Filter: To block PCs on your local network from unwanted websites.
You can find six items under the Firewall section: General Settings, Packet Filter, Intrusion
Detection, MAC Address Filter, URL Filter and Firewall Log.
General Settings
You can choose not to enable Firewall, to add all filter rules by yourself, or enable the
Firewall using preset filter rules and modify the port filter rules as required. The Packet
Filter is divided into two sections: Port Filters and Address Filters, used to filter packets
based-on Applications (Port) or IP addresses.
There are four options when you enable the Firewall, they are:
All blocked/User-defined: no pre-defined port or address filter rules by default,
meaning that all inbound (Internet to LAN) and outbound (LAN to Internet) packets
will be blocked. Users have to add their own filter rules for further access to the
Internet.
High/Medium/Low security level: the pre-defined port filter rules for High, Medium
and Low security are displayed in Port Filters of Packet Filter.
Select either High, Medium or Low security level to enable the Firewall. The only
difference between these three security levels is the preset port filter rules in the Packet
Filter. Firewall functionality is the same for all levels; it is only the list of preset port filters
that changes between each setting.
If you choose of the preset security levels and then add custom filters, you may
temporarily disable the firewall and recover your custom filter settings by re-selecting the
same security level.
The “Block WAN Request” is a stand-alone function and not relate to whether security
enable or disable. Mostly it is for preventing any scan tools from WAN site by hacker.
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