User`s manual

VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
60
General Settings
You can choose not to enable Firewall and still be able to access the URL Filter and IM/P2P Blocking, or
you may choose to enable the Firewall using preset filter rules and modify the port filter rules as required.
The Packet Filter is used to filter packets based-on Applications (Port) or IP addresses.
There are four options when you enable the Firewall as follows:


 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 predefined 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. For more
detailed on level of preset port filter information, refer to Table 1: Predefined Port Filter.
If you choose of the preset security levels and add custom filters, this level of filter rules will be saved and
you do not need to re-configure the rules again if you disable or switch to another firewall level.
The “
Block WAN Request
” is a stand-alone function and not related to whether the firewall is enabled or
disabled. It is intended to prevent port scan tools probing the router from the WAN.
Caution:
A
remote user who is attempting to perform firewall setting
actions may result in blocking all access to configure and manage the
device from the Internet.