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iPBX30 User Manual
Chapter 2
2.3.2.4 Application Level Gateway (ALG)
Applications such as FTP open connections dynamically based
on the respective application parameter. To go through the firewall
on the iPBX30, packets pertaining to an application, require a
corresponding allow rule. In the absence of such rules, the packets
will be dropped by the iPBX30 Firewall. As it is not feasible to
create policies for numerous applications dynamically (at the same
time without compromising security), intelligence in the form of
Application Level Gateways (ALG), is built to parse packets for
applications and open dynamic associations. The iPBX30 NAT
provides a number of ALGs for popular applications such as FTP,
and Netmeeting.
2.3.2.5 Log
Events in the network, that could be attempts to affect its security,
are recorded in the iPBX30 system log file.
The log maintains a minimum log details such as, time of packet
arrival, description of action taken by Firewall and reason for action.
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