Asus RX3042H - Manual (Page 18)

Getting to Know RX3042H RX3042H User's Manual
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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 RX3042H, packets pertaining to an application, require a
corresponding allow rule. In the absence of such rules, the packets
will be dropped by the RX3042H 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 RX3042H 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 RX3042H 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.