48D-Link DSL-G2452DG User Manual
Section 4 - Configuration
ALG
ALG Conguration
Select Enable next to each ALG type to enable them.
Click Save when you are done.
Application Level Gateways (ALGs) are security components that enhance the firewall
and NAT support of this router to seamlessly support application layer protocols. In some
cases enabling the ALG will allow the firewall to use dynamic ephemeral TCP/ UDP ports
to communicate with the known ports a particular client application (such as H.323 or
RTSP) requires, without which the admin would have to a open large number of ports to
accomplish the same support. Because the ALG understands the protocol used by the specific
application that it supports, it is a very secure and efficient way of introducing support for
client applications through the router’s firewall.
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