Alg Support; Figure 123: List Of User Defined Services - D-Link DWC-1000 User Manual

Wireless Controller

Figure 123: List of user defined services.

7.5

ALG support

Advanced > Firewall Settings > ALGs
Application Level Gateways (ALGs) are security component that enhance the firewall
and NAT support of this controller 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 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 controller's firewall.
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