106D-Link DSL-124 Wireless N300 ADSL2+ Modem Router User Manual
Section 4 - Conguration
NAT ALG
ALG CONFIGURATION
Check or un-check the boxes next to the protocols to enable or disable them.
Click Apply Changes 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 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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