Alg Support; Figure 111: List Of User Defined Services - D-Link DWC-1000 User Manual

Wireless Controller
Figure 111 : Lis t of us e r de fine d s e rvice s .

7.5 ALG support

Advanced > Firewall Settings > ALGs
A p p licat io n Lev el Gat eway s (A LGs ) are s ecu rit y co mp o nent t hat en h ance t h e firewall
an d NA T s u p p ort o f t h is co ntro ller t o s eamles sly s u ppo rt ap plicat ion lay er p ro t o co ls .
In s o me cas es en ab lin g t h e A LG will allo w t h e firewall t o u s e d y n amic ep h emeral
TCP/ UDP p o rt s t o co mmu n icat e wit h t h e kn o wn p ort s a p art icu lar clien t ap p licat i o n
(s u ch as H.323 o r RTSP) req u ires , wit h o ut wh ich t he ad min wo u ld h av e t o o p en larg e
n u mb er o f p o rt s t o accomp lis h t h e s ame s u p p o rt . Becau s e t h e A LG u n d ers t an d s t h e
p ro t o co l u s ed b y t h e s p ecific ap p licat io n t h at it s u p p o rt s , it is a v ery s ecu re an d
efficien t way o f in t ro d u cin g s upp o rt fo r clien t ap p licat io n s t h ro u g h t h e co n t ro ller‟s
firewall.
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