Reply to post: Re: What's this? I know, I'll plug it in...

We did NAT see that coming: How malicious JavaScript can open holes in your firewall for miscreants to slip through

FordPrefect

Re: What's this? I know, I'll plug it in...

No ALG is a service that runs on various firewalls and proxies that allows devices sitting behind a hide NAT to work with the SIP protocol which requires an inbound connection for VOIP calls. It sits and brokers the connection by listening into the packet stream on the initiation of a SIP session and dynamically opens up inbound service ports as required similar to uPNP. You don't need it for skype, or a lot of the consumer application based voice services. In many cases assuming your router isnt horribly hobbled you can probably turn it off, although some people might have corporate VOIP systems and some people even have home VOIP systems. I know when I've seen it in corporate environments before normally the actual server is behind a corporate firewall and requires users to VPN in, meaning the ALG would probably not be needed.

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