NAT traversal is not new to me, it is a must feature for many smart Router/NAT and gateway device, especially for use of voice/video and VPN. However, I have not fully understood the benefit and solution it bring to the ever-complex technology world. NAT traversal or NAT-T help peer-to-peer application to traverse a NAT gateway and thus it has been disable generally in enterprise world, while it is widely used by home route/NAT gateway.
I read an article today to learn more about UPnP, and I found that some of functions it provide overlap with NAT traversal. Take a look at this :
"NAT traversal allows network devices or peer-to-peer applications to traverse a NAT gateway by dynamically opening and closings ports for communication with outside services."
That is what UPnP is doing , you can find out this when you look up your home router's UPnP port forwarding list . I admit that I am confused by that, but I will later on to explore the topic of this with the example of following applications:
Windows XP remote assistant - will this feature really work when a private IP XP machine send out help request to remote friend
VoIP ATA - How VoIP ATA open the port 5060 to the outside world without a network admin configure in router? Can you get VoIP ATA or X-lite work in a enterprise firewall? If yes, what is necessary?
Now it is come to Skype - what is the screte of Skype because it works everywhere?
Enable and Disable SSDP service on XP and see what happening
MSN live message - what server port this application open on the NAT device?
Security discussion - When it open the port without your knowledge can be a good thing for the sake of convenience , but can become a vulunrability for hacker to exploit , any report incidents about this?
here is the link that I recommend:
http://www.microsoft.com/windowsxp/using/setup/expert/crawford_02july22.mspx
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