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Old 04-03-2007, 10:40 AM   #1
depam
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What is UPnP? Is it worth trying?


Hi!

I know this is not the correct forum to post this inquiry. But knowing that you guys knows more about almost anything, I just thought on giving it a try. I'm really kinda confused about UPnP. Is this a new technology? A friend of mine explained to me that it opens port without user intervention. How true is this? Does it also provide a NAT traversal?

The reason I asked this is that I found a product called Sling Media. I am reviewing if it can be ported on my home network and still be able to watch TV remotely (away from home). Now on the manual which I downloaded from the site, it tells something about enabling UPnP. I'm kinda curious how this thing will work since the ISP that I am using provides me a Private IP instead of the Public IP. Am I right when I say that for it to access my home private network, I should have a public IP? Or does the UPnP automatically opens the port for me without me knowing and provide a NAT traversal? Do you have any idea whether the Sling Media Tuner hardware automatically connects to a central server for my remote PC to be able to reach it? I'm kinda confused here since I've been hearing about security issues on UPnP...Please help. Thanks.
 
Old 04-03-2007, 10:48 AM   #2
jschiwal
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UPnP stands for universal plug-n-play. It allows a program running inside your LAN to open and forward ports on your NAT router. It is a very bad idea to enable it. It would be better to forward the ports that you need in your routers config instead of enabling UPnP in the router.

Since you are given a private IP address, you will not be able to initiate a connection to your computer from the internet. I would suggest a different ISP. In effect, you are behind your ISP's own NAT router, and there are probably more hosts than IP addresses, so it isn't possible to have a port directed to a particular IP address.

Last edited by jschiwal; 04-03-2007 at 11:08 AM.
 
Old 04-03-2007, 06:15 PM   #3
depam
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Ok Thanks. I thought the UPnP has something to do with the sling media connecting to a central server to achieve NAT traversal. But anyway, do you know any other alternatives on making Sling Media work other than changing my ISP. My last option is to change the firmware of the Linksys WRT54G to a OpenWRT which will enable me to run OpenVPN and configure site-to-site VPN just for me to reach the slingbox.
 
Old 04-06-2007, 12:55 PM   #4
jschiwal
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Find out which ports the sling box uses and forward those ports to the sling box.
In other words, do manually what the sling box would do automatically. Before disabling it, look in the configuration dealing with port forwarding. It may have been set for you already. What you don't want is for something besides the sling box to open a port behind your back.
 
Old 04-07-2007, 04:57 AM   #5
depam
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Ok thanks I'll do it. May other questions is that how will I know if my router has UPnP installed by default. My other firewall is IPCop. Is it also possible that UPnP is enabled by default on my IPCop firewall? How can I get rid of it and disable it for good? Thanks.
 
Old 04-12-2007, 01:53 AM   #6
jschiwal
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If you disable UPnP in the router then the problem is solved. It is a technology for devices rather than for a firewall. You really need to look at the configuration for your devices to see if it is present and enabled. I doubt if IPcop would offer it but check your configuration to make sure.

This link contains information on configuring a Linksys router for Slingbox.
http://kb.slingmedia.com/al/6625/942...081BQUdOxkcVn2
 
Old 04-12-2007, 07:29 AM   #7
depam
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Thanks. IPCop is really a solid firewall and I also doubt that it offers UPnP. Most gurus believe that UPnP is a really a security issue and should not be used. Regarding Slingbox, I already gave up because my ISP doesn't offer a public IP. The gateway that I am using is already a private IP.
 
  


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