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I have a Dishtv receiver with sling adapter. The receiver is connected to my router. The router is a netgear DD-WRT flashed router.

I was told be a dishtv rep that the router use port 80, 443 and 5678 and recommended that I keep UPnP enabled. I wasn't told it was udp or tcp.

I haven't set UPnP to enabled on my router yet, when I login into dish portal, I can see that my receiver is active (green status).

When I use one of those online portscanner and scan to see if my router to listening on these ports, I get a negative response.

How does dishanywhere know that my receiver is active? Is the receiver sending data packets to dishanywhere server saying that it is alive?

I can control my DVR from dishanywhere i.e. change channels, set recordings, reboot the receiver. Does this means that the site is sending packets to the DVR on some port?

If yes, How do I find out the port number?

I want to know if there would be any network security issues?

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UPnP is used to dynamically map exterior ports to interior ports on the go. This is used for NAT from your internal network to the exterior one. It is not really a security risk in itself since the port mappings are only really created when the device from the local network initiates the connection.

It is most important when you have multiple devices attempting to access the same resources on the same port. UPnP handles this type of situation.

What dishtv is recommending is that to ensure you don't have any connectivity issues that might arise from your current set up. Your router is smart enough to open up ports for your receiver when it connects out.

If you're really curious about which ports traffic is travelling on then you can hook up some intermediary device between your receiver and dish to monitor the traffic. You can do this with a hub and a PC running Wireshark. That will show you all the back and forth packets.

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Q1): Yes, Q2): UDP port 1900 Q3): Yes. Buy yourself a second NAT router and place your sling adapter on a DMZ.

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hmm.. UPnP is disabled on my router.. yet the receiver to dishanywhere works. – bcd May 22 '13 at 22:06

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