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Solved Roku is showing up in my arp cache

November 1, 2015 at 01:59:32
Specs: Roku
I noticed My Roku is showing up in my arp cache on my windows 7 PC. I don't have sharing turned on in my PC settings, it's set to public. Why would my Roku or PC be trying to talk to each other?

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November 1, 2015 at 02:25:51
The PC is searching for media devices.

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November 1, 2015 at 12:45:19
I'm not sure what you mean. I looked at my settings again, it is set to public. And discovery, file and printer sharing are turned off, streaming is turned off in media player. What am I missing?

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November 1, 2015 at 13:26:27
✔ Best Answer
Have a look at your Services and see if "SSDP Discovery" is running. This service discovers devices such as UPnP devices, which include media streamers. Your Roku is a media streamer which your PC has discovered; hence the ARP entry.

It's nothing to do with you configuring your computer as a streaming device.

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November 1, 2015 at 13:53:10
It is running, but set to manual. I guess I'm not sure what manual means then. I looked in task manager and selected go to process. It changes to the process tab, but nothing is highlighted there right now. I don't see my Roku in my arp cache right now either. So, its sounding like this isn't something to worry about then? But how can I tell what calls on this service? I can see a PID associated with it, although I'm not sure how that helps.

Edit: Well, I looked up manual vs automatic. Sounds like automatic is started with the OS at boot, where as manual means it must be called on by some other service or program. I looked in msconfig and SSDP is in there. I thought that meant it was started on boot, but that must not be the case if it is set to manual in services.msc. The entries in msconfig must be an additional layer of startup? In which case, I'm not sure which setting takes priority or what that means.

message edited by ISAmad

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November 2, 2015 at 02:30:08
Is there a reason that you are worried about the ARP entry?

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November 2, 2015 at 12:12:02
I find it troubling having an unprotected device that is always on and connected to my network. And then to find that it's been communicating with my PC, when it should have absolutely no reason to worries me further.

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November 2, 2015 at 12:39:56
A media streamer like this is, by definition, a networked device. I'm sure you could set it up so that it didn't connect to your network but then what would be the point of it?

I think it would be more accurate to say that your computer has been communicating with it rather than the other way round. Periodically your computer broadcasts the question "Are there any media devices out there?" The Roku responds and this causes the computer to enter it's details in the ARP table.

Unplug the Roku from your TV, put it back in its box, and all will be well.

message edited by ijack

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November 2, 2015 at 19:08:43
Well, I wont be doing that, but I can probably isolate it behind a firewall or put it on a different subnet. Any suggestions on getting that done?

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