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internet stealing?

Hewlett-packard / P9851a-aba 523n
June 17, 2010 at 13:12:06
Specs: Microsoft Windows XP Professional, 1.798 GHz / 495 MB
I currently have a uverse bundle from AT&T. I was setting up a firewall hole when i noticed that there were six IP addresses listed as connected to the router. I only have three computers connected to the internet in the house. the extra three computers are reported as connected to the HomePNA. I think this means they are plugged into the ethernet port on the back of the router or otherwise connected to my coaxial line. Does anyone know if these extra three addresses are normal? I had a theory about them representing the cable boxes. I have four and one is not plugged in. FYI, I know enough about computer networks that I do not need things explained step by step.

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June 17, 2010 at 13:39:50
Your post is unclear as to the amount of pcs in your home as well as what is connected to what.

Is the coax network have pcs on it and is it connected to the router?
Do you have three or six computers?
Are your cable boxes connected via coax?

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June 17, 2010 at 13:54:32
You have three computer and four cable boxes, one not connected. That totals six devices. Seems reasonable to me that six IP addresses are showing up.

Any device connected to an TCP/IP network will have its own IP address otherwise it wouldn't work.


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June 17, 2010 at 13:59:39
I have three computers in my home connected to the router as said in my original post. One is connected to a cable box which is connected to the router by the cable/coax line. This appears as connected by HomePNA on the router configuration screen. The second is connected wirelessly. The third is connected by ethernet cable directly to the router. The three extra computers that I do not own or know the location of are connected by HomePNA apparently. My router shows six computers connected to it. Yes my cable boxes are connected via coax. I think that either someone is stealing my internet or the cable boxes show up as computers.

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June 17, 2010 at 14:32:10
"One is connected to a cable box which is connected to the router by the cable/coax line"

Nope doesn't work like that.

Since the coax devices are not connected to the lan side of the router they will not and I repeat not show up in the routers attached device table.

That would be like saying your neighbors mail is delivered to your house because you are all on the same street.

Make sure your wireless on the router is secured. Doesn't sound like it is.

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June 17, 2010 at 15:21:12
If digital cable is bidirectional, it only makes sense that the modem can communicate with the cable boxes. I have already tested this. If I disconnect the power to the modem I cannot get internet from any of the cable boxes. Also I looked at how the houses cable is wired and found that the modem is connected to a diplexer. Anything 25 Khz to 8.5 Mhz goes from the modem to the cable company. Anything 12 Mhz to 900 Mhz goes to all of the cable boxes. Also there is an option in the router that asks whether the user wants the HomePNA to go to the coax. connector or the RJ-11 jack labeled HomePNA on the back of the router. I think that all of this pretty much proves that internet can be sent to the cable boxes through the coax. as a modulated signal from the modem. I guess all I really wanted was a second opinion on the cable boxes appearing as computers on the router.

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June 17, 2010 at 15:32:53
I plugged in the unused cable box and another device appeared connected to the router. I also found a mac address on the bottom of the cable boxes. I guess the cable boxes do appear as computers to the router.

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June 17, 2010 at 15:56:31
according to this all TV and Internet goes thru the same device

According to that link the "coax" is the video distribution [VSDL] which does connect to the residencial gateway.

So yes you are seeing this correctly. All of these devices are on the lan side of the gateway.

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