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Internet dies when connecting eithernet cable

November 28, 2012 at 07:20:59
Specs: Windows 7

Hi
I've got a Cisco DPC3825 modem that I also use as a wifi router. Conntected to it I have 4 eithernet cables:

1. From PC to Router
2. From another PC to router
3. From TV to router
5. From a Dlink Powerline Adapter to Router.

It took me a while to figure this out but when I unplug all the eithernet cables and plug back in #1 and #2 (from above) the internet works. When I plug back in #3 and #4, the internet dies. Meaning, I am connected to the network but not the internet.

Is there an obvious issue here? I've reset the modem, changed SSID and restarted the PC many times but still can't figure out this issue.


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#1
November 28, 2012 at 07:56:42

Ok, with only 1 and 2 plugged in, plug only 3 in. What happens?

With only 1 and 2 plugged in, plug only 4 in. What happens?

If one of the two causes your internet to stop working, you'll know which one is your problem.

If the internet still works, redo the above only this time plug 4 in after 3. This should cause a loss of internet. If it does, unplug 3 and 4 (get internet working again) and then reverse the order and see what happens.

If you consistently lose the internet when plugging 3 and 4 in at the same time, but don't singly I would then unplug 1 and 2 and see what happens with just 3 and 4.

I suspect this is a conflict between devices or one bad device affecting all others which is why I wanted you to do the above to help figure out what is the problem device(s).

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#2
November 28, 2012 at 08:51:20

The issue is with #3... The TV to router. I've plugged #4 (powerline adapter) and that works.

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#3
November 28, 2012 at 09:17:29

Well, for the duration you're going to want to leave the TV unplugged.

You could try a different cable to see if it's a cabling issue, but I don't think that will be it.

Once you rule the cable out, I would call the support line for your TV and talk to them about this as they'll be the only ones who'll be able to help you.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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Related Solutions

#4
November 28, 2012 at 15:36:57

Why would 1 cable mess up all the others? Why wouldn't that single cable not work? How does the one cable affect the others?

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#5
November 28, 2012 at 16:21:28

A cross wired cable can cause a short just as a fault on the tv hookup can cause a short thereby shorting out the system

Odd are its not the cable but the TV. You can easily test this by swapping cables.

If you connect only the TV does it get internet?

Or does it have a static ip assigned and would that ip be the same as the gateway ip of the router? That would take out the entire lan thru a ip conflict. Won't be the first time I saw someone misenter the ip info.

Answers are only as good as the information you provide.
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