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Question

Wifi doesn't work when LAN is connected and turned on

Jul 3, 2015 6:53AM PDT

Hello all, I have a weird issue and would like your help.

My ISP gives a Huawei modem that works with optic fiber. From the modem I have a LAN cable going inside the walls all the way to the main room, in which I have my cable TV box connected. Recently I have the need to have wifi signal in my room as the Huawei is not strong enough to reach it.

So, I took a Linksys WRT54G that I had, factory reset it, and in the setup I unchecked the automatic DHCP. First I connected the cable that comes from the Huawei into the "main" port of the Linksys, and a LAN cable from the "exit 1" to my cable TV, but then my cable TV had the message "without TV signal in your STB". So a friend told me to plug the cable coming from the wall into "exit 1", and hook the LAN to the cable TV in "exit 2" (sort of working as a switch).

With that setup, the cable TV works properly, HOWEVER when I connect to the wifi, the device connects but the internet DOESN'T work. If I turn OFF my cable TV, the wifi internet works properly. I started a "speed test" with the cable TV off, it was going fine and halfway I turned the cable TV on... pum, lost connection.

So basically my issue is that I cannot have the two devices working at the same time. Could it be an IP issue? Please give me a help guys.

If you need more info please let me know.

Thanks in advance.

Discussion is locked

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Answer
Nothing's broke here.
Jul 3, 2015 8:22AM PDT

It's not an IP issue but one you need to redesign. I can't hold a complete class in networking here but what you see was expected.

Now if you had wanted to extend your network's WiFi you would not have used " the "main" port of the Linksys," Instead it would have gone to one of the LAN ports and the router configured as a WAP.

Google this for more. "How to use a router as a WAP"

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Answer
This sound a bit strange setup for cable TV.
Jul 3, 2015 8:45PM PDT

Why would cable tv going through a modem? What company is this?