Wifi router do not detect LAN cable with increased length

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Hitesh Dhola

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Dec 27, 2013
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I have WR720N TP link router. When I connect straight LAN cable of 1 meter from ISP modem to Routers WAN port, Wifi works perfectly.

When I increase length of the cable to 20 meters, router does not detect the cable. When I connect same cable to PC, internet work fine.
 
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RealBeast
The second router will work fine if you...
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Carobthomp

Carobthomp

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Nov 12, 2013
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It seems very unlikely that if it works going into the computer, that it wouldn't work going into the router. It might be worth just re-power cycling some of the equipment to test it one more time using the following steps:

Power off your computer completely, and leave it off.

Remove the power from your modem and your router.

Re-seat all the ethernet connections, and ensure the longer cable is properly connected to WAN port.

Plug your modem back in, wait for it to come online completely (online light solid).

Plug your router in and give it 1 minute to warm up.

Now power on your computer and see if you can get a WiFi or hardwired connection.

If this doesn't work, then there might be something else going on, though the issue seems very weird. If it doesn't work at all, maybe try looking into a powerline device for your home (assuming the purpose for the large cable is to relocate your router for better WiFi, or for a hardwired connection)
 
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Hitesh Dhola

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Dec 27, 2013
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Wow, Thanks for quick reply. Power cycle do not work. I simplified the question so that, I could explain it easily. I now think I shouldn't have done that. Let me explain it fully.

I have two wifi Routers. D-Link DIR-600L and TP Link WR720N. I connect D-Link to Modem. TP link is connected to D link with LAN cable. When I use SHorter length cable everything works fine. SO, no configuration issue, I think.

When I use longer length cable TP link do not detect the cable. If I connect that long cable to my PC directly it works fine with 2 mbps internet.

What I could conclude from long internet searching, is that ;

It might not detect because of Half or Full duplex configuration of LAN ports in different routers.

Connection:
Modem LAN >>> D Link WAN >>> D link LAN 1 >>> TP Link WAN >>> wireless
(WAN configuration may not be ideal, but in my defence, it works with short length)
 
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Carobthomp

Carobthomp

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Nov 12, 2013
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Ah, that might be the itself. Connecting 2 routers isn't the best way to go, unless you know how to correctly set it up, which I am not 100% with how to do that, but I know it can be quite complicated. As well, if you have 2 routers, you increase the possibility of wireless interference in your home.

You should see if you can get everything going with one router, then maybe look into alternative options such as extenders, powerline devices, or stronger routers (802.11ac)
 
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Hitesh Dhola

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Dec 27, 2013
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With one D-Link it is working perfectly since a month. I have recently bought second router for widen range of wifi. It also works perfectly with 1 meter cable. So, I don't think it is anything related to set up.:??:
 
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Carobthomp

Carobthomp

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You're right, it may not be, but I know for a fact that 2 routers will cause future issues. For the sole purpose of extending WiFi range, 2 routers is not ideal, I would at the very least look at some articles for the best setup, as it will only help with your WiFi, tomshardware has a good one, though I can't find it at the moment.

As for the other issue, I'm not quite sure why that would have the issue, but I think you are heading in the right direction. I wonder if it's possible that if the length is so long, it might be enough for the signal to degrade so directly to PC, it works fine, but by the time the router looks to re-broadcast the signal it doesn't have anything?

Either way, I think this one is beyond me, but I wish you the best of luck!
 
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RealBeast

RealBeast

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Sep 13, 2010
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The second router will work fine if you configure it as an access point -- turn off DHCP, give it a static address that is in the network range but outside the main router DHCP assignable range, and connect LAN to LAN -- do not connect to the AP WAN port unless you want a subnet, which you don't.

And a 20 meter cable is not the issue, since you proved that it works -- both Fast Ethernet and gigabit allow up to a 100 meter cable for that type of connection.

Remember to also enter that static IP address in the main router static device table (you should need the AP MAC address to do that).

Use a different wireless channel on the AP (selecting from the three non-overlapping channels 1, 6, and 11), but the same SSID, security type, and passphrase unless you want a different wireless name (SSID) so that you can control where you connect.

 
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Solution
RealBeast

RealBeast

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Connecting to the WAN port puts the "second router" on a different subnet, a patch (straight through) cable and LAN to LAN connection is the standard way to attach an access point, but glad that it worked out for you.

 
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