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Networking & Wireless


modem router connection problem, help plz

by _asgar_ / February 16, 2013 2:19 PM PST

hey all,

i have got an MTNL modem installed and i am trying to connect a D-link modem and use the same as a router.
I disabled the DHCP on D-link modem and configured it properly and hooked it using a 1metre patch cable with the base modem and everything worked fine. But when i am connecting the modems using a 25metre cable i fail to get the connection. When i insert the 25m cable directly into the lan port of pc i can browse without any issues. Please guide.

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All Answers

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So you are using the router as a WAP?
by R. Proffitt Forum moderator / February 17, 2013 6:24 AM PST

And this cable is going to the LAN port of the router?

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by _asgar_ / February 17, 2013 6:23 PM PST

Lemme explain the scenario a bit:

I have one ISP provided dsl modem which is working fine both in wired and wireless mode.
Now i purchased a D-Link wifi modem to extend my range, so i am connecting the D-Link modem with The base modem. I am setting base modem at and its DHCP enabled from to
i set the lan address of D-Link modem to and disabled its DHCP.
Now when I connect the modems using a small straight patch cable the D-Link modem is able to ping the base modem and everything works like charm, but when I am trying to connect the modems using a 25m straight cable, the D-Link modem is unable to ping the base modem. This had made me suspect that there is smthng wrong with the cable but when i insert the cable directly into the LAN port of PC i am able to ping the base modem, so in nutshell the communication problem arises when i am using 25m cable and the problem doesnt occur when a small length cable is used, this is a strange and weird problem.

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Re: router
by Kees_B Forum moderator / February 17, 2013 6:42 PM PST
In reply to: hi

I note you didn't answer Bob's simple question. Let me repeat it, in case you're a slow reader: "And this cable is going to the LAN port of the router?"


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by _asgar_ / February 17, 2013 6:52 PM PST
In reply to: Re: router

sorry for being a noob. Both the modems have 4 identical ports, and i tried connecting both the modems trying all port combinations. The router is a D-link wifi modem which i am trying to use as a router by disabling its DHCP.

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So it's strictly a cable problem?
by Kees_B Forum moderator / February 17, 2013 7:00 PM PST
In reply to: hi

A 1m cable works both directly (base modem to PC / base modem to D-Link with 1 m cable, D-Link wireless to PC)?
And a 25 m cable works directly (base modem to PC), but not when doing base modem to D-Link with 25 m cable, D-Link wireless to PC)?

Then I'd try a few other cables in different lengths for a better diagnosis.


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by _asgar_ / February 17, 2013 7:05 PM PST

Exactly that is what is going on. I tested the cable using a cable tester and it shows cable is fine, last month while changing the connector of the cable i had swapped a pair and the modem was up but the speed was low, dunno what is it that is causing the problem. can crossing over the cable solve the problem?

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Never got a clear answer.
by R. Proffitt Forum moderator / February 18, 2013 12:00 AM PST

Google this.

"How to use a router as a WAP."

Since we can't get a clear picture or settings I'll share that's how I use a second router. The second router's WAN port is never used.

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hey bob
by _asgar_ / February 18, 2013 1:00 PM PST

i googled as u suggested and came to know that this is the exact process i have already followed. I am using the 2nd modem as a WAP. with small cable everything works fine but no luck with long cable.

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Long cable
by R. Proffitt Forum moderator / February 18, 2013 1:35 PM PST
In reply to: hey bob

Should be good up to 100 meters. If it fails, it's a safe bet the cable is the issue.

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