Use ADSL modem as router only, with ethernet input

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harish_r

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Dec 4, 2014
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Now here is the situation, I got a Fibernet internet connection. The modem is available outside the house and I only get an ethernet cable as an input
I have a D-Link DSL 2750U modem + router. It has only ADSL input and four ethernet outputs to use as a wired router.
But now my input has been an ethernet cable already coming in from an external modem, I want to use my modem + router device as a router only

There is one solution, disable DHCP server in the modem settings, connect the ethernet cable to one of the ethernet slots, and take output from the remaining 3 slots.

But I dont know how to do it. Any help will be appreciated
Please help !
 
Solution
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The default gateway on the access point (the second router) HAS to be set to the IP of your primary router.
The primary router will have a different default gateway because its gateway is a router owned by your ISP.

and just to be clear the DHCP server is supposed to be dissabled on the access point, but enabled on the primary router.
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OriginalCadaver

OriginalCadaver

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May 24, 2014
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From command prompt run ipconfig /all and your default gateway should be the IP address of your modem. It will likely be something like 192.168.0.1 or maybe 10.0.0.1 or something close to one of those numbers. One you have the default gateway open a browser and type the IP address in the and you should be prompted for a user name and password. Hopefully it is the default username and password, something like admin and password, but it may be different. You would have to talk to your ISP for that. Once logged in, you should find the option for disable DHCP.

An easier solution would to buy a new router that has an ethernet in, you can find them anywhere for pretty cheap.
 
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Someone Somewhere

Someone Somewhere

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Sep 23, 2012
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What you're describing also disables all routing and NAT, and makes it just a switch and Wireless Access Point.

That will only work if the ONT (which converts the fiber into ethernet) includes a DNS server and NAT itself. Usually they don't, and your router needs to do the NAT.

You'll probably need a new router.
 
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boosted1g

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Jun 12, 2013
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You need the IP address, subnet, and DHCP Server range of your ISP modem router:
With computer plugged into the ISP modem/router - run ipconfig as mentioned in previous post to obtain IP address of ISP modem.
Now type that IP into a browser and you will be able to enter the config page of your ISP modem router. Then browse around and find your subnet mask and your DHCP range; subnet mask is almost always 255.255.255.0 and DHCP server range will be the first 3 numbers of your router IP and then the last set will be a number range.

Now you can disconnect from that modem/router and connect it to the other one you are wanting to configure as a access point.
Run ipconfig to find its IP address, and input that IP into browser to get to its configuration page.
Now you need to set the IP address to an IP that has the same first 3 sets of numbers of the first router but is NOT in the dhcp server range (so if router IP is 192.168.10.1 and DHCP server is 192.168.10.50-192.168.10.200 then you can use 192.168.10.2). Set the subnet to the subnet of the first router, and set the gateway and dns address to the IP of the first router.
You may have to save these settings before continuing.
Now go to the DHCP server settings and turn it off.
Save and reboot access point

Now you should be able to plug the Ethernet from the primary modem into the access point LAN port and then be able to plug an Ethernet from the access point to a PC and have internet.
After you have confirmed you have internet via Ethernet from the access point then you can type in the IP you assigned the access point into your browser and then configure the wifi settings.

If you struggle to hard with this or if the adsl modem does not have the settings needed to make it into an access point then you will just have to spend the $25-50 for a normal router.
 
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harish_r

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Dec 4, 2014
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I have already tried something like that, now the problem is I get internet in all devices, not simultaneously but only one at at time. If I connect one device supposing there are 2 devices connected to the router, the other one gets disconnected and vice versa.
I did disable DHCP service it the router

I did something earlier and got it working on all devices at the same time. But now something happened, and it doesn't. Any solutions?

Also the Default Gateway is not usual. Some different number



 
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boosted1g

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Jun 12, 2013
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The default gateway on the access point (the second router) HAS to be set to the IP of your primary router.
The primary router will have a different default gateway because its gateway is a router owned by your ISP.

and just to be clear the DHCP server is supposed to be dissabled on the access point, but enabled on the primary router.
 
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