connection ADSL modem with TP-Link router

Posted on 2007-11-14
Last Modified: 2013-12-19
I have 2 PC's with static IP adresses connected to tp link router TL-R402M. Router address is, and PC's have and This all worked well.

Now I have and ADSL connection, and would like both PCs to have internet connection. For the sake of clearance I will call ADSL modem/router just a modem, altough it has routing capabilities. Modem has ip address also. To test the connection, I have done the following:

I connected only one PC to modem, turned DHCP off on modem and set LAN range to accept my PC static IP - and internet works ok.

Now, since modem and router have same IP, I have changed router IP to and now two PC's can connect to router again, but cant ping modem. What do I need to set on these two devices (modem and router), so they can work together. What settings should be made for best results? I suspect one should be set in pure bridge mode, but dont know how, and dont know if it is the right/best way. Should some settings be done on router WAN settings - now it is set to receive dynamic IP address?

I have connected modem to WAN port of the rotuer, just to mention.

Thanks, Goran
Question by:Priest04
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LVL 28

Expert Comment

by:Michael Pfister
ID: 20279191
Option 1: just discard the TP-Link router and only use the router that includes the DSL modem
Option 2: get a plain DSL modem and attach it to the WAN port of the TP-Link router
Option 3: may or may not work, depending what you can configure on the routers: configure modem/router to use a completely different class-c network, like, then configure modem/router to be a DHCP server, configure ISP access data to modem/router, then configure TP-Link router to use DHCP on the WAN port and NOT dial in to the ISP (LAN?).
LVL 18

Author Comment

ID: 20279316
option1: not possible, since ADSL modem doesnt have LAN ports on it
option2:  not possible, I cannot use any other ADSL modem, because my ISP didnt give me username and possword for PPPoE connection (they are also not seen on ADSL modems settings), I am only allowed to use theirs.
option3: I am not quite here with you, but this what I know for sure:

configure modem/router to use - I can do this on both modem and router
configure modem/router to be a DHCP server -  I can do this, but I was more like for DHCP OFF option
configure ISP access data to modem/router - modem has dynamic ip address, and it gets if from ISP, so i dont need to type any ISP settings - and I didnt receive any.
configure TP-Link router to use DHCP on the WAN port and NOT dial in to the ISP (LAN?) - this I dont get...  WAN settings for tp-link router are set to dynamic, but it doesnt get any settings at all when trying to get them - this is at my opinion where the problem lies,

Is there any option to set my tp link router behave like switch, since it will work then witout any problems.

LVL 28

Expert Comment

by:Michael Pfister
ID: 20279861
I don't understand "DSL modem doesnt have LAN ports on it". There must be at least one. Get a cheap 100 MBit 4-port switch and connect the modem/router from your ISP and your clients together. You may need to get a crossover- ethernet cable to connect the modem/router to the switch.

If you want to use your TP Link router as a switch, do not connect the ISPs modem/router to the WAN but to one of the LAN ports. You probably will need a crossover ethernet cable to get a connection.

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LVL 18

Author Comment

ID: 20284072
There is one lan port on it, and this is the one I used to connect tp link to. I have managed to connect both pcs to adls modem without router, one pc with ethernet cable, and another pc to usb cable, and it is working so far.

Just one question, so I can be sure for future challenges, when I connect 2 routers, I need crossover cable between them, not straighthrough?

LVL 28

Accepted Solution

Michael Pfister earned 500 total points
ID: 20287880
Yes, if you want to connect 2 routers or 2 switches directly you usually need a cross-over cable.
Some models have a small button to switch between "normal" and "cross-over" for one of the ports.
The newer switch models with gigabit ports are able to autodetect the required setting, so the cross-over cable is no longer required.

LVL 18

Author Comment

ID: 20290505
Thanks. I was kind of living in a believe that all routers have autosense ports, but its seems that they dont.

Thanks for the help,

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