Communication Between Router & Modem

As described in a previous post to this forum, I have a Toshiba Tecra S2 notebook that connects to the internet via a D-Link DI-524UP wireless router and an Asus AAM 6000EV DSL modem. After two or three satisfactory years, I’ve been having trouble with the wifi and am trying to see if it is a problem with the router. When I connect to the router via Ethernet cable, all is well, but on wifi, the connection often dies and stays dead. I now have an Asus WL-520GU router to try. Both wireless and cable links to the router connect without trouble, as indicated by the icons on the bottom right of the screen, and the fact that I can communicate with the router and use its setup screen, wizards etc, but the router will not communicate with the modem. The WAN LED on the router shows it is seeing a connection, and the PC LED on the modem shows it thinks all is well, but when I try to connect to the internet, nothing happens. When I go back to the D-Link router, all is well again. If I bypass the router altogether and plug the DSL modem directly into the Ethernet port of the Toshiba, I get indication that the LAN is connected and working, the correct LED shows on the modem, but again I can do nothing with it. Before I started using the D-Link router some years ago, the Asus modem was connected directly to the Toshiba by Ethernet cable, and it worked fine.

Can anyone explain why the modem seems to want to talk only with the D-Link router and ignores the Toshiba notebook and the Asus router, even though it establishes a LAN connection to them? What can I do to get the Asus router to talk to the modem? I have looked through the CD manual for the Asus router and it implies that all I have to do is plug the modem into the appropriate Ethernet port on the router, which I have done. I am using the automatic IP address arrangement appropriate for my ISP and as used by the D-Link router. I can’t remember having this trouble when I first set up the D-Link router with the Asus modem, but perhaps old age has got to my memory.

I can’t help feeling I’m missing something very basic here, but I’m stuck. Any suggestions gratefully received.

Alistair

 

To start with LEDs on network ports can just mean that there is a electrical connection between two devices. It may well not have anything to do with the configuration of the device.

If you connect with the DLink router, does the modem have an internal address? (commonly an address starting 192.168)

What is the internal address of the Dlink router?

What is the internal address of the ASUS router?