DynDNS, D-Link, LinkSys
 

I have a D-Link ADSL Modem (500DT) which has a single serial port and which does not do DynDNS updating. Hanging off of it is a LinkSys WRT54G router which does do DynDNS updating.

The only way I can get these two to work together is by using the D-Link modem to do all the routing. The LinkSys is just acting as a switch.

I have tried setting up the D-Link in single-user mode. But, when I do this the LinkSys can not establish a PPPoE connection with the host. I've tried plugging the D-Link into the LinkSys' uplink port but that doesn't work either.

The LinkSys is really a much better router, but I can't get it to work with the D-Link as other than a simple switch.

Any ideas?

I'm assuming that the D-Link is a Modem/Router ( I can't find one called "500DT"). If this is the case, you should turn off Dynamic DNS in the D-Link. This should allow the Linksys router to obtain the actual IP address of the modem.

Sorry, the model number of the D-Link is 500T and it is a modem/router.

It does not support Dynamic DNS. At least I can't find any settings for it in the configuration panels.

Whoops! I meant Dynamic DHCP! DNS is supplied by your provider. These can be manually entered at any point in the network but shouldn't need to if you can turn off the DHCP server in the D-Link.

Again, I couldn't find reference to a D-Link DSL-500T, but I did find the DSL-500. According to it's (now obsolete) Quick Install guide, you can log into the router at address 192.168.0.1 when connected directly. The default name and password is "admin" for both. Then you should be able to access the "DHCP Configuration" to turn it off and allow the Lynksys to handle it.

I know how to configure the D-Link and the LinkSys. That's not the problem. The problem is that when the LinkSys is handling the DHCP duties it still cannot detect the external IP address. In the Dynamic DNS section it just says "Not connected to the Internet" or something like that.

I think that in order for this to work the LinkSys has to establish the PPPoE connection, but it is unable to do so; even when the D-Link is in single-user mode.

The D-Links router should handle all of the PPPoE connection even in single user mode. If it's not supplying the actual IP address rather than a router address (192.168.0.XXX), it would cause problem with the Linksys

So, how do I get the D-Link to supply the actual IP address to the LinkSys?

By finding the option to turn off it's DHCP Server feature.

OK. I did that. Now the LinkSys is handling DHCP and it's working fine. But, under DDNS (Dnamic DNS) I get this:

Internet IP Address: 0.0.0.0
Status: No Internet connection

But, the machines on the LAN are connected to the Internet just fine.

And, The SysStat Dashboard Widget is able to detect the external IP address.

Why can't the LinkSys detect the external IP?

DNS is your Domain Name Server and shouldn't be necessary if your provider is sending you DNS addresses. If you're able to access the web with conventional addresses, your DNS is working correctly.

If not, then contact your provider for the DNS server addresses and manually enter them into the Linksys.

I don't think you understand what I'm talking about here.

The LinkSys has a feature that allows it to update a dynamic DNS service like dyndns.org with your current IP address. This is for people like me who do not have a fixed IP address. So, whenever I need to tell someone my IP address or if I need to SSH into my home machine I just lookup the IP address of: korat.dyndns.tv, which always resolves to my current IP, whatever it happens to be.

Right now I'm using software called "DynDNS Updater" which fetches my IP address from an external service and the updates the dyndns.org DNS servers with the current IP address.

Unfortunately, "DynDNS Updater" has a bug, acknowledged by the author, which causes it to make an unnecessary log entry every minute, even though it only updates the servers once every 15 minutes.

So, I'd like to stop using this software and use the Dynamic DNS feature of my LinkSys router instead.

Unfortunately, I can't get it to work, no matter how I fiddle with the configuration of both the D-Link modem/router and the LinkSys router.

Any ideas out there?

Ah! I see now! I didn't realize my Linksys had that feature. Now, have you verified that your Linksys is getting your actual IP address in the Status menu? It would have to start with something other than 192.168.x.x.

No, as I've said many times above, the LinkSys cannot get the actual IP address.

What I've been trying to ask from the beginning is how to configure the D-Link modem/router and the LinkSys router so that the LinkSys can obtain the IP address assigned by my ISP....

This is the problem we've been trying to help with. The DDNS will not work until you can bypass the internal router of the D-Link. That may mean that you'd have to setup PPoE on the Linksys. The DDNS settings have to wait until everything else is working properly.

Is it possible that the modem is set to accept only a specific MAC address? If so, you may need to have the Linksys clone that MAC address.

The first step is to connect the computer directly to the D-Link and verify that you're getting a real IP address and preferably all three DNS addresses. Once that's working, connect the Linksys. The Linksys should be able to accept the IP address in the Status section.

Basic Networking Help
 

I have an ADSL modem (DLink DSL-500T) with a single ethernet port, and a router (LinkSys WRT54G).

I would like the LinkSys to do all the routing, NAT, DHCP, etc.

Can someone point me to instructions on how to set up the modem and the router to accomplish this?

I can get everything to work if the DLink does all the routing etc., but in this configuration the DDNS (Dynamic DNS) feature of the LinkSys does not work.

(I know, I asked this question before. Just thought I'd try again using different words....)

Put the linksys in the DMZ of the D-Link.
Unfortunately dDNS may never work on that setup. You may have to keep doing dDNS from the d-link.

Different words are fine.
Different threads are not. Please don't start a new thread when there is an existing one on the same (or similar) topic.
I have merged your two threads.

If you can't figure out how to get this to work (let the linksys do the pppoe), check whether your Linksys can be flashed with alternative firmware such as dd-wrt. WikiPedia has a good summary which models can and which can't be flashed.

Then you should be able to cook up a solution to figure out your IP and update dyndns correctly.

Tried that but the LinkSys still says "No Internet Connection"

The D-Link doesn't do dDNS.

When I lived on Saipan I had an ADSL modem supplied by Verizon and this same LinkSys router. At that time I just connected the ADSL modem to the LinkSys' WAN (upstream) port and everything worked fine.

But, with this D-Link router I can't get it to work if it's connected to the WAN port; I have to connect it to one of the LAN ports.

I can't help but think that I'm doing something wrong with the D-Link configuration, but I can't figure out what it is.

I should note that the D-Link had to be flashed with special firmware to get it to work with the flavor of PPPoE served up by the phone companies here in Thailand. I don't think there is anything similar for the LinkSys.

I'm a little wary bout flashing the LinkSys with "unofficial" firmware. If I mess it up, which is likely, I'll have to buy a new router....

Problem solved:

D-Link in bridged mode connected to LinkSys WAN port.

LinkSys handles PPPoE, DHCP, etc. Operating mode is Gateway.

i have a Dlink DSL-500T as my modem/router and a Linksys WRT54GC as my wireless router.

i need help on how to configure them both to work. need big time help!!

Here's the short, simple answer:

You should set up your 500T to be a stand-alone modem and use the WRT54GC to do all the routing, NAT, etc.

First configure the 500T. Either connect it directly to a computer or to one of the LAN ports on the LinkSys. Put it in bridged mode. You will have this choice in the WAN configuration section. Save the configuration and restart the 500T.

Then connect the 500T to the WAN (uplink) port on the LinkSys. At this point the 500T will be in modem-only mode and will not have an IP address so you will not be able to see it.

Now configure the LinkSys to do the ADSL management (PPPoE or whatever your ISP has). Also set up the LinkSys to do DHCP, NAT, wireless, etc. Make sure the LinkSys is in Gateway rather than Router mode. (On my LinkSys this option is in the "Advanced" routing section.)

You may have to go to the "Status" section of the LinkSys configuration pages and explicitly tell it to connect.

Once it connects you may need to have each computer on the LAN get a new DHCP lease. You can do this from the Mac's Network setup pane.

Post again if you have specific questions.