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dhcp in-op on wan

looseliam

looseliam

aww I wanted to explode
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Oy, I feel like such a n00b #-o

I'm trying to isolate a bottleneck on my network. I think it's my ancient router. So, all I have to do is connect direct to the cable modem, right? Wrong.

I have connected 5 different computers and one other router to the cable modem and none of them are able to obtain an IP address. Thinking there may be something I did in configuration that is hampering getting a lease, I booted various live CDs and still no IP address from the cable modem.

When I plug the ancient router back in, boom! It has a WAN IP and everything works fine.

The only commonalities here are myself and the cable modem. Seeing as the ancient router works fine, I'm inclined to think it is I who am doing something wrong.

I'm about to pull my hair out. Any suggestions?

TIA!
 
it would be interesting which cable modem you use, and how you get "into" your ISP's network.

a standard cable modem here wouldn't give you an IP address over DHCP. you would need to dial in with an PPPoE connection, and THEN you would obtain an IP.
 
It's an all-in-one by Webstar I got from the cable company. IIRC, the PPoE functionality is built-in to the modem (or not used at all) so all one needs is to connect to it.

I just don't know what to try next. I want to replace the router with something on which I can run DDWRT or Tomato. I'm afraid of throwing something out the window if I can't get it running.

I'd love to try and work with the cable company, but every time I call I get some moistened bink reading from a script or someone with a poor grasp of English.
 
Corny said:
it would be interesting which cable modem you use, and how you get "into" your ISP's network.

a standard cable modem here wouldn't give you an IP address over DHCP. you would need to dial in with an PPPoE connection, and THEN you would obtain an IP.
Click to expand...

DHCP to your cable modem is the standard in the US.

PPPoE is used on some DSL connections but some use DHCP as well.

Let me try to understand your question a bit better loosliam.

If you connect the cable modem directly to your PC, do you get an IP address? If not then the issue is either your cable modem or PC. In that case I would try another PC to see if that is able to. If not, then the cable modem is likely the issue. If so then the first PC is.

Now, if you do get an IP from the cable modem directly, next test with the router. Do you get a WAN ip on the router? If yes then you know that part works. From there, are you able to get a LAN ip on any PCs? If no, then the issue is likely on the LAN side of the router. If yes on some, then it might be the other PCs.
 
The main router obtains a WAN IP when connected to the cable modem - every time, without fail.

When a computer is connected to the cable modem, it is unable to obtain an IP. It results in the adapter being assigned the wretched APIPA IP (which I've since disabled.)

I have used 5 different physical computers connected directly to the cable modem and none were able to obtain an IP - even when booting a linux live cd. I have also swapped another router in to see if that can pull an IP and it doesn't.

I'm just so puzzled.
 
Did you power cycle the cable modem after switching the connection from the router or from one computer to the other?

I usually have to do that. First switch the ethernet to the new system/router, then reset the modem.
 
hotatlboi said:
Did you power cycle the cable modem after switching the connection from the router or from one computer to the other?

I usually have to do that. First switch the ethernet to the new system/router, then reset the modem.
Click to expand...
I have done that.

I can connect the box back into my router and it will pull an IP instantly.
 
Hmm, that is odd then.

The only other thing I can think of is, does your ISP implement MAC address registration?

This would cause only the authorized MAC address to be accepted.
 
^ this is possible if you bought the router together with the modem from your ISP.

other than that .. I would try to obtain an IP with a debug version of a DHCP client that shows in detail what's going on. or just use a sniffer.
 
^ That's where my mind is going.

The ISP does issue IPs based on a MAC address. However, the cable modem itself has a MAC address for such use.

Grrr.

Thanks for your time boys!
 
Maybe the cable modem has DHCP for lan disabled and the cable router has it enabled so the router is handing out ip addresses. So when you plug directly to modem it doesn't hand out an address. This could well be the case if the modem and router were supplied together. Modem will obtain a wan ip no prob, maybe based on it's mac address or maybe by pure dhcp but wan and lan dhcp are totally different functions.

I'm sure this was no help what so ever but at least I tried xx
 
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