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AT&T connection LinkSys Router 1

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WestPAGiz

Technical User
Jan 20, 2003
46
US
I have connected many of these up over the years, but this one puzzles me. The customers PC connects to the internet fine when connected directly thru the cable modem and ethernet port. When connect up the Linksys Router, you can winipcfg and release and renew to get a network address(192.168.1.101), but will not connect to the internet. All the lights show a correct connection. When you try to ping, it times out and doesn't even resolve the name to a network number. Tried reseting and even tried a static IP setting from AT&T. Went into Windows 98 and disable everything in the startup group and made sure there was nothing else running in the background. The status selection on the router does not show and IP address from AT&T. HOWEVER>>>when I hook this same router up to my network, running AT&T cable modem, it works fine. Does anyone have an ideas what would cause this?
 
Does the '98 machine connect to the internet properly if you bypass the router? Based on what you're saying I would suspect a networking problem on the 98 machine. If you choose to investigate this route, it might be worth the time to completely remove all networking components & protocols from the 98, then start over.
 
Yes the network runs fine without the linksys router. Took that router and tried it on another network and the router works fine. Been searching around and found that AT&T is starting to block access from a router unless you pay for additional addresses and the way around it is to get the MAC address off the pc (ipconfig/all) and put it into the router. Has anyone heard of this?
 
Yes, this is becoming more common. The setting should be on the last sheet of the router admin Advanced settings. Put in the mac address of the machine that was originally connected. It should be labeled as Mac Clone Address or some such thing. BTW, on the 98 machine it's 'winipcfg'.
 
Did you try powering down the modem after hooking it up to the router? I've seen that fix this problem.
 
in order to "block" routers from accessing the internet at&t would need to submit ALOT of mac id's in the DHCP server that would show them to be a router. i don't think this is possible. as far as i know the DHCP server cannot tell the difference from a NIC to a router visa versa. what you may be thinking of is that the server will not allow for more than one IP released to that account within the same "IP lease". this is what alot of providers are doing so they can make more money.

if doing your normal recycling of the modem then router doesn't work, it would have to be a router/pc issue.
 
From AT&T....
We read your email and we have heard of this problem happening with one particular modem: The Motorola SB4220. Does this customer have this modem? If so it is a known issue and the only known cure at this time is to obtain a different modem other than the Motorola SB4220. We sent a few of those out as replacement modems and we have gotten many reports the Motorola SB4220 does not work with a router. We are working on some firmware upgrades on our servers to fix that
 
From Linksys...
Yes, that is true. You need to do MAC address cloning if you have a cable internet service. Please refer to the attachment to do MAC address cloning.

Anyway, since you mentioned that your client is using a motorola surfboard modem, please try changing the LAN IP of the router. But, before you do that, make sure that the computer that you are using to access the web-based utility of the router is set to obtain an IP automatically. The modem shouldn't be connected to the router at this time. Please try using a LAN IP of 10.10.10.1. After clicking apply, close the window and restart your computer. Then, please try accessing the web-based utility of the router again through its new LAN IP of 10.10.10.1. Close the window again.

After doing all of that, please connect the modem to the router as well as all of the other computers. Then, shutdown everything for 1 minute. After that, turn on the modem followed by the router and then the computers. Check the LEDs on the router especially the WAN link LED. If everything is ok, please access the web-based utility again (10.10.10.1) and go to status tab. Check if your router got a WAN IP, DNS, and gateway IP. If everything is ok in the status tab, try surfing the net.



 
so i guess you have a different modem at your house. cool, at least we all learned something!!! have you switched modems or tried the Linksys suggestion? is it true that the SB4220 will not work with a router or is Linksys right about it? does the private 10.10.10.1 IP fix the conflict? i would really like to know.
 
Works....the Linksys procedure making it 10.10.10.1 fix the problem
 
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