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New Ambit modem doesn't work with old Linksys router

Posted on 2007-10-03
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My old 3com cable modem died and i go a new Ambit modem from Time Warner today.  But it doesn't seem to want to talk to my Linksys router or to the Netgeat wireles access point that is connected to the router.  I've gone back to factory default settings on both the WAP and the router and power cycled them all in the proper order.  All the connections are the same, the only new thing is the router.  Any suggestions?
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Question by:DavidLibow
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by:benhanson
ID: 20012235
Generally the cable modem doesn't "talk" to the router.  The cable modem is a bridge, it is simply activated or not.  It is a layer 2 device(Physical/Data Link) whereas the router is a layer 3 device(Network).  Many cable providers would require that you call in after you receive the new modem(the Ambit) and have it activated.  Until it is, the linksys wouldn't get anywhere.

If your Ambit is actually a router, meaning it has it's own IP address and you can somehow communicate with it directly, then this would be a different story.  By directly, I mean through a web interface or telnet session, not by plugging a USB cable into the cable modem.
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by:DavidLibow
ID: 20012267
thanks Ben, I don't think this new Ambit is a router, just a modem.  The installer activated it with the ISP and i can access the internet through it.  When i go to the routers setup page i can see MAC addresses for both my computers and the MAC address for the WAP in the DHCP client list.  The router is connected to the modem via cat5 cable, and i have one laptop connected to the router via cat5 cable.  But there is no connection to the internet via the wireless.  thanks for any help!
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by:benhanson
ID: 20012304
So the ambit has more than 1 ethernet port?
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by:DavidLibow
ID: 20012317
No, only 1 ethernet port, which is connected to the router.  The router is 4 port and is described as a router/switch.  The computer, the WAP and the modem are connected to 3 of the 4 ports on the router.  Thats the way it worked for years with the old modem and the only thing that changed here is the modem.
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by:benhanson
ID: 20012331
OK, so you can see the internet if you connect a machine directly to the modem?  Did you hook up a computer to the modem first, or the linkys?  Again, some cable companies will lock in on the first MAC address that shows up on the modem and only allow it to connect to the internet.  Switching devices would require calling.  If you connected the linksys first, are you hooking up the WAN port to the cable modem?
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by:DavidLibow
ID: 20012350
I did connect the Linksys first, and I did not connect to the WAN port.  Its connected to port 4 as the old one was.  We (the installer and I) didn't change anything other than the modem, no cables or connections were changed.  Should the modem be connected to the WAN port?
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benhanson earned 2000 total points
ID: 20012362
That would be the normal thing.  The WAN port becomes the outside port, it obtains a public IP address.  It has a DHCP server and provides internal addresses to your inside clients, and does NAT translation to allow inside clients to access the public internet.

It is possible that the 3com did some of this and you were just using the linksys as switch before.  If this were the case, the DHCP server of the linksys may have been disabled.

All in all it sounds a bit goofy.
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by:DavidLibow
ID: 20012394
Yes, it is goofy.  I will move the modem to the WAN port and power cycle everything and see what happens.
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by:benhanson
benhanson earned 2000 total points
ID: 20012416
I've had some cable modem users that needed to pull the power on the modem for 5-15 minutes for it to reset whatever MAC it was locked on to.  YMMV, all the cable providers have their own methods.
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Author Comment

by:DavidLibow
ID: 20012430
It didn't take 5 minutes, i am now on the wireless access point and am connected.  Thanks!  However the second laptop that is on the wireless network still doesn't connect.  Perhaps i need to reboot it?  Step by step, wee will prevail...
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Expert Comment

by:benhanson
ID: 20012449
I would check to make sure the linksys has DHCP turned on.
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Author Comment

by:DavidLibow
ID: 20012453
OK, that did the trick.  All is well and working now.  Thanks so much!  You have saved me and my wife from having to go do our research with a deadline coming up at some sleazy internet cafe!  Your help is much appreciated.  Thanks again Ben!
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Author Comment

by:DavidLibow
ID: 20012469
Linksys still has DHCP turned on, ultimately no settings were changed on the router.  Thanks again!
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by:benhanson
ID: 20012470
No problem, have a good night
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