linksys wrt120n and time warner cable modem

Belkin F5d7234-4 g wireless router
November 7, 2011 at 09:39:53
Specs: Vista Home Premium
I have a Linksys WRT 120n router that worked great with my satellite internet access at my old house. I've now moved and have Time Warner Cable/Phone. The only way that I can get internet access is if I use the router (I believe) as an access point (both computer and cable modem plugged into the 1-4 ports and the internet port is open). Neither Time Warner nor Linksys will assist as they both blame each other and will not support the other. I'd like to configure this properly if possible as I'd like to connect my TV to the internet as well as other devices. A couple of things I've noticed since I started this project...I believe both the modem and the router are giving out DHCP, should I disable it on the router??? Also, I've read posts elsewhere on the internet that discuss MAC address cloning though I am unclear as to what address to clone, the PC or the cable modem? I've also seen posts discussing disabling NAT...what is this and should it be done??? Thank you in advance for your help.

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#1
November 7, 2011 at 10:17:29
Connect your pc to the warner modem/router.

Do you get internet?
If so post the results of a ipconfig /all so we can see what the ip address is.

Then we can go from there.

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#2
November 7, 2011 at 10:25:15
Yes, I have internet when I do that. I'm posting from work so I will update you tomorrow with the results of the ipconfig. Thank you.

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#3
November 8, 2011 at 10:50:45
Thank you for your patience! Below is the ipconfig without the WRT120n router plugged in:

Connection-specific DNS Suffix . : wi.rr.com
Description . . . . . . . . . . . : Realtek RTL8168C(P)/8111C(P) Family PCI-E
Gigabit Ethernet NIC (NDIS 6.0)
Physical Address. . . . . . . . . : 00-24-21-15-1C-97
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::3162:1f1c:3b8b:9907%10(Preferred)
IPv4 Address. . . . . . . . . . . : xxx.135.245.82(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.240.0
Lease Obtained. . . . . . . . . . : Sunday, November 06, 2011 1:03:21 PM
Lease Expires . . . . . . . . . . : Tuesday, November 08, 2011 5:36:57 AM
Default Gateway . . . . . . . . . : xxx.135.240.1
DHCP Server . . . . . . . . . . . : xxx.37.128.1
DNS Servers . . . . . . . . . . . : xxx.18.47.61
209.18.47.62
NetBIOS over Tcpip. . . . . . . . : Enabled

This is with the WRT120n plugged in:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8168C(P)/8111C(P) Family PCI-E
Gigabit Ethernet NIC (NDIS 6.0)
Physical Address. . . . . . . . . : 00-24-21-15-1C-97
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::3162:1f1c:3b8b:9907%10(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.153.7(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

The cable modem is an Arris TM402G/110 if that helps at all.


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#4
November 8, 2011 at 11:14:34
Modem looks good.

Router does not. It is not assigning a lan ip address. I would suggest setting it back to factory defaults and then connect to it again and do another ipconfig /all

By factory default it should give you a ip address.

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#5
November 8, 2011 at 11:18:15
Thank you. I will try to do that tonight. I believe the cable modem provides DHCP too. Is that a problem that both the router and the modem are both doing it?

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#6
November 8, 2011 at 12:48:00
modem supplies a dhcp ip to the routers wan interface so no problem.

DHCP does not go thru a router unless that router also has a ip helper installed that forwards the dhcp request/ack traffic.

This is also why you need the router to be supplying ips to the lan connected stations.

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#7
November 8, 2011 at 12:55:09
That makes sense. Still doing some reading on this and I've come up with my plan for this evening...I'll reset the Linksys to factory defaults. Unplug the power to the Arris TM402G modem and remove the battery (based on some posts, this type of modem apparently holds the MAC address that it first authenticates with, my PC since that is how the Time Warner technician set it up). Then I'll plug my PC into the Linksys and clone the PC's MAC address to the Linksys. Once that is done, I'll power down the PC and the Linksys and connect everything again. Power on the Arris modem first, then the Linksys router and then the PC. Does that make sense?

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#8
November 8, 2011 at 16:21:59
I would suggest not messing with the modem. Cloning the pcs mac to the routers wan will solve that issue.

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#9
November 9, 2011 at 08:36:43
All I ended up doing to the modem was unplugging it. Still doesn't work. With the Linksys plugged in, I get an IP address of 192.168.1.100 and I have no internet access. All I have is 'Local Only'. I've just bypassed the Linksys at this point. I don't know what else to try. I have to get this working eventually. Thank you for all of your help.

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#10
November 9, 2011 at 09:30:22
You don't mention cloning your workstation mac address to the routers wan interface. Did you confirm the routers wan port is getting a ip address? Usually there is a "status" page you would review.

When you are connected to the router post the results of a ipconfig /all for review so we know you have the correct dhcp settings.

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#11
November 9, 2011 at 09:55:50
I'll try to do that tonight. I appreciate your patience :)

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