Can't connect DD-WRT Router to Comcast

Discussion:

Jim

2010-09-13 17:19:42 UTC

FC13 / KDE-4

I cannot get a Linksys WRT54G with DD-WRT or a Linksys WRT160N to
connect to a Arris TM602G/CT Modem.

1. I have called Comcast and they swear that the connection is not
registered to my PC MAC address.

2. I cloned the PC mac address in my DD-WRT/Router.

3. I have pulled the battery out of the Cable Modem , reset,
disconnected power cord and ethernet cable and wait 1 minute before
plugging modem back in.
And put in ethernet cable and powered modem back up.

4. I then powered up the Router and reset it and I get no WAN IP
addresses in router.
PC connects to router and I can login to router and check settings,
No WAN Ip's in router.
I also Cloned the PC Mac address in Router .

5. I know for sure that the WRT54G is working because I have already had
it connect to this Modem, but I had to move everything to a different room.

6. I know the Ethernet Cable is okay because, I can remove it from
router and plug it directly into PC, and reboot PC and I have a Internet
Connection, without having to pull the power plug on Modem
The ethernet cable is 25 ft. long because the Modem is up stairs
and I can't relocate it , but that should not be a problem.

Terry Polzin

2010-09-13 17:32:30 UTC

Permalink

Post by Jim
FC13 / KDE-4
I cannot get a Linksys WRT54G with DD-WRT or a Linksys WRT160N to
connect to a Arris TM602G/CT Modem.
1. I have called Comcast and they swear that the connection is not
registered to my PC MAC address.
2. I cloned the PC mac address in my DD-WRT/Router.
3. I have pulled the battery out of the Cable Modem , reset,
disconnected power cord and ethernet cable and wait 1 minute before
plugging modem back in.
And put in ethernet cable and powered modem back up.
4. I then powered up the Router and reset it and I get no WAN IP
addresses in router.
PC connects to router and I can login to router and check settings,
No WAN Ip's in router.
I also Cloned the PC Mac address in Router .
5. I know for sure that the WRT54G is working because I have already had
it connect to this Modem, but I had to move everything to a different room.
6. I know the Ethernet Cable is okay because, I can remove it from
router and plug it directly into PC, and reboot PC and I have a Internet
Connection, without having to pull the power plug on Modem
The ethernet cable is 25 ft. long because the Modem is up stairs
and I can't relocate it , but that should not be a problem.

You sure you cloned the RIGHT mac? can you get Comcast to put your real
mac into their dhcp list? Been a while since I've set up my dd-wrt but I
believe there is a inside and an outside mac addr.

Jim

2010-09-13 17:46:38 UTC

Permalink

Post by Terry Polzin

You sure you cloned the RIGHT mac? can you get Comcast to put your real
mac into their dhcp list? Been a while since I've set up my dd-wrt but I
believe there is a inside and an outside mac addr.

I checked in FC13 for the mac address for eth0 and physically entered it
in the router clone mac # .

Darr

2010-09-14 13:27:40 UTC

Permalink

Post by Jim
I checked in FC13 for the mac address for eth0 and physically
entered it in the router clone mac # .

I usually just use the 'Get Current' button if connected
to the router with the same computer. That often works
better than manually transcribing. Still, the MAC filter
*should* reset if you just unplug the modem for a half
hour or so. Then it would have the router's MAC stored,
assuming you disable the MAC Address Clone setting.
That's also assuming comcast's techs are lying to you
when they claim the computer's NIC's MAC isn't stored.

On the Basic Setup tab, is the "Assign WAN Port to
Switch" option unchecked? If that's checked I don't
think it will ask for an address.

To trouble shoot it, you could install Wireshark,
then connect your 2nd router in between the modem
and 1st router, using only LAN ports (i.e. LAN1 to
modem, LAN2 to router1, LAN3 to your computer
with a static IP, and LAN DHCP disabled on router2)
so you can watch the broadcast traffic.
Start Wireshark (whoever builds the RPMs puts it in
Applications->Internet instead of in System Tools),
on its menu use Capture->Interfaces and click Start
on your eth0 adapter; When you power up router1,
after about 20-30 seconds you should see it send a
BOOTP request to 255.255.255.255, then see the
reply from the modem. With a hub you could watch
all the traffic, but it's hard to find a real hub anymore,
expecially 100Mb, so all you *should* see are the broadcasts.

Jim

2010-09-13 17:55:39 UTC

Permalink

Post by Terry Polzin

You sure you cloned the RIGHT mac? can you get Comcast to put your real
mac into their dhcp list? Been a while since I've set up my dd-wrt but I
believe there is a inside and an outside mac addr.

Has anyone had problems with this,
http://www.fixya.com/support/t3475982-problem_arris_comcast_cable_modem

n2xssvv.g02gfr12930

2010-09-13 17:52:03 UTC

Permalink

Have you compared your PC network configuration with that of the Modem?
I'm using DD-WRT router and this provides a lot of options, and
certainly for my network configuration it will not work after being
reset. So check the following

Is the WAN connection using DHCP or fixed IP address, and the router is
configured correctly for that WAN connection.

Is the LAN side of the router configured to use DHCP or fixed IP address
range, and does this match your PC configuration.

Is the router configured to allow your PC connection, determined by MAC
addresses if set.

For the record I'm using Fedora 13 and KDE, and manage my PC/Laptop
network connections using KNetworkManager.

HTH

cpp4ever

Jim

2010-09-13 18:24:11 UTC

Permalink

Post by n2xssvv.g02gfr12930

Have you compared your PC network configuration with that of the Modem?
I'm using DD-WRT router and this provides a lot of options, and
certainly for my network configuration it will not work after being
reset. So check the following
Is the WAN connection using DHCP or fixed IP address, and the router is
configured correctly for that WAN connection.
Is the LAN side of the router configured to use DHCP or fixed IP address
range, and does this match your PC configuration.
Is the router configured to allow your PC connection, determined by MAC
addresses if set.
For the record I'm using Fedora 13 and KDE, and manage my PC/Laptop
network connections using KNetworkManager.
HTH
cpp4ever

The WAN and LAN is setup as DHCP.

But in LAN section at bottom of page it shows A DHCP Clients and it has
the MAC# of my PC and Laptop .

I also am using KDE/ NetworkManager

n2xssvv.g02gfr12930

2010-09-14 14:49:11 UTC

Permalink

Post by Jim

Post by n2xssvv.g02gfr12930

Have you compared your PC network configuration with that of the Modem?
I'm using DD-WRT router and this provides a lot of options, and
certainly for my network configuration it will not work after being
reset. So check the following
Is the WAN connection using DHCP or fixed IP address, and the router is
configured correctly for that WAN connection.
Is the LAN side of the router configured to use DHCP or fixed IP address
range, and does this match your PC configuration.
Is the router configured to allow your PC connection, determined by MAC
addresses if set.
For the record I'm using Fedora 13 and KDE, and manage my PC/Laptop
network connections using KNetworkManager.
HTH
cpp4ever

The WAN and LAN is setup as DHCP.
But in LAN section at bottom of page it shows A DHCP Clients and it has
the MAC# of my PC and Laptop .
I also am using KDE/ NetworkManager

If those MAC addresses are for the network DNS then I suspect that's
your problem and you should remove them, and let your ISP provide you
with DNS via DHCP. Basically I suspect neither your PC or your Laptop
are configured as a DNS server and therefore cannot be used to resolve
web addresses. If you do require a static DNS IP address your ISP should
provide you with one.

HTH

cpp4ever

John Aldrich

2010-09-14 10:39:36 UTC

Permalink

I had to replace my router a few months back. I happen to be on DSL, so
it's a little different. That being said, there were some changes I had to
make to my configuration as my ISP had changed the way they did things.
Check with Comcast to see if the connection is PPPOE or something else.
That is a *huge* difference...if it's PPPOE and you have it configured for
something else, it won't log in. Period.

Tim

2010-09-14 13:44:56 UTC

Permalink

Post by Jim
1. I have called Comcast and they swear that the connection is not
registered to my PC MAC address.
2. I cloned the PC mac address in my DD-WRT/Router.

Personally, I would try most strongly to get the ISP to accept the MAC
of the router, rather than the PC. Or whatever else is the first device
facing the ISP.

It saves you all the malarkey of trying to force your hardware to do odd
things to accommodate daft management in the ISP.

--
[tim at localhost ~]$ uname -r
2.6.30.10-105.2.23.fc11.i686.PAE

Don't send private replies to my address, the mailbox is ignored. I
read messages from the public lists.

Jerry Feldman

2010-09-14 15:07:50 UTC

Permalink

Post by Tim

Post by Jim
1. I have called Comcast and they swear that the connection is not
registered to my PC MAC address.
2. I cloned the PC mac address in my DD-WRT/Router.

Personally, I would try most strongly to get the ISP to accept the MAC
of the router, rather than the PC. Or whatever else is the first device
facing the ISP.
It saves you all the malarkey of trying to force your hardware to do odd
things to accommodate daft management in the ISP.

I have had various routers connected to Comcast( previously attbi,
mediaone, highway1) for a number of years. At least in my area I can
verify that Comcast does not authenticate on the MAC address of the PC.
I don't recall when they stopped doing this, might have been before
Comcast took over from ATT. But, the last two routers I had I did not
bother to clone.
One test I would do is to:
connect a laptop (preferably) or a desktop directly to the cable modem.
If the connection works, then connect the same PC to the router, and
connect the router to the cable modem. Log into the router and check to
see if it gets an IP address from Comcast.

Some other issues are with DNS. I use my router as my primary DNS, and
add the Comcast DNS servers manually, or add a public DNS server.

Also, depending on your cable modem, you might need to reboot the cable
modem when you change the physical device connected to it. While Comcast
may not authenticate on your MAC address any longer, the cable modem
itself may store the MAC address.
--
Jerry Feldman <gaf at blu.org>
Boston Linux and Unix
PGP key id: 537C5846
PGP Key fingerprint: 3D1B 8377 A3C0 A5F2 ECBB CA3B 4607 4319 537C 5846

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