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bmoore

join:2012-10-12
Stittsville, ON

DCM476 will not connect to WRT54G router

Hi,
When I connect my PC directly to my DCM476 modem, the PC receives:
IP address of 24.246.4.230
Gateway 24.246.4.225

and the PC can access the internet.

When I connect my WRT54G router to the DCM476, the router gets the following:
IP address 198.84.204.160
Gateway:198.84.204.161

and I cannot access the internet via the WRT54G.

Any ideas why the router would get a different DHCP allocation?

BTW: in both cases, the DNS server is 206.248.154.22

Any insight is appreciated.
Thanks,
Brian

Dunlop

join:2011-07-13
kudos:2
Reviews:
·Bell Fibe
Do not have access to look up that specific router, but you should be able to login and under WAN there should be an option renew IP which will pass on the IP from the modem to the router.

Make sure the router itself is to DHCP to pass on the new IP to your PC

bmoore

join:2012-10-12
Stittsville, ON
Thanks.

The issue is that the WRT54G router needs a valid WAn (internet) IP addres. For some reason, the DCHP server on the ISP network will only provide a valid address when a PC is directly connected the modem. When the router is connected, the IP address handed to the router does not allow internet access.

When I connect my PCs to the router, the PCs get a valid IP address on the LAN side of the router.


Oinktastic
Let them use fibre

join:2005-08-24
Scarborough
kudos:2
Reviews:
·localphone.com
The cable modem "remembers" the MAC address of your computer's network card and won't allow another device's MAC to connect without clearing that first one from its cache/memory.

You either need to reset the cable modem, while attached to your router, and let it register the new MAC address, or you need to clone your PC's MAC address with the router so the modem thinks that it's still dealing with the same device.


Teddy Boom
k kudos Received
Premium
join:2007-01-29
Toronto, ON
kudos:21
reply to bmoore
It isn't really the modem remembering, it is Rogers DHCP server. Factory resetting the modem does cause Rogers to reset though, so that isn't an important distinction.

Often, as in your case bmoore, you are allocated 2 IP addresses, one for each of two MAC addresses (your PC and your router). 198.84.204.160 is a valid internet routable IP address, but there must be a routing problem with it. Call it a dud. To get around this you could clone your PC's MAC into your router, and then your router will pull 24.246.4.230. Alternatively you could factory reset the modem and you'll probably get new IP addresses assigned.

It could be that 198.84.204.160 is working fine, and something else is wrong with your router...
--
electronicsguru.ca/for_sale/Cablemodems

Dunlop

join:2011-07-13
kudos:2
Reviews:
·Bell Fibe
reply to bmoore
That was a step I forgot, I used to have to do this when I changed a device with Videotron.

To make it simple:

- Unplug the power from your router
- Unplug network devices from modem (PC or router) and reset the modem (or power it off then back on)
- After modem is reset, reconnect router (to modem) and power the router back on

Unless you had special configuration in the router it should automatically take the IP given to it from the modem. Your PC should automatically get the new IP from the router (assuming you have it as default to DHCP)

bmoore

join:2012-10-12
Stittsville, ON
Thanks,
Working with TS tech support, I tried this today.
first with my router as the device connecting to the modem, then
using a different laptop connecting to the modem.

- Unplug the power from your router
- Unplug network devices from modem (PC or router) and reset the modem (or power it off then back on)
- After modem is reset, reconnect router (to modem) and power the router back on

In each case, the router / laptop recieved a 198.84.204.x address and was not able to connect to the internet.

There is definitely a routing loop problem.. When I tracert to the default gateway 198.84.204.161, I get the following:

C:\Users\home>tracert 198.84.204.161

Tracing route to 198-84-204-161.cpe.teksavvy.com [198.84.204.161]
over a maximum of 30 hops:

1 7 ms 6 ms 8 ms 10.124.3.129
2 16 ms 24 ms 17 ms 66.185.91.157
3 9 ms 9 ms 8 ms fallowfield3.cable.teksavvy.com [24.52.255.78]
4 14 ms 14 ms 14 ms fallowfield3.cable.teksavvy.com [24.52.255.77]
5 13 ms 13 ms 14 ms 2120.ae0.bdr02.tor.packetflow.ca [69.196.136.65]

6 20 ms 19 ms 21 ms richmond1.cable.teksavvy.com [24.246.55.14]
7 19 ms 20 ms 19 ms richmond3.cable.teksavvy.com [24.52.255.73]
8 26 ms 25 ms 25 ms richmond3.cable.teksavvy.com [24.52.255.74]
9 26 ms 25 ms 26 ms richmond3.cable.teksavvy.com [24.52.255.73]
10 48 ms 34 ms 31 ms richmond3.cable.teksavvy.com [24.52.255.74]
11 31 ms 32 ms 31 ms richmond3.cable.teksavvy.com [24.52.255.73]
12 38 ms 40 ms 37 ms richmond3.cable.teksavvy.com [24.52.255.74]
13 37 ms 38 ms 37 ms richmond3.cable.teksavvy.com [24.52.255.73]
14 45 ms 47 ms 44 ms richmond3.cable.teksavvy.com [24.52.255.74]
15 44 ms 44 ms 45 ms richmond3.cable.teksavvy.com [24.52.255.73]
16 149 ms 119 ms 106 ms richmond3.cable.teksavvy.com [24.52.255.74]
^C
C:\Users\home>

mlord

join:2006-11-05
Nepean, ON
kudos:13
Reviews:
·Start Communicat..
Note that Teksavvy tech support don't always give the correct instructions for how to do a "factory reset" on that specific modem. Instead, just look in the manual that came with it for the details, or do this:

While the modem is powered on, push and hold the reset button on the back for 12 seconds, then release. You should see the front panel lights do a little dance at around the 10 second mark, and immediately after you release the button.

But the 198.* address issue is a different, more widespread problem. Likely hundreds of affected customers since Wednesday at midnight.

David10

join:2012-11-30
reply to bmoore
Hello,

It has been long time you posted this, may be by this time you got a solution. I am posting for other people who may face same type of problem.

I faced same problem, not only with WRT54G but also with other routers. I figured out that if I power up the router one or two minutes after the modem is turned on then everything works fine.

Thanks.

bmoore

join:2012-10-12
Stittsville, ON
Hi,

Thanks for the input.
Unfortunately, my DCM476 is mac locked... (i.e. it will only recognize the mac address of the first PC it was connected to.)

No amount of factory resetting on the modem seems to fix this.

I currently have my router cloning the mac address of my PC in order to get internet access.

This is clearly an issue where TSI should swap out the modem. (Although this issue seems to be systemic with the DCM 476)

I joined TSI in October. Since then I have experienced 2 outages (each lasting 1.5 days). I want TSI to prove connection stability before I swap out the modem. (If the monthly instability keeps up, I will not stay with TSI)

Swapping out the modem will result in 24 - 48 hours of downtime, since Rogers needs to program the new modem into their system.

mlord

join:2006-11-05
Nepean, ON
kudos:13
Reviews:
·Start Communicat..
said by bmoore:

Swapping out the modem will result in 24 - 48 hours of downtime, since Rogers needs to program the new modem into their system.

No, you're lucky on that one: should be near-zero downtime. Just keep the current modem connected until it goes offline, then swap modems.

The MAC locking thing is a source of grand confusion. I do wish TSI would do something about it. Dunno if they can, though.

mlord

join:2006-11-05
Nepean, ON
kudos:13
Reviews:
·Start Communicat..
Did you purchase the DCM476 from Teksavvy (under warranty with them for 1-year), or elsewhere?

Something to consider. I have a spare up-to-date DCM475 here that you could swap for, if you like. That would save you from buying another modem if warranty doesn't help out.

Cheers

mlord

join:2006-11-05
Nepean, ON
kudos:13
reply to bmoore
Actually, this should all be fixable with your existing modem.
I've now PM'd you with an offer to drop by and help sort things out.

-ml


JCohen
Premium
join:2010-10-19
Nepean, ON
kudos:12
Reviews:
·Start Communicat..
·TekSavvy Cable
·Rogers Hi-Speed
reply to bmoore
said by bmoore:

Hi,

Thanks for the input.
Unfortunately, my DCM476 is mac locked... (i.e. it will only recognize the mac address of the first PC it was connected to.)

No amount of factory resetting on the modem seems to fix this.

Well of course a factory reset isn't going to fix the issue because the computer is still connected to the modem.

Follow these steps;
1. Disconnect the computer from the modem.
2. Unplug the modems power.
3. Remove the MAC address clone in the router.
4. Plug the modem back in.
5. Connect the router to the modem.
6. Enjoy the internet.