Re: Trouble setting up Cisco-UBR924 with Comcast
- From: "B. Wright" <bmwright@xxxxxxxxxxxx>
- Date: Fri, 14 Nov 2008 00:54:58 +0000 (UTC)
cbbs70a@xxxxxxxxx wrote:
All;
After having more than one cable modem fail this year, I decided to
go with something more sophisticated and picked up a Cisco-UBR924
cable router. I picked that one because it runs IOS. For the life of
me, I cannot get this thing to work with Comcast. Comcast is
completely worthless on this issue. Essentially, the cable interface
is up but the protocol goes up and down. Comcast says they can't "see"
my MAC address. Something must be missing in my config. I thought that
I could be missimg the following line, but the router does not
recognize the command "cable-modem downstream saved channel xxxxxxx".
This should be straightforward. Any help at all would be GREATLY
appreciated. I need to get this working and I have no problem paying
for help if necessary.
It's not really straight forward. I had one of these (still do
actually) and it worked fine ages ago with Time Warner. I needed a bit
of a wacky config but I believe the main problem I ran into at first was
the firmware version. Once I got the right firmware it finally worked
but when I tried to hook it to Comcrap later it did not. The interface
kept flapping up and down, the repair guy said signal was great and
figured the modem couldn't do QAM 256, which, at the time was "new", he
said a load of older Toshiba modems had to be replace when they
upgraded. Long story short, the UBR924 does QAM 256, but still never
could keep the interface up. A Motorola SB5100 was rock solid on the
same line/cable port.
The line you're talking about "downstream saved channel", I do
not believe is configurable, the modem tries to "remember" where it
locked onto a downstream channel last time it booted so it doesn't have
to search as long. I believe this is automagically saved into the
config. You probably won't ever get this working in bridging mode (and
I see you did turn that off) because I believe they try to do all sorts
of wacky crap in the config, upgrade firmwares, and who knows what else.
I highly doubt this is on the "supported" list so they're not set up to
manage it in bridge mode, I'm certain of that.
Basically, unless you want to do something crafty with H.323 so
you can use the voice ports and use it as an oversized VoIP adapter,
that's probably all it's worth. Otherwise, you have a good doorstop,
or, maybe if you want to waste a lot of time you can figure out the
magical IOS version and config. My advice is don't waste time with it,
get another cheap modem (I never had problems with the Motorola SB5xxx),
then use a Cisco with two ethernet ports to route if you're set on the
idea of running IOS.
.
- References:
- Trouble setting up Cisco-UBR924 with Comcast
- From: cbbs70a
- Trouble setting up Cisco-UBR924 with Comcast
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