cable modem mac address

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Hello
I apologize in advance as I am sure this question has been asked a
thousand times but I could not find the exact answer I was looking for
googling.
I helped someone setup a router on a cable modem today and had to clone
the mac address to get it to work.
Cable provider is Comcast.  Modem Surfboard SB4100.
Is there a way to force the modem to reset to a new mac address?

Re: cable modem mac address


cdoc wrote:
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Your syntax is a bit off. I don't think you're asking to change the cable
modem's MAC address, but rather you're trying to get a new device (the
router) to work behind an cable modem that isn't being changed.

Power-down the cable modem, the router, and the computer. Wait a half a
minute or so, and then power things up in order: Modem first (let it sync),
then router, and finally the computer.

--
Warren H.

==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.

     Power Lawncare Tools for Spring Clean-up:
   http://www.holzemville.com/mall/blackanddecker /




Re: cable modem mac address


Warren wrote:
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I'd go for 10 minutes.

Re: cable modem mac address


Warren Wrote: > Power-down the cable modem, the router, and the
computer. Wait a half a
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Then, DLR wrote: "I'd go for 10 minutes"

Nope. 3-5 seconds is just fine when reseting a modem. If you're having
to wait 10 minutes for a simple power cycle to be sucessful, something
else is going on.


Re: cable modem mac address


Eric wrote:
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Around here TWC learns the Mac address at the other end and you have to
be off long enough for the head end to notice and forget the Mac. Don't
know what the polling time is but 10 minutes always works. 10 seconds
rarely does.

Re: cable modem mac address


DLR wrote:

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If the MAC hasn't changed and you're just resetting the modem to pick
up the downstream devices (router in this case), why would it have to
learn the MAC address ?

I'm not sure what the orig. problem was since it's gone from my history.



Re: cable modem mac address


$Bill wrote:
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The issue was if you change the attached "device" how long to make the
cable modem forget the MAC address of the attached device. I've found
that with TWC in central NC (this may vary greatly elsewhere), you have
to turn the modem off for 5 minutes or more to ENSURE the head end will
notice it's off and the head end forget the ONE MAC address that it will
respond to.

Any of meaning of the start of this and I misunderstood.

Re: cable modem mac address


DLR wrote:

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I don't see how the head-end is even involved if all you're trying
to do is pcik up an modem's attached device's MAC address.  I've
never had to wait more than seconds.

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I sure don't understand that sentence - if it even is one.  ;)

Re: cable modem mac address


$Bill wrote:
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Remember that the cablemodem is just a bridge. While it needs to be
provisioned for anything behind it to have permission to use the
network, it is what's behind the cablemodem that is using the network.
Thus the network needs to know what that device's MAC address is. How
quickly you'll be able to attach a new device to the cablemodem depends
on how quickly the MAC address of that device can be acquired.

That said, it shouldn't take more than a few seconds. If it's taking
more than a few seconds, something is wrong.

--
Warren H.

==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.

     Power Lawncare Tools for Spring Clean-up:
   http://www.holzemville.com/mall/blackanddecker /




Re: cable modem mac address


On 04/11/06 02:26 am DLR wrote:

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ISTR that both with OptimumOnline (NY Metro area ISP) and with Charter
in MI (where I "recycled" the modem I'd used with OOL), the ISP had to
take note of the cable modem's MAC address and authorize/configure that
specific device. Otherwise, how do they prevent Fred Freeloader down the
street from buying a cable modem, hooking it up, and getting free
broadband Internet access? Or how do they prevent me from buying a
second cable modem, hooking it up, and getting double the bandwidth free?

Perce

Re: cable modem mac address



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You're getting off on another direction. The discussion was about the
MAC address of a device behind the cablemodem, not the cablemodem's MAC
address. But yes, the cablemodem's MAC address needs to be provisioned
on the network in order to get access to the Internet. Most ISP's now
use bottom-up provisioning, that is you plug in the cablemodem, the
network recognizes that it's not provisioned, and you're sent to an
online provisioning system where you need to enter your account number
and other identifying information in order to automatically provision
the cablemodem.

--
Warren H.

==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.

     Power Lawncare Tools for Spring Clean-up:
   http://www.holzemville.com/mall/blackanddecker /




Re: cable modem mac address


The router does this during its setup process.  At least mine does.
When I set up my DLink router and Surfboard 4100 modem, in one of the
router's setup screens there is a button to click to "clone MAC address".

Ken

cdoc wrote:

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Re: cable modem mac address


On Thu, 23 Mar 2006 09:56:48 -0500, "Kenneth J. Harris"

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That doesn't mean you need to click it.


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