Comcast and MAC addresses?

Comcast and MAC addresses?

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Subject Author Date
Comcast and MAC addresses? Edward 11-03-2006
Posted by Tom Stiller on November 3, 2006, 12:30 pm
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> Bill M. wrote:
> > wrote:
> >
> > >
> > >Bill M. wrote:
> > >> On 2 Nov 2006 21:29:21 -0800, "Edward"
> > >>
> > >> >Does comcast bind the MAC address to the first thing it sees
> > >> >when the service is snabled? I bought a new router and I had
> > >> >to clone the MAC addy from the NIC I first used two years ago.
> > >> >Is that normal, or is it just a cooincidence?
> > >>
> > >> It's normal if you forgot to power cycle your cable modem.
> > >>
> > >> -- Bill
> > >
> > >I tried that, and still couldn't get an IP.
> >
> > Ok, second try.
> >
> > >> >Does comcast bind the MAC address to the first thing it sees
> > >> >when the service is snabled?
> >
> > No, but the modem binds to the first MAC address it sees after a
> > reboot.
> >
> > >> >I bought a new router and I had to clone the MAC addy from the
> > >> >NIC I first used two years ago.
> >
> > No, you didn't have to.
> >
> > >> >Is that normal, or is it just a cooincidence?
> >
> > It's not normal. What should happen is that you've turned off the
> > modem, old router, and PC. You swap out the old router for the new
> > one. You turn on the modem and wait for it to stabilize. You turn
> > on the new router and wait for it to stabilize. You turn on the PC
> > and you're ready to go. I can't tell from your description if
> > you've skipped any of those steps.
>
> That's exactly what I did.

Did you "turn off" the modem or remove power from it for about 30
seconds?
>
> >
> > On the other hand, cloning your old MAC isn't such a bad thing,
> > either, as long as the old NIC that it really belongs to is not
> > being used anymore. Is there a reason why you want to avoid
> > cloning?
>
> Its just luck that I strill have this board with this particular NIC
> in it. If I didn't have it anymore I would be shit outa luck.

No, If all else were to fail, you could just call Comcast and tell them
that you've changed computers ant that the modem doesn't recognize the
replacement. If the modem is enabled from a central database, they will
ask you for the MAC address of the replacement and "push" a new
configuration out to your modem.

--
Tom Stiller

PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
7BDA 71ED 6496 99C0 C7CF

Pure Networks
Posted by Edward on November 3, 2006, 2:47 pm
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Tom Stiller wrote:
>
> > Bill M. wrote:
> > > wrote:
> > >
> > > >
> > > >Bill M. wrote:
> > > >> On 2 Nov 2006 21:29:21 -0800, "Edward"
> > > >>
> > > >> >Does comcast bind the MAC address to the first thing it sees
> > > >> >when the service is snabled? I bought a new router and I had
> > > >> >to clone the MAC addy from the NIC I first used two years ago.
> > > >> >Is that normal, or is it just a cooincidence?
> > > >>
> > > >> It's normal if you forgot to power cycle your cable modem.
> > > >>
> > > >> -- Bill
> > > >
> > > >I tried that, and still couldn't get an IP.
> > >
> > > Ok, second try.
> > >
> > > >> >Does comcast bind the MAC address to the first thing it sees
> > > >> >when the service is snabled?
> > >
> > > No, but the modem binds to the first MAC address it sees after a
> > > reboot.
> > >
> > > >> >I bought a new router and I had to clone the MAC addy from the
> > > >> >NIC I first used two years ago.
> > >
> > > No, you didn't have to.
> > >
> > > >> >Is that normal, or is it just a cooincidence?
> > >
> > > It's not normal. What should happen is that you've turned off the
> > > modem, old router, and PC. You swap out the old router for the new
> > > one. You turn on the modem and wait for it to stabilize. You turn
> > > on the new router and wait for it to stabilize. You turn on the PC
> > > and you're ready to go. I can't tell from your description if
> > > you've skipped any of those steps.
> >
> > That's exactly what I did.
>
> Did you "turn off" the modem or remove power from it for about 30
> seconds?
> >
> > >
> > > On the other hand, cloning your old MAC isn't such a bad thing,
> > > either, as long as the old NIC that it really belongs to is not
> > > being used anymore. Is there a reason why you want to avoid
> > > cloning?
> >
> > Its just luck that I strill have this board with this particular NIC
> > in it. If I didn't have it anymore I would be shit outa luck.
>
> No, If all else were to fail, you could just call Comcast and tell them
> that you've changed computers ant that the modem doesn't recognize the
> replacement. If the modem is enabled from a central database, they will
> ask you for the MAC address of the replacement and "push" a new
> configuration out to your modem.
>
> --
> Tom Stiller
>
> PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
> 7BDA 71ED 6496 99C0 C7CF

Yes, but that would mean actually talking to those subhuman drones that
pretend to be tech support. They'll have me do all sorts of stuff;
such as turn off TVs, move the cable modem so it aligns with a certain
constellation of their choice, say ancient Hebrew chants, something
involving a Tipetan monk, and/or other assorted useless crap.


Posted by Tim McNair on November 6, 2006, 9:43 am
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> Yes, but that would mean actually talking to those subhuman drones that
> pretend to be tech support. They'll have me do all sorts of stuff;
> such as turn off TVs, move the cable modem so it aligns with a certain
> constellation of their choice, say ancient Hebrew chants, something
> involving a Tipetan monk, and/or other assorted useless crap.


My experience with them has been very good. I just bought a cable
modem--not realizing I was renting. Maybe five minutes on the phone and
I was done. My "flavor" of Comcast used to be AT&T and at that time the
service was lousy. Just built a house and the guy from Comcast that
wired the house put in a couple of amplifiers at no charge. Funny how
the same company can be so different.

Posted by Bit Twister on November 3, 2006, 12:46 pm
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On 3 Nov 2006 04:26:22 -0800, Edward wrote:

> Its just luck that I strill have this board with this particular NIC in
> it. If I didn't have it anymore I would be shit outa luck.

I would assume you could get to a command line prompt, have your dhcp
client release your DHCP lease, Power down equipment long enough to have the
cable modem loose all it's settings, power up with new nic.

It might be different in PA, but here in Texas, I moved ethernet cable
to new nic and after powerup, I got a new Comcast ip address. Power
down, swap cable back to original nic, powerup gets old ip address.

Posted by Edward on November 3, 2006, 2:59 pm
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Bit Twister wrote:
> On 3 Nov 2006 04:26:22 -0800, Edward wrote:
>
> > Its just luck that I strill have this board with this particular NIC in
> > it. If I didn't have it anymore I would be shit outa luck.
>
> I would assume you could get to a command line prompt, have your dhcp
> client release your DHCP lease, Power down equipment long enough to have the
> cable modem loose all it's settings, power up with new nic.
>
> It might be different in PA, but here in Texas, I moved ethernet cable
> to new nic and after powerup, I got a new Comcast ip address. Power
> down, swap cable back to original nic, powerup gets old ip address.

Yeah, I realize that's how its supposed to work; but for whatever
reason it didn't with me.
I powered everything down, took a crap, mase a sandwich and powered it
all back on - no IP.


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