| Author |
Message |
Matt
Guest
|
 Posted:
Thu Dec 09, 2004 7:21 am Post subject:
New Computer on RCA Broadband Modem & Comcast |
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Hi All,
I brought home a new laptop today and tried to get internet out of my
RCA broadband modem.
The laptop does not get an IP address out of the modem (DHCP lookup
times out).
I thought that once the modem is provisioned (Comcast knows the MAC
address of the modem) it shouldn't matter what computer is plugged into
it.
Does the modem look for the MAC address of the NIC in the computer it
is attached to?
Help appreciated,
Matt |
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Bit Twister
Guest
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| Posted:
Thu Dec 09, 2004 7:29 am Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
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|
On 8 Dec 2004 18:21:22 -0800, Matt wrote:
| Quote: |
Does the modem look for the MAC address of the NIC in the computer it
is attached to?
|
Yes, the MAC it saw during powerup. Power down cablem modem, wait 15
sec by your watch, and power up. No connection, release/renew your
laptop connection. |
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James Knott
Guest
|
| Posted:
Thu Dec 09, 2004 8:04 am Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
Matt wrote:
| Quote: | Hi All,
I brought home a new laptop today and tried to get internet out of my
RCA broadband modem.
The laptop does not get an IP address out of the modem (DHCP lookup
times out).
I thought that once the modem is provisioned (Comcast knows the MAC
address of the modem) it shouldn't matter what computer is plugged into
it.
Does the modem look for the MAC address of the NIC in the computer it
is attached to?
|
The cable modem will likely only recognize one computer. Depending on your
cable company, you may be able to release dhcp in the old computer, before
disconnecting it and then boot up the new one, after connecting it. With
some companies, you may have to call the help line. Another and better
way, is to get one of those cheap firewall/router boxes, and have it clone
the mac address from the original computer. This way, you can have both
computers connected and you greatly increase your computer security. |
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Kimberly Murphy-Smith
Guest
|
| Posted:
Fri Dec 10, 2004 11:10 am Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
In article <1102558882.688634.327640@f14g2000cwb.googlegroups.com>,
"Matt" <mattklein123@yahoo.com> wrote:
| Quote: | Hi All,
I brought home a new laptop today and tried to get internet out of my
RCA broadband modem.
The laptop does not get an IP address out of the modem (DHCP lookup
times out).
I thought that once the modem is provisioned (Comcast knows the MAC
address of the modem) it shouldn't matter what computer is plugged into
it.
Does the modem look for the MAC address of the NIC in the computer it
is attached to?
|
Yes.
And, although it's been posted a gazillion times in this group, some
suggestions are worth repeating: GET A ROUTER AND THIS WILL NEVER
HAPPEN TO YOU AGAIN. The router's MAC becomes the MAC the cable modem
sees and thus you can switch out items behind the router as often as you
like and your modem will happily putter along.
--
Kimberly Murphy-Smith -- kamurphy@ix.netcom.com
http://members.aol.com/kimmurphy
Kimberly's Barbies: http://members.aol.com/kimmurphy/barbies.html
The AMOE Drinking Game: http://www.boomspeed.com/scarletsmith/amoedrink.html
The ATAI FAQ: http://www.boomspeed.com/scarletsmith/atai-faq.html |
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Greg
Guest
|
| Posted:
Fri Dec 10, 2004 11:25 am Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
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|
| Quote: | Does the modem look for the MAC address of the NIC in the computer it
is attached to?
Yes.
|
Comcast never cared if I was swapping computers around. I was even using one on
the USB and one on the RJ45. Whichever was on when the modem came up was the
one it used. I swapped the RJ45 between a PC and an RTV.
Finally all the swapping got to me and I got a router. |
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Guest
|
| Posted:
Fri Dec 10, 2004 8:48 pm Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
On 2004-12-10, Greg <gfretwell@aol.com> wrote:
| Quote: | Does the modem look for the MAC address of the NIC in the computer it
is attached to?
Yes.
Comcast never cared if I was swapping computers around. I was even using one on
the USB and one on the RJ45. Whichever was on when the modem came up was the
one it used. I swapped the RJ45 between a PC and an RTV.
Finally all the swapping got to me and I got a router.
|
I've changed routers a couple of times & never had a problem. When Comcast
provided a new modem & the installer did self-provisioning directly from
the computer, then I had to tell the router to use the computer's mac addr.
Probably should have done self-provisioning myself thru the router if possible. |
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Warren
Guest
|
| Posted:
Fri Dec 10, 2004 10:10 pm Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
Greg wrote:
| Quote: | Does the modem look for the MAC address of the NIC in the computer
it
is attached to?
Yes.
Comcast never cared if I was swapping computers around. I was even
using one on
the USB and one on the RJ45. Whichever was on when the modem came up
was the
one it used. I swapped the RJ45 between a PC and an RTV.
Finally all the swapping got to me and I got a router.
|
There are a couple of things to consider here. When both Comcast and
ATTBI first left @Home, to cut down on the number of support calls, they
set everyone's modem to allow for a bunch of devices to be attached to
each account. Once things stabilized, they reset the maximum number to
match the maximum number that people were paying for. So after that,
people not paying for multiple IP addresses could only connect one
device at a time.
However, even if you're only allowed to connect one device at a time,
power-cycling the modem will allow you to change what device you have
attached to it. It's just that simple!
--
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.
Blatant Plug: Black & Decker Landscaping Tools:
http://www.holzemville.com/mall/blackanddecker |
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Bill Crocker
Guest
|
| Posted:
Wed Dec 15, 2004 3:00 am Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
The cable modem should work with any computer he connects to it, so long as
it has DHCP enabled. Even an Apple for that matter.
Bill Crocker
"James Knott" <james.knott@rogers.com> wrote in message
news:vPmdnYaW7dQzXSrcRVn-tA@rogers.com...
| Quote: | Matt wrote:
Hi All,
I brought home a new laptop today and tried to get internet out of my
RCA broadband modem.
The laptop does not get an IP address out of the modem (DHCP lookup
times out).
I thought that once the modem is provisioned (Comcast knows the MAC
address of the modem) it shouldn't matter what computer is plugged into
it.
Does the modem look for the MAC address of the NIC in the computer it
is attached to?
The cable modem will likely only recognize one computer. Depending on
your
cable company, you may be able to release dhcp in the old computer, before
disconnecting it and then boot up the new one, after connecting it. With
some companies, you may have to call the help line. Another and better
way, is to get one of those cheap firewall/router boxes, and have it clone
the mac address from the original computer. This way, you can have both
computers connected and you greatly increase your computer security.
|
|
|
| Back to top |
|
|
Bill Crocker
Guest
|
| Posted:
Wed Dec 15, 2004 3:01 am Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
They don't do this in Michigan.
Bill Crocker
"Warren" <wholzem@hotmail.com> wrote in message
news:JLkud.739946$8_6.117672@attbi_s04...
| Quote: | Greg wrote:
Does the modem look for the MAC address of the NIC in the computer it
is attached to?
Yes.
Comcast never cared if I was swapping computers around. I was even using
one on
the USB and one on the RJ45. Whichever was on when the modem came up was
the
one it used. I swapped the RJ45 between a PC and an RTV.
Finally all the swapping got to me and I got a router.
There are a couple of things to consider here. When both Comcast and ATTBI
first left @Home, to cut down on the number of support calls, they set
everyone's modem to allow for a bunch of devices to be attached to each
account. Once things stabilized, they reset the maximum number to match
the maximum number that people were paying for. So after that, people not
paying for multiple IP addresses could only connect one device at a time.
However, even if you're only allowed to connect one device at a time,
power-cycling the modem will allow you to change what device you have
attached to it. It's just that simple!
--
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.
Blatant Plug: Black & Decker Landscaping Tools:
http://www.holzemville.com/mall/blackanddecker
|
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Bill
Guest
|
| Posted:
Fri Dec 17, 2004 8:57 pm Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
Hook the modem to your new machine while the laptop is on. Power cycle
the modem. You should get on fine
Be aware that several modems just recently became obsolete on the
Comcast system in this area. Any modems that do not support DOCSIS 1.1
won't work any more. These include older surfboards (3100 and down),
RCA DCM215, 315, old com21 (DXP111), and a few others.
On 8 Dec 2004 18:21:22 -0800, "Matt" <mattklein123@yahoo.com> wrote:
| Quote: | Hi All,
I brought home a new laptop today and tried to get internet out of my
RCA broadband modem.
The laptop does not get an IP address out of the modem (DHCP lookup
times out).
I thought that once the modem is provisioned (Comcast knows the MAC
address of the modem) it shouldn't matter what computer is plugged into
it.
Does the modem look for the MAC address of the NIC in the computer it
is attached to?
Help appreciated,
Matt |
|
|
| Back to top |
|
|
Bit Twister
Guest
|
| Posted:
Fri Dec 17, 2004 9:02 pm Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
On Fri, 17 Dec 2004 10:57:38 -0500, Bill wrote:
| Quote: | Hook the modem to your new machine while the laptop is on. Power cycle
the modem. You should get on fine
|
I was helping someone get their linux box running on cable and we
found we had to cick up a cmd window and do a ipconfig /release before
swaping hardware connected to the cable modem and doing the cable
modem power reset. |
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Warren
Guest
|
| Posted:
Fri Dec 17, 2004 11:32 pm Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
Bit Twister wrote:
| Quote: | On Fri, 17 Dec 2004 10:57:38 -0500, Bill wrote:
Hook the modem to your new machine while the laptop is on. Power
cycle
the modem. You should get on fine
I was helping someone get their linux box running on cable and we
found we had to cick up a cmd window and do a ipconfig /release before
swaping hardware connected to the cable modem and doing the cable
modem power reset.
|
The computer can't get a valid IP address until *after* the modem has
been power-cycled. If you turn on the computer before power-cycling the
modem, you will have to wait until either the non-routable IP address it
gets expires, or you have to manually release/renew.
The two problems with this are, 1. People usually don't have the
patience to wait for the computer to attempt an automatic renewal, and
2. People have a tendency to want to "renew ALL" (instead of just
"renew" for the Ethernet adaptor only), which also forces the dial-up
adaptor to attempt to renew an IP address using the dial-up modem,
leading to an error message.
The work-around to all of this is to power-cycle the modem while the
computer is off. Once the modem has sync'd, connect and boot the
computer. It will request an IP address. It will get one. Problems
avoided.
The same if you have a router between the computer and the modem. Start
with the modem. Then the router. Then the computer. It's not impossible
to have success not doing it 1-2-3, but the conditions must be just
right, and you may need to perform additional actions that essentially
put things back in order. If you just do 1-2-3 in order, you don't have
to worry about all those side issues that could get in the way.
--
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.
Blatant Plug: Black & Decker Landscaping Tools:
http://www.holzemville.com/mall/blackanddecker |
|
| Back to top |
|
|
Indy
Guest
|
| Posted:
Wed Dec 22, 2004 5:06 am Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
Matt Wrote:
| Quote: | Hi All,
I brought home a new laptop today and tried to get internet out of my
RCA broadband modem.
The laptop does not get an IP address out of the modem (DHCP lookup
times out).
I thought that once the modem is provisioned (Comcast knows the MAC
address of the modem) it shouldn't matter what computer is plugged
into
it.
Does the modem look for the MAC address of the NIC in the computer it
is attached to?
Help appreciated,
Matt
|
The modem will lock itself to the first mac address it sees...the way
around this is to pull the power cord on the modem, then plug it back
in (with the modem hooked up to the laptop, of course)...this will
allow you to pull an ip address with laptop.
Hope this helps :)
--
Indy
http://forums.speedguide.net |
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Chip Orange
Guest
|
| Posted:
Sun Dec 26, 2004 8:53 pm Post subject:
Re: New Computer on RCA Broadband Modem & Comcast |
|
|
I'm curious, what would happen if you tried to use one of these "obsolete"
modems that don't support docsis 1.1 now on Comcast? Nothing at all?
unpredictable?
"Bill" <cmtech@comcast.net> wrote in message
news:1103299067.37b64bcb49fa7d3aba79307df555e5ff@meganetnews2...
| Quote: | Hook the modem to your new machine while the laptop is on. Power cycle
the modem. You should get on fine
Be aware that several modems just recently became obsolete on the
Comcast system in this area. Any modems that do not support DOCSIS 1.1
won't work any more. These include older surfboards (3100 and down),
RCA DCM215, 315, old com21 (DXP111), and a few others.
On 8 Dec 2004 18:21:22 -0800, "Matt" <mattklein123@yahoo.com> wrote:
Hi All,
I brought home a new laptop today and tried to get internet out of my
RCA broadband modem.
The laptop does not get an IP address out of the modem (DHCP lookup
times out).
I thought that once the modem is provisioned (Comcast knows the MAC
address of the modem) it shouldn't matter what computer is plugged into
it.
Does the modem look for the MAC address of the NIC in the computer it
is attached to?
Help appreciated,
Matt
|
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