COMCAST modem: i cannot connect to Internet

Hi All,

I have a COMCAST modem configured and working with my wife's Windows
box. I am trying to connect to Internet using my Linux box but not
getting any success.
Here are details:
1. I am using DHCP with my eth0.
2. route -n returns only: 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
3. ifconfig -a returns values for eth0, l0, and sit0. My eth0 has a MAC
address but not IP address.
4. ipconfig on my Windows gives: 67.191.160.1 as the default gateway.
However, I can't ping it from my Linux box.
5. Comcast modem is ARRIS TM402P: working with Windows.

Any ideas on how to make Linux work in this case?

Thanks in advance for your help.

Sil

(E-Mail Removed) wrote:

> Hi All,
>
> I have a COMCAST modem configured and working with my wife's Windows
> box. I am trying to connect to Internet using my Linux box but not
> getting any success.
> Here are details:
> 1. I am using DHCP with my eth0.
> 2. route -n returns only: 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
> 3. ifconfig -a returns values for eth0, l0, and sit0. My eth0 has a MAC
> address but not IP address.
> 4. ipconfig on my Windows gives: 67.191.160.1 as the default gateway.
> However, I can't ping it from my Linux box.
> 5. Comcast modem is ARRIS TM402P: working with Windows.
>
> Any ideas on how to make Linux work in this case?
>
> Thanks in advance for your help.
>
> Sil

Try putting a static ip on your linux box. If that works (pings, accesses
i-net, whatever) either stick with it, or upgrade DHCP (the client
program).

poly-p man
--
There's no place like ~
Help!! I'm being Nibbled to death by cats!!!
"Cardboard is the scourge of humanity, but oh, so very tasty."

How about...

ifconfig eth0 up
dhclient eth0

any results?

--
(E-Mail Removed)
SDF Public Access UNIX System - http://sdf.lonestar.org

In article <(E-Mail Removed). com>,
<(E-Mail Removed)> wrote:
:Hi All,
:
:I have a COMCAST modem configured and working with my wife's Windows
:box. I am trying to connect to Internet using my Linux box but not
:getting any success.
:Here are details:
:1. I am using DHCP with my eth0.
:2. route -n returns only: 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
:3. ifconfig -a returns values for eth0, l0, and sit0. My eth0 has a MAC
:address but not IP address.
:4. ipconfig on my Windows gives: 67.191.160.1 as the default gateway.
:However, I can't ping it from my Linux box.
:5. Comcast modem is ARRIS TM402P: working with Windows.
:
:Any ideas on how to make Linux work in this case?

Any time you connect a different device to the Ethernet port you have to
reset the cable modem. The Arris TM402P has a battery backup, so power
cycling the modem won't reset it. Using a pen or pencil, depress the
reset button, located next to the Ethernet port on the back of the
modem. Wait a few minutes for the cable modem to regain connectivity,
then boot the computer (with Linux, it should be sufficient just to
restart networking).

Life will get a lot simpler if you use a router to connect your two
computers to the modem. No more resetting the modem, and you can use
both computers simultaneously. Just buy the router yourself. Don't
bother with Comcast's restrictive and poorly supported "Home Networking"
package.

--
Bob Nichols AT comcast.net I am "RNichols42"

In article <ecf4p1$gao$(E-Mail Removed)>,
Robert Nichols <(E-Mail Removed)> wrote:
>In article <(E-Mail Removed). com>,
> <(E-Mail Removed)> wrote:
>:Hi All,
>:
>:I have a COMCAST modem configured and working with my wife's Windows
>:box. I am trying to connect to Internet using my Linux box but not
>:getting any success.
>:Here are details:
>:1. I am using DHCP with my eth0.
>:2. route -n returns only: 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
>:3. ifconfig -a returns values for eth0, l0, and sit0. My eth0 has a MAC
>:address but not IP address.
>:4. ipconfig on my Windows gives: 67.191.160.1 as the default gateway.
>:However, I can't ping it from my Linux box.
>:5. Comcast modem is ARRIS TM402P: working with Windows.
>:
>:Any ideas on how to make Linux work in this case?
>
>Any time you connect a different device to the Ethernet port you have to
>reset the cable modem. The Arris TM402P has a battery backup, so power
>cycling the modem won't reset it. Using a pen or pencil, depress the
>reset button, located next to the Ethernet port on the back of the
>modem. Wait a few minutes for the cable modem to regain connectivity,
>then boot the computer (with Linux, it should be sufficient just to
>restart networking).
>
>Life will get a lot simpler if you use a router to connect your two
>computers to the modem. No more resetting the modem, and you can use
>both computers simultaneously. Just buy the router yourself. Don't
>bother with Comcast's restrictive and poorly supported "Home Networking"
>package.

Comcast will only assign a DHCP lease to one device at a time on a given
customer cable modem. If you want to connect more than one device at a
time, you will need a router to be that device and connect your devices
or computers to your NAT/masquerading router. Of course, you could make
your Linux box a router, but you'll need an extra network card, you'll
spend more money powering your Linux computer's extra uptime than it would
cost to buy a broadband router, and your wife is likely to complain when
your Linux box goes down.

Bridges won't work either; Comcast won't assign any DHCP leases if it sees
any STP (spanning tree) packets generated by a bridge on your end.

Howard Johnson wrote:
> In article <ecf4p1$gao$(E-Mail Removed)>,
> Robert Nichols <(E-Mail Removed)> wrote:
> >In article <(E-Mail Removed). com>,
> > <(E-Mail Removed)> wrote:
> >:Hi All,
> >:
> >:I have a COMCAST modem configured and working with my wife's Windows
> >:box. I am trying to connect to Internet using my Linux box but not
> >:getting any success.
> >:Here are details:
> >:1. I am using DHCP with my eth0.
> >:2. route -n returns only: 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
> >:3. ifconfig -a returns values for eth0, l0, and sit0. My eth0 has a MAC
> >:address but not IP address.
> >:4. ipconfig on my Windows gives: 67.191.160.1 as the default gateway.
> >:However, I can't ping it from my Linux box.
> >:5. Comcast modem is ARRIS TM402P: working with Windows.
> >:
> >:Any ideas on how to make Linux work in this case?
> >
> >Any time you connect a different device to the Ethernet port you have to
> >reset the cable modem. The Arris TM402P has a battery backup, so power
> >cycling the modem won't reset it. Using a pen or pencil, depress the
> >reset button, located next to the Ethernet port on the back of the
> >modem. Wait a few minutes for the cable modem to regain connectivity,
> >then boot the computer (with Linux, it should be sufficient just to
> >restart networking).
> >
> >Life will get a lot simpler if you use a router to connect your two
> >computers to the modem. No more resetting the modem, and you can use
> >both computers simultaneously. Just buy the router yourself. Don't
> >bother with Comcast's restrictive and poorly supported "Home Networking"
> >package.
>
> Comcast will only assign a DHCP lease to one device at a time on a given
> customer cable modem. If you want to connect more than one device at a
> time, you will need a router to be that device and connect your devices
> or computers to your NAT/masquerading router. Of course, you could make
> your Linux box a router, but you'll need an extra network card, you'll
> spend more money powering your Linux computer's extra uptime than it would
> cost to buy a broadband router, and your wife is likely to complain when
> your Linux box goes down.
>
> Bridges won't work either; Comcast won't assign any DHCP leases if it sees
> any STP (spanning tree) packets generated by a bridge on your end.

Thanks guys for your suggestions. I bought a router and assigned the
MAC of my Windows PC to the router WAN side. It worked perfectly.

Cheers,
Sil