Comcast modem trouble?

Comcast modem trouble?
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Subject Author Date
Comcast modem trouble? Vey 07-27-2007
Posted by Bit Twister on July 27, 2007, 11:24 pm
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On Sat, 28 Jul 2007 03:01:53 GMT, Vey wrote:
> Bit Twister wrote:
>>
>> Change dns ip address.
>
> To *any* legimate IP address of a DNS Server? I know of several public
> DNS Servers. Would one of those do? Or do I need to use a Comcast server?

Any will do. You realy need to call and verify your modem is
registered correctly. Power reboot modem/pc should get a correct DHCP
lease with comcast dns values.

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Posted by Vey on July 28, 2007, 12:11 am
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Bit Twister wrote:
> On Sat, 28 Jul 2007 03:01:53 GMT, Vey wrote:
>> Bit Twister wrote:
>>> Change dns ip address.
>> To *any* legimate IP address of a DNS Server? I know of several public
>> DNS Servers. Would one of those do? Or do I need to use a Comcast server?
>
> Any will do. You realy need to call and verify your modem is
> registered correctly. Power reboot modem/pc should get a correct DHCP
> lease with comcast dns values.

Okay. Before I waste time. This is is Windows. No router.

IP 192.168.1.X
Subnet Mask 255.255.255.0
Default Gateway what do i put here?


DNS 64.151.103.120

And this should do it?


Posted by Vey on July 28, 2007, 8:50 am
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Vey wrote:
> Bit Twister wrote:
>> On Sat, 28 Jul 2007 03:01:53 GMT, Vey wrote:
>>> Bit Twister wrote:
>>>> Change dns ip address.
>>> To *any* legimate IP address of a DNS Server? I know of several
>>> public DNS Servers. Would one of those do? Or do I need to use a
>>> Comcast server?
>>
>> Any will do. You realy need to call and verify your modem is
>> registered correctly. Power reboot modem/pc should get a correct DHCP
>> lease with comcast dns values.
>
> Okay. Before I waste time. This is is Windows. No router.
>
> IP 192.168.1.X
> Subnet Mask 255.255.255.0
> Default Gateway what do i put here?
>
>
> DNS 64.151.103.120
>
> And this should do it?
>

Never mind. I see the setting now. I'm going to try it and see what happens.

Posted by Bit Twister on July 28, 2007, 9:10 am
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On Sat, 28 Jul 2007 04:11:31 GMT, Vey wrote:
>
> Okay. Before I waste time. This is is Windows.

Sorry, I run linux.

> No router. IP 192.168.1.X

Bad news there then. As I misunderstand it, that 192.168 ip is what
doze defaults to when it cannot figure out what to use.

I am wondering if your cable modem is a router
and you are seeing a lease from it's router.

> Default Gateway what do i put here?

If you power cycled your computer as requested, you might click up a
terminal and see what you have with the command
ipconfig /all


I do not understand how you get a ISP registration screen without a
gateway with that 192.168.1.X ip unless your cable modem has a built
in router.

You might want to hunt down a manual for that cable modem and see if
you can access cable modem's internal webpage.

> DNS 64.151.103.120

> And this should do it?

Cannot hurt to try just setting it as the only dns value.

Posted by Eric on July 28, 2007, 10:25 am
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> On Sat, 28 Jul 2007 04:11:31 GMT, Vey wrote:
>
> > Okay. Before I waste time. This is is Windows.
>
> Sorry, I run linux.
>
> > No router. IP 192.168.1.X

Make sure you don't have that configured for a static IP address.
192.168.x.x subnet is a private subnet (NAT only). Otherwise, you may
have a 192.168.100.x IP address, which is supplied by the modem when a
DHCP server is unavailable. Comcast home networking modem/gateway
combos use 192.168.0.x subnet.

>
> Bad news there then. As I misunderstand it, that 192.168 ip is what
> doze defaults to when it cannot figure out what to use.

No, the self-configuration subnet is 169.254.x.x, which is what is
typically used when a DHCP server is unavailable.

It sounds like your modem is not online, or you have a static IP
address entered for some reason.



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