Can't Reach Modem's Diagnostic Page

Can't Reach Modem's Diagnostic Page
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Subject Author Date
Can't Reach Modem's Diagnostic Page Bruce 07-29-2006
Posted by Frankster on August 16, 2006, 9:43 am
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> :Funny, I am still confused about whether the Comcast modem is supposed to
> :hand out a public or private IP. So far, for me, the two modems I have
> had
> :dealings with that are not working would hand out a private IP (i.e.
> :192.168.100.10). The only modem I have had experience with that was
> working
> :properly handed out a public IP to the computer itself (single computer
> :connected).
>
> That's as it should be. When the modem has a connection upstream, then
> it gives out the public IP that it receives via DHCP from Comcast. If
> the modem has not been able to connect upstream, then it gives out a
> private IP (with a very short lease time) so that the connected PC will
> have _some_ IP address to work with.

Thank you. That helps. Please bear with me... I had yet another terrible
experience last night with another Comcast modem and a Netgear wireless
router. (Intalling the Netgear for home lan - was single computer before).
The Netgear Wan port was never able to pic up *any* IP from the Comcast. I
verified this by going into the Netgear config and looking at the 0.0.0.0
Wan address. The attached computers (one wireless and one wire) were both
getting 192.168.1.xxx assigned by the Netgear, but had no Internet
connection (obviously).

I went through all the various recommend long power downs for the Comcast
but still no-joy. To complicate matters, this particular Comcast modem had
a battery backup built in. No on/off switch. After pulling the plug the damn
lights stayed lit for a long time. Gradually dimming until off. Except... of
all things, the power light never went off. Geeze, it's one thing after
another! (LOL!)

So, I brought the Netgear back to my home (shop) to check it out. Plugged it
into a "known good DHCP server" switch port on my network, and it works
*fine*! Picks up the wan IP right away. Dishes out an internal IP to
connected clients and works for Internet connectivity. Virtually plug and
play. Damn. Why the hell doesn't it work that way with the Comcast modem?

The only thing left I know to do is to leave the modem off for an hour or so
(instead of merely 2-5 minutes).

BTW, I did call Comcast. As far as they were concerned there should be no
MAC address issues. It should "just work".

-Frank



Pure Networks
Posted by Robert Nichols on August 16, 2006, 10:41 pm
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> Please bear with me... I had yet another terrible
>experience last night with another Comcast modem and a Netgear wireless
>router. (Intalling the Netgear for home lan - was single computer before).
>The Netgear Wan port was never able to pic up *any* IP from the Comcast. I
>verified this by going into the Netgear config and looking at the 0.0.0.0
>Wan address. The attached computers (one wireless and one wire) were both
>getting 192.168.1.xxx assigned by the Netgear, but had no Internet
>connection (obviously).
>
>I went through all the various recommend long power downs for the Comcast
>but still no-joy. To complicate matters, this particular Comcast modem had
>a battery backup built in. No on/off switch. After pulling the plug the damn
>lights stayed lit for a long time. Gradually dimming until off. Except... of
>all things, the power light never went off. Geeze, it's one thing after
>another! (LOL!)
...
>The only thing left I know to do is to leave the modem off for an hour or so
>(instead of merely 2-5 minutes).

Modems with a battery backup also have a "Reset" button. Press and hold
for 30 seconds.

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


Posted by Frankster on August 17, 2006, 9:06 am
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>>The only thing left I know to do is to leave the modem off for an hour or
>>so
>>(instead of merely 2-5 minutes).
>
> Modems with a battery backup also have a "Reset" button. Press and hold
> for 30 seconds.

Next time I'll look harder for that. Didn't see it. Wouldn't have known to
hold for 30 seconds anyway :) Thankfully I did finally succeed. Just lost a
little (more) hair, and ego... that's all! :)

Thank you.

-Frank



Posted by John Gray on August 17, 2006, 3:56 pm
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>>>The only thing left I know to do is to leave the modem off for an
>>>hour or so
>>>(instead of merely 2-5 minutes).
>>
>> Modems with a battery backup also have a "Reset" button. Press and
>> hold for 30 seconds.
>
> Next time I'll look harder for that. Didn't see it. Wouldn't have
> known to hold for 30 seconds anyway :) Thankfully I did finally
> succeed. Just lost a little (more) hair, and ego... that's all! :)
>
> Thank you.
>
> -Frank
>

Well,
I have a Motorola SBV5220 Voice-over-IP (VoIP) cable modem, and while it
does have a Standby button on the top, there is no reset button.
However, there is a small hole in the back that is marked REBOOT. One
would have to take a bent paperclip to reset it. I've just always
unplugged the power for a minute or so on other modems I've had, and
never had to reset this one. Now, at least after looking, I know it can
be reset.<G>

Posted by Frankster on August 16, 2006, 10:03 pm
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> What you are after when trying to reset any electronic device is to
> remove power long enough for all capacitors to discharge. I think the
> helpdesk's documentation has the customer power down for a minute.

Hello!

Well, I finally got the bugger installed. The customer left his modem off
all night. When I arrived everything went well. The Netgear got a public IP
from the Comcast modem, it passed out private IPs to the clients and
everything worked fine.

So.. what I learned from this (my first real experience with Comcast modems)
was, first, to make sure you have an extended power off period. Second,
check the status of the
-!*S*T*A*N*D*B*Y*!- SWITCH on the modem! Who the hell pushed THAT!!!! Who
needs a stinkin' standby switch anyway! What the hell good is it!! LOL!

Thanks everyone for their input.

-Frank



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The Federal Communications Commission (FCC)
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