Re: Help needed with intermittent internet

JM wrote:

The heart of the question, as far as I'm concerned. Comcast has suggested that the activities of our mail server is causing the problems. And I continue to repeat your question: What bearing does content and traffic in general have on the performance (or lack thereof) of a cable modem????


Have you checked for any snmp packets headed to the modem?

Most modems can also be controlled through an http interface showing to the LAN side.

Can you get to any of the modem logs at 192.168.100.1 ? How about 192.168.1.1 ?

If we could see the modem logs, we could see why it's going down. Or for that matter, confirm that it's the modem that's going down.

Just to review, and make sure we've been talking about all the same things, is this how things are set-up:

Various Computers on the LAN
|
V
The "Server" (which is acting as a router for your LAN, and is assigned your public static IP)
|
V
The Netgear, which includes a cable modem, and has routing capabilities that are turned off.
|
V
The CMTS at the headend, which has the gateway IP address for the static IP used by the server)
|
V
The rest of the world.

Numerous times you've mentioned being unable to ping the gateway. Are you talking about the CMTS at the headend, or some other device. And where are you pinging it from? The client's side of the modem, or where you are in the outside world?

You've also mentioned pinging the modem's IP. A cable modem has a class A private range IP address facing the HFC side that the provider can use to manage the modem. That 10.x.x.x address is only going to be accessible from within the Comcast network. The modem also has an internal http server (to serve pages with logs and status information) that's accessible only from the LAN side. It has a class C private range IP address (192.168.100.1). All other traffic is bridged through the modem.

If the routing capabilities of the modem are turned off, then all you've got left is the switch that's between the modem part of the Netgear, and the Ethernet port. So if the routing capabilities are turned-off, there's no IP address used for this side of the Netgear.

All in all, at this point the modem logs would probably be the most useful tool we could use.

--
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.

Maintain your landscape with Black & Decker:
http://www.holzemville.com/mall/blackanddecker




--
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.

Maintain your landscape with Black & Decker:
http://www.holzemville.com/mall/blackanddecker





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