Re: Help needed with intermittent internet


"$Bill" <news@xxxxxxxxxxxxxxxx> wrote in message
news:464272f0$0$9934$4c368faf@xxxxxxxxxxxxxxxxx
Warren H wrote:

He's using the server as his LAN router. The Netgear router isn't routing
in the lay sense of the word. That is, in the topography of his network,
it's not directing traffic here or there. It is only sitting there
between his server (which is the real router on his LAN), and the cable
modem, but it's opening packets, and repackaging them as a router does,
and not simply passing them through as a bridge would.

I didn't get that from the picture he supplied which I inserted below.
The server isn't even mentioned separately and local routing is basically
uneeded and handled by the switch. Either the Linksys or the Netgear
has to be handling the external routing.

The Linksys is handling the "external routing," in terms of your question,
although I think there is a little misunderstanding about this function.
The Netgear is the cable mode, for sure, but it also "routes" our static
public IP address to/from the Linksys, which I have configured for static IP
address, NAT, and no DHCP. DHCP is handled by the Novell server.

Some confusion surrounds exactly what functions are provided by the Netgear,
and I believe our problem is mostly one of semantics and how each of us
thinks of "router" vs "modem." The Netgear is indeed a router, at least in
terms of Comcast's system, but it's not playing that role in terms of the
subscriber network. This has caused great problems for me in my
conversations with Comcast, because my basic view is this:

- a "modem" is a device that converts/reconverts a particular type of
carrier signal to a signal that can be used by computers and networking
equipment
- a "router" is a device that specifies where network traffic goes

So, what is the Netgear doing? In my mind it's being a "modem," not a
"router." However, in Comcast's world it's very much a router. Practically
speaking, Comcast doesn't route internet traffic "to" the subscriber device
(router, switch, NIC, etc) to which their equipment is attached. They route
internet traffic "to" their device, which then "passes to" the subscriber
device.

This is how I understand it. Of course, my understanding of all this is
changing almost by the hour, so don't hesitate to shoot that one full of
holes, too.


Various computers on the LAN (I assume this includes the server)

Yes.


GET THE NETGEAR REPLACED WITH A PLAIN OLD MODEM !!!!!

My thoughts and words precisely to at least 2-3 of the Comcast support
people. However, this view reflects a misunderstanding of how Comcast (and
perhaps cable providers in general??) do things. With a business account
using a *static* IP address, there is no such beast as a "plain old modem."
Plain Old Modems are for residential and business accounts with a "dynamic"
IP address.

In the Comcast system, there is no method of assigning a static IP address
to a plain old modem.

And, what's even more frustrating, is that Comcast in my area offers exactly
ONE device for business/static provisioning: The Netgear unit we have.

jm












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