On 2008-02-10, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> I can connect the cable modem direct to a pc and using the software
> that comes with it establish a connection to the internet, but I
> wanted to have that firewall/router in between the cable modem and home
> pcs.
You could install Wireshark and capture the traffic between the
modem and the PC in the case where it works. That would tell
you the modem's MAC address and whether the modem has an IP
address or not.
> The help file that comes with the modem provides no
> information about how one talks to the modem. No ethernet
> address is supplied. However it is an ethernet device and
> connects to the pc with ethernet cable.
>
> Apparently comcast felt it wiser to provide no details and let
> its software do the connecting.
>
> But can't I learn the IP address (inward facing) of the modem?
It may not have one.
> The IP from outside is of course visible to ipconfig, when
> connecting to internet from a windows machine thru the cable
> modem, but I see nothing that indicates what its lanside
> ethernet address is.
If the PC has an IP address that is visible from the outside,
then the modem is running as a bridge and might not have an IP
address at all.
> Its obviously connecting to the pc with dhcp so setting the
> netgear to listen for dhcp seemed like it should work... but
> doesn't.
I would think that if the netgear router is a DHCP client on
its WAN interface, then connecting the WAN interface to the
cable modem should work. I've done that with a few different
router/cable-modem combinations with Comcast (nee T-W), and it
always worked. Can you trace the newtork traffic between the
netgear and the cable modem? That would require either a hub
or a properly configured managed switch, so that may not be a
simple task.
> I thought I would be able to connect to the cable modem with a
> browser and maybe learn enough to make the netgear
> router/firewall connect to it, or one of my gentoo boxes, so
> have tried a few of the semi-standard addresses other ethernet
> hubs/routers etc default to, like 192.168.0.1, 192.168.1.1 and
> a few more.
--
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