[Cialug] Cable Modems

[Scott Prader]

If I wanted to be sure of the conversation between the cable modem and my
linux system was about, I would employ tcpdump in the following fashion,
assuming that eth0 is the ethernet device connected to the cable modem:

$ sudo tcpdump -vv -i eth0

This should yield some clue as to what's going on.  I'd try it with both
modems to see what the difference is.

Good luck,
Scott
On Jan 24, 2016 1:59 PM, "L. V. Lammert" <lvl at omnitec.net> wrote:

> OK, .. got a weird situation:
>
> The local cable company [Charter here in St.Louis] told us they would give
> us a monthly discount if we swapped out our Docsis 3.0 Motorola modem for
> a new one. Looks like the new Cisco unit will bond 16 channels together
> for a lot higher bandwidth. OK, .. sounds good to me.
>
> The new Cisco provisions just fine and works with a laptop, but when I
> connect it to my firewall box it does not route traffic. DHCP does not
> actually assign a gateway, so I plugged in the GW that the modem gives my
> laptop. No joy, .. so I switched to static IP & GW [same as the laptop],
> no joy. Cloned the MAC address from my laptop to the linux firewall box,
> .. no joy. The old Motorola unit worked just fine via DHCP.
>
> Something has changed with this new Cisco unit - the "Link" light flashes
> green with my laptop, but YELLOW with the firewall box.
>
> Has anyone run into a situation like this?
>
>         Thanks!
>
>         Lee
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