[Cialug] Cable Modems

[Scott Prader]

It's possible that if the receiver of ARP packets is only set to listen to
a specific frequency/length, then it might be missing or getting too much
information, thus automatically labeling the packet as 'bad' without any
proper check.  What daemons are you using for DHCP on the linux systems?

Scott
On Jan 24, 2016 2:24 PM, "L. V. Lammert" <lvl at omnitec.net> wrote:

> On Sun, 24 Jan 2016, Scott Prader wrote:
>
> > 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.
> >
> Interesting, .. continuous ARP traffic:
>
> 14:18:22.846669 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
> 71-14-186-212.dhcp.stls.mo.charter.com tell
> 71-14-176-1.dhcp.stls.mo.charter.com, length 46
>
> Might the ARP configuration be different between the laptop (w/Network
> Manager) and the firewall system (static configuration)?
>
>         TFTR!
>
>         Lee
> _______________________________________________
> Cialug mailing list
> Cialug at cialug.org
> http://cialug.org/mailman/listinfo/cialug
>