On Mon, Dec 29, 2014 at 12:27:04PM -0500, Jay Ashworth wrote:
Valdis, you are correct. What your seeing is caused by multiple IP blocks being assigned to the same CMTS interface.
Am I incorrect, though, in believing that ARP packets should only be visible within a broadcast domain,
broadcast domain != subnet
and that because of that, they should not be being passed through a cablemodem attached to such a CMTS interface unless they're within the IP network in which that interface lives (which is probably not 0/0)?
This sounds like a firmware bug in either the CMTS or the cablemodem.
int ethernet 0/0 ip address 10.0.0.1 255.255.0.0 ip address 11.0.0.1 255.255.0.0 secondary ip address 12.0.0.1 255.255.0.0 secondary The broadcast domain will have ARP broadcasts for all three subnets. Doing it over a CMTS doesn't change that. -- Brett