[177119] in North American Network Operators' Group
Re: Charter ARP Leak
daemon@ATHENA.MIT.EDU (Jason Hellenthal)
Mon Dec 29 20:38:16 2014
X-Original-To: nanog@nanog.org
From: Jason Hellenthal <jhellenthal@dataix.net>
In-Reply-To: <54A1FE18.6050100@cox.net>
Date: Mon, 29 Dec 2014 19:38:07 -0600
To: Larry Sheldon <larrysheldon@cox.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
Well sure they are subnets :-) of 0.0.0.0/4
range: 0.0.0.0 > 15.255.255.255
range b10: 0 > 268435455
range b16: 0x0 > 0xfffffff
hosts: 268435456
prefixlen: 4
mask: 240.0.0.0
Doubt anyone should ever describe them as such unless they own all that =
space though. May God rest their soul if they do.
> On Dec 29, 2014, at 19:21, Larry Sheldon <larrysheldon@cox.net> wrote:
>=20
> On 12/29/2014 11:35, Brett Frankenberger wrote:
>> On Mon, Dec 29, 2014 at 12:27:04PM -0500, Jay Ashworth wrote:
>>>>=20
>>>> Valdis, you are correct. What your seeing is caused by multiple IP
>>>> blocks being assigned to the same CMTS interface.
>>>=20
>>> Am I incorrect, though, in believing that ARP packets should only be =
visible
>>> within a broadcast domain,
>>=20
>> broadcast domain !=3D subnet
>=20
> It surprises me that in this day and age, in a forum like this that =
has an active thread about kids being taught archaic concepts, we see =
language like "broadcast domain !=3D subnet" and a perceived need to =
explain it.
>=20
> [no longer germane material deleted to reduce excess baggage charges]
>=20
>> 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
>>=20
>> The broadcast domain will have ARP broadcasts for all three subnets.
>=20
> This are not "subnets"! They are IP addresses in three different IP =
networks.
>=20
>> Doing it over a CMTS doesn't change that.
>=20
> Communication here perceived as hostile is apologized-for.
>=20
>=20
> --=20
> The unique Characteristics of System Administrators:
>=20
> The fact that they are infallible; and,
>=20
> The fact that they learn from their mistakes.
>=20
>=20
> Quis custodiet ipsos custodes
--=20
Jason Hellenthal
Mobile: +1 (616) 953-0176
jhellenthal@DataIX.net
JJH48-ARIN
