Charter ARP Leak
Jason Hellenthal
jhellenthal at dataix.net
Tue Dec 30 01:38:07 UTC 2014
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 at cox.net> wrote:
>
> On 12/29/2014 11:35, Brett Frankenberger wrote:
>> 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
>
> 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 != subnet" and a perceived need to explain it.
>
> [no longer germane material deleted to reduce excess baggage charges]
>
>> 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.
>
> This are not "subnets"! They are IP addresses in three different IP networks.
>
>> Doing it over a CMTS doesn't change that.
>
> Communication here perceived as hostile is apologized-for.
>
>
> --
> The unique Characteristics of System Administrators:
>
> The fact that they are infallible; and,
>
> The fact that they learn from their mistakes.
>
>
> Quis custodiet ipsos custodes
--
Jason Hellenthal
Mobile: +1 (616) 953-0176
jhellenthal at DataIX.net
JJH48-ARIN
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