Charter ARP Leak

Rampley Jr, Jim F jim.rampley at charter.com
Mon Dec 29 17:12:34 UTC 2014




On 12/29/14, 10:49 AM, "Valdis.Kletnieks at vt.edu" <Valdis.Kletnieks at vt.edu>
wrote:

>On Mon, 29 Dec 2014 03:44:48 +0000, "Stephen R. Carter" said:
>> Here is a small excerpt I am seeing.
>> 
>> 06:04:04.760869  In 00:21:a0:fb:53:d9 > ff:ff:ff:ff:ff:ff, ethertype
>>ARP (0x0806), length 60: arp who-has 97.85.59.219 tell 97.85.58.1
>> 06:04:04.761950  In 00:21:a0:fb:53:d9 > ff:ff:ff:ff:ff:ff, ethertype
>>ARP (0x0806), length 60: arp who-has 75.135.155.27 tell 75.135.152.1
>
>The interesting thing is that they're all .1 addresses.  It's almost as if
>the one broadcast domain has at least 7 different address spaces on it.

Valdis, you are correct.  What your seeing is caused by multiple IP blocks
being assigned to the same CMTS interface.





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