North American Network Operators Group
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Re: Interesting new spam technique - getting a lot more popular.

  • From: Florian Weimer
  • Date: Wed Jun 14 12:45:43 2006 
* Christopher L. Morrow:

> On Wed, 14 Jun 2006, Suresh Ramasubramanian wrote:
>>
>> http://thespamdiaries.blogspot.com/2006/02/new-host-cloaking-technique-used-by.html
>>
>>     * Monitor your local network for interfaces transmitting ARP
>> responses they shouldn't be.
>
> how about just mac security on switch ports? limit the number of mac's at
> each port to 1 or some number 'valid' ?

The attack is not visible at layer 2, so this won't help.  You need
static ARP tables on relevant hosts, but even that is only a stopgag
measure.  Better invest into one (virtual) router port per customer
host. 8-/