Advertising rented IPv4 prefix from a different ASN.

David Bass davidbass570 at gmail.com
Fri Aug 5 14:10:41 UTC 2016


> On Aug 5, 2016, at 9:52 AM, Mark Tinka <mark.tinka at seacom.mu> wrote:
> 
> 
> 
>> On 5/Aug/16 15:40, Soon Keat Neo wrote:
>> 
>> If you are just announcing more specific address space that you've obtained
>> legitimately off their assigned address space, it should be no problem,
>> just obtain an LoA and register it on the different databases and you
>> should be set to ask your upstreams to allow the announcements.
> 
> Do people actually do this? A customer asked us to do this for them and
> we refused, because inconsistent AS has never been a thing.
> 
> I'm apprehensive about a subnet and its aggregate appearing from
> multiple AS's at the same time. But, I'm old school, so...
> 
> Mark.

I agree with you...not a great practice.  Each AS should just announce the prefix that they actually use.  The school could be used as a transit for the ISP, which may be undesirable. 


More information about the NANOG mailing list