Re: Advertising rented IPv4 prefix from a different ASN.

[David Bass <davidbass570 () gmail com>]

> On Aug 5, 2016, at 9:52 AM, Mark Tinka <mark.tinka () 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.