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filtering /48 is going to be necessary
- Subject: filtering /48 is going to be necessary
- From: berni at birkenwald.de (Bernhard Schmidt)
- Date: Fri, 09 Mar 2012 21:50:45 +0100
- In-reply-to: <[email protected]>
- References: <CAPWAtbJx56qyroisNYmB=0q8dDYMixfZBfQwDTVxmW=Y6mhP6w@mail.gmail.com> <[email protected]> <[email protected]>
On 09.03.2012 20:31, Owen DeLong wrote:
Hi,
> Let us not forget that there is also the issue of PA /48s being
> advertised (quasi-legitimately) for some end-user organizations that
> are multi-homed but choose not to get PI space. It is not uncommon to
> obtain a PA /48 from provider A and also advertise it from Provider
> B.
While I agree it's not uncommon, I'm not a big fan of this setup. Also,
provider A should still have his aggregate announced, which would allow
strictly filtering ISPs to reach the destination anyway.
Announcing /48s from a PA block without the covering aggregate calls for
trouble.
Bernhard