[184382] in North American Network Operators' Group
Re: /27 the new /24
daemon@ATHENA.MIT.EDU (Jason Baugher)
Fri Oct 2 12:51:11 2015
X-Original-To: nanog@nanog.org
In-Reply-To: <CAP-guGWv1waCLzqy6ii6ydo+FV63gzpJ3+d+_YwKwrotijFrQg@mail.gmail.com>
Date: Fri, 2 Oct 2015 11:47:31 -0500
From: Jason Baugher <jason@thebaughers.com>
To: William Herrin <bill@herrin.us>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
Are you suggesting that the Tier 1 and 2's that I connect to are not
filtering out anything shorter than /24? My expectation is that they are
dropping shorter than /24, just like I am.
Correct me if I'm wrong, but every *NOG BGP best practices document I've
read has advocated dropping all prefixes shorter than /24 at ingress and
egress.
On Fri, Oct 2, 2015 at 11:34 AM, William Herrin <bill@herrin.us> wrote:
> On Fri, Oct 2, 2015 at 11:55 AM, Suresh Ramasubramanian
> <ops.lists@gmail.com> wrote:
> > Besides which more than one provider filters by a minimum prefix length
> > per /8 - wasn't Swisscom or someone similar doing that? So multi
> > homing with even a /24 is somewhat patchy in terms of effectiveness
>
> Hi Suresh,
>
> That hasn't been true for something like a decade. Anybody who filters
> anything shorter than /24 without also taking a default route (or the
> equivalent) is not fully connected to the Internet.
>
> Regards,
> Bill Herrin
>
>
>
> --
> William Herrin ................ herrin@dirtside.com bill@herrin.us
> Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
>
