/27 the new /24

Fri Oct 2 17:08:16 UTC 2015

There are lots of transits that will take le 32 on their customers inbound
but filter le 24 on egress announcements.

On Fri, Oct 2, 2015 at 12:47 PM, Jason Baugher <jason at thebaughers.com>
wrote:

> 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 at herrin.us> wrote:
>
> > On Fri, Oct 2, 2015 at 11:55 AM, Suresh Ramasubramanian
> > <ops.lists at 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 at dirtside.com  bill at herrin.us
> > Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
> >
>

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