nanog mailing list archives
Re: /27 the new /24
From: Michael Still <stillwaxin () gmail com>
Date: Fri, 2 Oct 2015 13:08:16 -0400
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 () 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 () 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 effectivenessHi 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/>
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Current thread:
- AW: AW: /27 the new /24, (continued)
- AW: AW: /27 the new /24 Jürgen Jaritsch (Oct 03)
- Re: /27 the new /24 Daniel Suchy (Oct 02)
- Re: /27 the new /24 William Herrin (Oct 02)
- Re: /27 the new /24 Suresh Ramasubramanian (Oct 02)
- Re: /27 the new /24 William Herrin (Oct 02)
- Re: /27 the new /24 Jason Baugher (Oct 02)
- Re: /27 the new /24 William Herrin (Oct 02)
- Re: /27 the new /24 Jason Baugher (Oct 02)
- Re: /27 the new /24 Jason Baugher (Oct 02)
- Re: /27 the new /24 William Herrin (Oct 02)
- Re: /27 the new /24 Suresh Ramasubramanian (Oct 02)
- Re: /27 the new /24 Michael Still (Oct 02)
- Re: /27 the new /24 Leo Bicknell (Oct 02)
- Re: /27 the new /24 Suresh Ramasubramanian (Oct 02)
- Re: /27 the new /24 Niels Bakker (Oct 02)
- Re: /27 the new /24 Justin M. Streiner (Oct 02)
- Re: /27 the new /24 Justin Parker (Oct 02)