Re: OpenBGPd and ARIN allocations smaller than /24

[Denis Fondras]

On Fri, Sep 11, 2015 at 05:10:42PM +0200, Peter Hessler wrote:
> I just committed an example configuration line to the sample OpenBGPd
> filter set:
> 
> allow from any inet prefix 23.128.0.0/10 prefixlen 24 - 28
> 

With OpenBSD5.7 amd64, adding this filter results in :
# bgpd -dnv
...
/etc/bgpd.conf:103: "prefix" already specified

Removing the "inet" keyword allows the config to validate.

Denis

OpenBGPd and ARIN allocations smaller than /24

[Peter Hessler]

When ARIN prepared for the IPv4-pocolypse[1], they put aside a /10 for
**smaller than /24 allocations**.  Our default ruleset will not allow
those, even though they will be for various pieces of critical dual-stack
infrastructure to help IPv6-only systems survive.

RIPE is currently[2] announcing smaller blocks to test how wide spread
acceptance of these blocks are.  The results are not so good, but better
than last time :).

I just committed an example configuration line to the sample OpenBGPd
filter set:

allow from any inet prefix 23.128.0.0/10 prefixlen 24 - 28

You may need to adjust your filter set to accept these addresses.  With
this rule, I now see the test announcements over my AMS-IX link.

According to the RIR Comparative Policy Overview 2015-02[3], no other RIR
has such a policy, so you don't need to add other filters to cover other
regions.


[1] https://www.arin.net/announcements/2014/20140130.html
[2] 
https://labs.ripe.net/Members/emileaben/has-the-routability-of-longer-than-24-prefixes-changed
[3] 
https://www.nro.net/rir-comparative-policy-overview/rir-comparative-policy-overview-2015-02#2-6

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