Akamai minimum prefix length issue

Patrick W. Gilmore patrick at ianai.net
Wed May 13 19:43:32 UTC 2015

Akamai does not do this.


> On May 13, 2015, at 15:42 , Jake Mertel <jake at nobistech.net> wrote:
> Chuck,
> Just throwing this out there as a possibility, I've seen similar issues
> with other ISPs wherein the root cause was their BGP speaking routers using
> a filter set published by (I'm almost certain) Cisco that, among other
> things, blocks announcements of any prefix that is smaller then the minimum
> prefix size allocated from an RIR for the prefix in question. If you look
> at https://www.arin.net/knowledge/ip_blocks.html you will see that they now
> say "All prefixes have the potential to have a /24 minimum size allocation
> issued from them.", but this was not always the case. For example, looking
> at the archive.org copy of that page from
> https://web.archive.org/web/20140107021136/https://www.arin.net/knowledge/ip_blocks.html
> on January 7, 2014, the smallest prefix they allocated from 162/8 was a
> /22. I did some quick google'ing but was unable to find a copy of the
> filter set in question. I poked a few of my colleagues and will  let you
> know if I'm able to find a copy for reference.
> --Jake
> On Wed, May 13, 2015 at 12:33 PM, Chuck Church <chuckchurch at gmail.com>
> wrote:
>> Anyone from Akamai (or who might know),
>>        Having an issue with AS 20940 either not seeing or ignoring a /23
>> we're announcing, and following a /22 to another path.  Other ISPs our
>> upstream peers with see the /23.  I didn't see a looking glass for Akamai
>> to
>> verify.  Anyone from Akamai able to help?  Prefix in question is
>> Thanks,
>> Chuck

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