RFC: BOGONs over BGP, adding some ranges

Tue Aug 30 17:15:40 UTC 2022

Dear NANOG!

As many of you know, Team Cymru runs a free service delivering updated 
BOGONS to networks around the world. We've been doing this for decades 
at this point. For more information about this service, please see 
https://www.team-cymru.com/bogon.

Recently, we've discussed internally a discrepancy between our BGP based 
feed and the other formats we deliver for our Traditional BOGONS feed. 
For historic reasons, we previously omitted delivery of some ranges that 
are BOGONS from our BGP advertisements. We are considering adding the 
below ranges back in, but want to hear feedback from the community on 
these ranges prior to advertising them, out of an abundance of caution.

The below ranges are what we are currently considering advertising:
0/8 (this one we already have concluded is safe as it is already 
advertised in our "FULL BOGONS" set.)
127/8
224/4
240/4

Note that 224/4 and 240/4 may be aggregated differently in our 
advertisement, but are broken out here to facilitate discussion.

So, fellow NANOGers, what say ye? I would love to hear your feedback, 
pro or con, well-reasoned with data points or general "argh! there be 
dragons!" sentiments.

Looking forward to seeing folks in Hollywood for N86!

Cheers!

James

-- 
*James Shank*
Chief Architect of Community Services and Sr. Security Evangelist
e: jshank at cymru.com
o: +1 847 378-3365