Hi All, First I wanted to thank you for the great bgp filter guide you provide. It is awesome to see crucial information collected and published openly for everyone. I am in the process of implementing more and better filters and while looking over the bogon prefixes v4 I stumbled upon the prefix 192.88.99.0/24 . You cite rfc7562 as a reference for adding this prefix to the bogon list and therefore not accepting this prefix but as far as I can see this the rfc clearly states "Networks SHOULD NOT filter out packets whose source address is 192.88.99.1" . If I do not accept a route to 192.88.99.0/24 I effectively blackhole that network to my customers and block returning packets to 192.88.99.1 from my and my customers networks. I checked other bogon lists that I could find, like team-cymru or kees (https://github.com/coloclue/kees/blob/e353ca9a06bca19147dcc6f607290cfd593033...), who do not include 192.88.99.0/24 in their bogon prefix list. Can you tell me the reasoning behind the decision to include this prefix in your bogon list? Best Regards Julian Julian Lannert Network Engineer e-shelter services GmbH Eschborner Landstraße 100 60489 Frankfurt am Main T: +49 69 7801-2422 F: +49 69 7801-2139 julian.lannert@e-shelter.com www.e-shelter.com Geschäftsführer: Ingmar Dilßner Volker Ludwig Rupprecht Rittweger Florian Winkler Sitz der Gesellschaft: Hattersheim am Main Amtsgericht Frankfurt am Main HRB 77478 Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.