Hi Youssef, My original reply wasn't sent to the Nanog list. Team Cymru considers 2002::/16 and 192.88.99.0/24 to be legitimate prefixes at this time, and will be not be adding them to our bogon filters. Our interpretation of the 6to4 anycast rfc is that while these are encouraged to be made obsolete, in practice they may still be in use, excluding them from being universally defined as a bogon in our feed. The RFC in question: https://tools.ietf.org/html/rfc7526 The rule, as it always should be, is to know your network, and know what is best for it. As noted in the RFC you are encouraged to review any current deployments and any existing filtering and adjust based on your own discretion. Regards, Gary McArtor Team Cymru On 6/28/18 2:32 PM, Rabbi Rob Thomas wrote:
FYI, the question has been raised. I'm not sure if this is wise or not. Gary, what are your thoughts?
-------- Forwarded Message -------- Subject: Re: Time to add 2002::/16 to bogon filters? Date: Thu, 28 Jun 2018 21:11:22 +0200 From: Youssef Bengelloun-Zahr <bengelly@gmail.com> To: Job Snijders <job@ntt.net> CC: NANOG [nanog@nanog.org] <nanog@nanog.org>
Hello Job,
Thank you for this feedback. I guess that NTT adopting this as a best practice will ring some bells around.
Do you know if Team Cymru has updated their filters accordingly ?
Best regards.
Le 28 juin 2018 à 20:58, Job Snijders <job@ntt.net> a écrit :
Dear alll,
Thank you all for your input. Just a heads-up - we deployed a few days ago.
NTT / AS 2914 now considers “2002::/16 le 128” and “192.88.99.0/24 le 32” to be bogon prefixes, and no longer accepts announcements for these destinations from any EBGP neighbor.
Kind regards,
Job