nanog mailing list archives
Re: Curious Cloudflare DNS behavior
From: Havard Eidnes via NANOG <nanog () nanog org>
Date: Fri, 29 May 2020 19:51:12 +0200 (CEST)
Again, twice in 6 weeks Cloudflare DNS seems to loose complete track of usbank dot com as a domain.
All the name servers for that domain are placed in that same domain. That in itself perhaps isn't a problem. However, they also all have IPv4 addresses (no IPv6 in sight) in the same /16 which is routed as a single entity in the global routing table. Thus, if that network should fall off the net from Cloudflare's (or any other recursive resolver operator's) perspective for some reason or other, the names in that domain will all be unresolveable, and a recursive resolver which is unable to reach any of the publishing name servers will return SERVFAIL. Regards, - HÃ¥vard
Current thread:
- Curious Cloudflare DNS behavior John Sage (May 29)
- Re: Curious Cloudflare DNS behavior Havard Eidnes via NANOG (May 29)
- Re: Curious Cloudflare DNS behavior Mark Milhollan (May 30)
- Re: Curious Cloudflare DNS behavior Constantine A. Murenin (May 30)
- Re: Curious Cloudflare DNS behavior Saku Ytti (May 30)
- Re: Curious Cloudflare DNS behavior John Sage (May 30)
- Re: Curious Cloudflare DNS behavior Ryan Hamel (May 30)
- Re: Curious Cloudflare DNS behavior Joe Greco (May 30)
- Re: Curious Cloudflare DNS behavior Rubens Kuhl (May 30)
- RE: Curious Cloudflare DNS behavior Keith Medcalf (May 31)
- Re: Curious Cloudflare DNS behavior Joe Greco (May 31)
- Re: Curious Cloudflare DNS behavior Saku Ytti (May 30)