29 May
2020
29 May
'20
1:51 p.m.
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, - Håvard