Didn't we discuss this recently? I assume this is the Cogent<->Hurricane Electric IPv6 peering issue. See the long thread that starts here (short summary: dnsviz is singly homed to HE so can't reach Cogent IPv6 servers):
https://lists.dns-oarc.net/pipermail/dns-operations/2019-October/019276.html Shumon. On Mon, Feb 3, 2020 at 3:14 PM SM <s...@elandnews.com> wrote: > Hello, > > c.root-servers.net (2001:500:2::c) is not responding to queries over IPv6 > [1]. > > Regards, > -sm > > 1. The error from DNSViz is "arpa zone: The server(s) were not > responsive to queries over UDP. (2001:500:2::c)" > > _______________________________________________ > dns-operations mailing list > dns-operations@lists.dns-oarc.net > https://lists.dns-oarc.net/mailman/listinfo/dns-operations >
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