hey,
There is no matching entry in whois for 2000::/64 (or shorter), so it is unlikely that 2000::/64 was an intended configuration.
2000::/64 has nothing to do with it.Any address between 2000:0000:0000:0000:0000:0000:0000:0000 and 23ff:ffff:ffff:ffff:ffff:ffff:ffff:ffff together with misconfigured prefix length (6 instead 64) becomes 2000::/6 prefix.
-- tarko
