High latency anycast server routing (ISP Viettel) on April 23, 2024

Hi,

Route to anycast 2 server (including ipv4 and ipv6) with high latency from ISP Viettel in Vietnam. Some devices using encrypted DNS with anycast IP such as Windows 11, mikrotik router, etc. connect very slowly, due to high latency of the anycast DNS server.

Diag: https://nextdns.io/diag/288da6e0-0153-11ef-b718-eb19a49c8347

Additionally, an ultralow greencloud-sgn (IPv6) server cannot ping.

  lightnode-sgn                     6 ms
■ greencloud-sgn                    8 ms  (ultralow1, ultralow2)
  lightnode-han                    27 ms
  greencloud-han                   33 ms
  anexia-hkg                       34 ms
  zepto-hkg                        34 ms  (anycast1)
  anexia-hkg (IPv6)                34 ms
  zepto-hkg (IPv6)                 44 ms  (anycast1)
  zepto-tpe                        48 ms
  bangmod-bkk                      58 ms
  premiumrdp-bkk                   64 ms
  lightnode-tpe                    76 ms
  zepto-tpe (IPv6)                130 ms
  zepto-lax                       184 ms  (anycast2)
  greencloud-sgn (IPv6)            error
  anycast.dns2.nextdns.io (IPv6)   error  (anycast2)
  dns1.nextdns.io (IPv6)           error  (ultralow1)
  dns2.nextdns.io (IPv6)           error  (ultralow2)

Please check and fix it! Thank you!