Replace broken stun server with working one

shelikhoorequested to merge
shelikhoo/rdsys-admin:dev-replace-broken-stun-server-with-working-one into main

This merge request replace broken stun servers with stun server from https://github.com/pradt2/always-online-stun/blob/master/valid_nat_testing_hosts.txt that is tested to work for nat type discovery with tpo/anti-censorship/pluggable-transports/snowflake#40077 (comment 3366665). They have also been tested to be accessible in RU and CN.

Are we aware of any reason if some of them should not be included in our configuration, such as they have opt-ed out of that previously?

The server that is being added:

  • stun.telnyx.com:3478
  • stun.hot-chilli.net:3478
  • stun.fitauto.ru:3478
  • stun.m-online.net:3478

The server that is being removed:

  • stun.nextcloud.com:3478
  • stun.bethesda.net:3478
  • stun.nextcloud.com:443

See also: tpo/anti-censorship/pluggable-transports/snowflake#40525

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