Since sing-box 1.12.0

TCP

Structure

{
  "dns": {
    "servers": {
      "type": "tcp",
      "tag": "",

      "server": "",
      "server_port": 53,

      // Dial Fields
    }
  }
}

Difference from legacy TCP server

• The old server uses default outbound by default unless detour is specified; the new one uses dialer just like outbound, which is equivalent to using an empty direct outbound by default.
• The old server uses address_resolver and address_strategy to resolve the domain name in the server; the new one uses domain_resolver and domain_strategy in Dial Fields instead.

Fields

server

Required

The address of the DNS server.

If domain name is used, domain_resolver must also be set to resolve IP address.

server_port

The port of the DNS server.

53 will be used by default.

Dial Fields

See Dial Fields for details.