sing-box/docs/configuration/inbound/direct.md

direct inbound is a tunnel server.

Structure

{
  "inbounds": [
    {
      "type": "direct",
      "tag": "direct-in",
      
      "listen": "::",
      "listen_port": 5353,
      "tcp_fast_open": false,
      "sniff": false,
      "sniff_override_destination": false,
      "domain_strategy": "prefer_ipv6",
      "udp_timeout": 300,
      
      "network": "udp",
      "override_address": "1.0.0.1",
      "override_port": 53
    }
  ]
}

Listen Fields

listen

==Required==

Listen address.

listen_port

==Required==

Listen port.

tcp_fast_open

Enable tcp fast open for listener.

sniff

Enable sniffing.

See Sniff for details.

sniff_override_destination

Override the connection destination address with the sniffed domain.

If the domain name is invalid (like tor), this will not work.

domain_strategy

One of prefer_ipv4 prefer_ipv6 ipv4_only ipv6_only.

If set, the requested domain name will be resolved to IP before routing.

If sniff_override_destination is in effect, its value will be taken as a fallback.

udp_timeout

UDP NAT expiration time in seconds, default is 300 (5 minutes).

Direct Fields

network

Listen network, one of tcp udp.

Both if empty.

override_address

Override the connection destination address.

override_port

Override the connection destination port.