sing-box/docs/configuration/shared/dial.md

Structure

{
  "detour": "upstream-out",
  "bind_interface": "en0",
  "inet4_bind_address": "0.0.0.0",
  "inet6_bind_address": "::",
  "routing_mark": 1234,
  "reuse_addr": false,
  "connect_timeout": "5s",
  "tcp_fast_open": false,
  "tcp_multi_path": false,
  "udp_fragment": false,
  "domain_strategy": "prefer_ipv6",
  "fallback_delay": "300ms"
}

Fields

Field	Available Context
bind_interface /*bind_address /routing_mark /reuse_addr / tcp_fast_open / tcp_multi_path / udp_fragment /connect_timeout	detour not set

detour

The tag of the upstream outbound.

bind_interface

The network interface to bind to.

inet4_bind_address

The IPv4 address to bind to.

inet6_bind_address

The IPv6 address to bind to.

routing_mark

!!! error ""

Only supported on Linux.

Set netfilter routing mark.

reuse_addr

Reuse listener address.

tcp_fast_open

Enable TCP Fast Open.

tcp_multi_path

!!! warning ""

Go 1.21 required.

Enable TCP Multi Path.

udp_fragment

Enable UDP fragmentation.

connect_timeout

Connect timeout, in golang's Duration format.

A duration string is a possibly signed sequence of decimal numbers, each with optional fraction and a unit suffix, such as "300ms", "-1.5h" or "2h45m". Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".

domain_strategy

One of prefer_ipv4 prefer_ipv6 ipv4_only ipv6_only.

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

Outbound	Effected domains	Fallback Value
direct	Domain in request	Take inbound.domain_strategy if not set
others	Domain in server address	/

fallback_delay

The length of time to wait before spawning a RFC 6555 Fast Fallback connection. That is, is the amount of time to wait for connection to succeed before assuming that IPv4/IPv6 is misconfigured and falling back to other type of addresses. If zero, a default delay of 300ms is used.

Only take effect when domain_strategy is set.