sing-box/docs/configuration/outbound/socks.md

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`socks` outbound is a socks4/socks4a/socks5 client.
### Structure
```json
{
"outbounds": [
{
"type": "socks",
"tag": "socks-out",
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"server": "127.0.0.1",
"server_port": 1080,
"version": "5",
"username": "sekai",
"password": "admin",
"network": "udp",
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"detour": "upstream-out",
"bind_interface": "en0",
"routing_mark": 1234,
"reuse_addr": false,
"connect_timeout": "5s",
"tcp_fast_open": false,
"domain_strategy": "prefer_ipv6",
"fallback_delay": "300ms"
}
]
}
```
### Socks Fields
#### server
==Required==
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The server address.
#### server_port
==Required==
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The server port.
#### version
The Socks version, one of `4` `4a` `5`.
Socks5 used by default.
#### username
Socks username.
#### password
Socks5 password.
#### network
Enabled network
One of `tcp` `udp`.
Both is enabled by default.
### Dial Fields
#### detour
The tag of the upstream outbound.
Other dial fields will be ignored when enabled.
#### bind_interface
The network interface to bind to.
#### routing_mark
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!!! error ""
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Linux only
The iptables routing mark.
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#### reuse_addr
Reuse listener address.
#### 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 server domain name will be resolved to IP before connecting.
`dns.strategy` will be used if empty.
#### 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 IPv6 to succeed before assuming
that IPv6 is misconfigured and falling back to IPv4 if `prefer_ipv4` is set.
If zero, a default delay of 300ms is used.
Only take effect when `domain_strategy` is `prefer_ipv4` or `prefer_ipv6`.