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

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`direct` outbound send requests directly.
### Structure
```json
{
"outbounds": [
{
"type": "direct",
"tag": "direct-out",
"override_address": "1.0.0.1",
"override_port": 53,
"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"
}
]
}
```
### Direct Fields
#### override_address
Override the connection destination address.
#### override_port
Override the connection destination port.
### 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 ""
Linux only
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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 requested domain name will be resolved to IP before routing.
`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`.