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

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---
status: new
---
!!! quote "Changes in sing-box 1.11.0"
:material-plus: [network_strategy](#network_strategy)
:material-alert: [fallback_delay](#fallback_delay)
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### Structure
```json
{
"detour": "upstream-out",
"bind_interface": "en0",
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"inet4_bind_address": "0.0.0.0",
"inet6_bind_address": "::",
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"routing_mark": 1234,
"reuse_addr": false,
"connect_timeout": "5s",
"tcp_fast_open": false,
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"tcp_multi_path": false,
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"udp_fragment": false,
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"domain_strategy": "prefer_ipv6",
"network_strategy": "default",
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"fallback_delay": "300ms"
}
```
### Fields
#### detour
The tag of the upstream outbound.
If enabled, all other fields will be ignored.
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#### bind_interface
The network interface to bind to.
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#### inet4_bind_address
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The IPv4 address to bind to.
#### inet6_bind_address
The IPv6 address to bind to.
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#### routing_mark
!!! quote ""
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Only supported on Linux.
Set netfilter routing mark.
#### reuse_addr
Reuse listener address.
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#### tcp_fast_open
Enable TCP Fast Open.
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#### tcp_multi_path
!!! warning ""
Go 1.21 required.
Enable TCP Multi Path.
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#### udp_fragment
Enable UDP fragmentation.
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#### 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
Available values: `prefer_ipv4`, `prefer_ipv6`, `ipv4_only`, `ipv6_only`.
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If set, the requested domain name will be resolved to IP before connect.
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| Outbound | Effected domains | Fallback Value |
|----------|--------------------------|-------------------------------------------|
| `direct` | Domain in request | Take `inbound.domain_strategy` if not set |
| others | Domain in server address | / |
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#### network_strategy
!!! question "Since sing-box 1.11.0"
!!! quote ""
Only supported in graphical clients on Android and iOS with `auto_detect_interface` enabled.
Strategy for selecting network interfaces.
Available values:
- `default` (default): Connect to the default interface.
- `fallback`: Try all other interfaces when timeout.
- `hybrid`: Connect to all interfaces concurrently and choose the fastest one.
- `wifi`: Prioritize WIFI, but try all other interfaces when unavailable or timeout.
- `cellular`: Prioritize Cellular, but try all other interfaces when unavailable or timeout.
- `ethernet`: Prioritize Ethernet, but try all other interfaces when unavailable or timeout.
- `wifi_only`: Connect to WIFI only.
- `cellular_only`: Connect to Cellular only.
- `ethernet_only`: Connect to Ethernet only.
Conflicts with `bind_interface`, `inet4_bind_address` and `inet6_bind_address`.
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#### fallback_delay
The length of time to wait before spawning a RFC 6555 Fast Fallback connection.
For `domain_strategy`, is the amount of time to wait for connection to succeed before assuming
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that IPv4/IPv6 is misconfigured and falling back to other type of addresses.
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For `network_strategy`, is the amount of time to wait for connection to succeed before falling
back to other interfaces.
Only take effect when `domain_strategy` or `network_strategy` is set.
`300ms` is used by default.