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

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!!! error ""
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Linux and Windows only
### Structure
```json
{
"inbounds": [
{
"type": "tun",
"tag": "tun-in",
"inet4_address": "172.19.0.1/30",
"inet6_address": "fdfe:dcba:9876::1/128",
"mtu": 1500,
"auto_route": true,
"sniff": true,
"sniff_override_destination": false,
"domain_strategy": "prefer_ipv4"
}
]
}
```
### Tun Fields
#### inet4_address
==Required==
IPv4 prefix for the tun interface.
#### inet6_address
IPv6 prefix for the tun interface.
#### mtu
The maximum transmission unit.
#### auto_route
Set the default route to the Tun.
!!! error ""
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To avoid traffic loopback, set `route.auto_detect_interface` or `route.default_interface` or `outbound.bind_interface`
### Listen Fields
#### sniff
Enable sniffing.
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See [Sniff](/configuration/route/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.