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

icon
material/alert-decagram

!!! quote "Changes in sing-box 1.8.0"

:material-plus: [gso](#gso)  
:material-alert-decagram: [stack](#stack)

!!! quote ""

Only supported on Linux, Windows and macOS.

Structure

{
  "type": "tun",
  "tag": "tun-in",
  "interface_name": "tun0",
  "inet4_address": "172.19.0.1/30",
  "inet6_address": "fdfe:dcba:9876::1/126",
  "mtu": 9000,
  "gso": false,
  "auto_route": true,
  "strict_route": true,
  "inet4_route_address": [
    "0.0.0.0/1",
    "128.0.0.0/1"
  ],
  "inet6_route_address": [
    "::/1",
    "8000::/1"
  ],
  "inet4_route_exclude_address": [
    "192.168.0.0/16"
  ],
  "inet6_route_exclude_address": [
    "fc00::/7"
  ],
  "endpoint_independent_nat": false,
  "udp_timeout": "5m",
  "stack": "system",
  "include_interface": [
    "lan0"
  ],
  "exclude_interface": [
    "lan1"
  ],
  "include_uid": [
    0
  ],
  "include_uid_range": [
    "1000-99999"
  ],
  "exclude_uid": [
    1000
  ],
  "exclude_uid_range": [
    "1000-99999"
  ],
  "include_android_user": [
    0,
    10
  ],
  "include_package": [
    "com.android.chrome"
  ],
  "exclude_package": [
    "com.android.captiveportallogin"
  ],
  "platform": {
    "http_proxy": {
      "enabled": false,
      "server": "127.0.0.1",
      "server_port": 8080
    }
  },
  
  ... // Listen Fields
}

!!! note ""

You can ignore the JSON Array [] tag when the content is only one item

!!! warning ""

If tun is running in non-privileged mode, addresses and MTU will not be configured automatically, please make sure the settings are accurate.

Fields

interface_name

Virtual device name, automatically selected if empty.

inet4_address

==Required==

IPv4 prefix for the tun interface.

inet6_address

IPv6 prefix for the tun interface.

mtu

The maximum transmission unit.

gso

!!! question "Since sing-box 1.8.0"

!!! quote ""

Only supported on Linux.

Enable generic segmentation offload.

auto_route

Set the default route to the Tun.

!!! quote ""

To avoid traffic loopback, set `route.auto_detect_interface` or `route.default_interface` or `outbound.bind_interface`

!!! note "Use with Android VPN"

By default, VPN takes precedence over tun. To make tun go through VPN, enable `route.override_android_vpn`.

strict_route

Enforce strict routing rules when auto_route is enabled:

In Linux:

• Let unsupported network unreachable
• Route all connections to tun

It prevents address leaks and makes DNS hijacking work on Android.

In Windows:

• Add firewall rules to prevent DNS leak caused by Windows' ordinary multihomed DNS resolution behavior

It may prevent some applications (such as VirtualBox) from working properly in certain situations.

inet4_route_address

Use custom routes instead of default when auto_route is enabled.

inet6_route_address

Use custom routes instead of default when auto_route is enabled.

inet4_route_exclude_address

Exclude custom routes when auto_route is enabled.

inet6_route_exclude_address

Exclude custom routes when auto_route is enabled.

endpoint_independent_nat

!!! info ""

This item is only available on the gvisor stack, other stacks are endpoint-independent NAT by default.

Enable endpoint-independent NAT.

Performance may degrade slightly, so it is not recommended to enable on when it is not needed.

udp_timeout

UDP NAT expiration time in seconds, default is 300 (5 minutes).

stack

!!! quote "Changes in sing-box 1.8.0"

:material-delete-alert: The legacy LWIP stack has been deprecated and removed.

TCP/IP stack.

Stack	Description
system	Perform L3 to L4 translation using the system network stack
gvisor	Perform L3 to L4 translation using gVisor's virtual network stack
mixed	Mixed system TCP stack and gvisor UDP stack

Defaults to the mixed stack if the gVisor build tag is enabled, otherwise defaults to the system stack.

include_interface

!!! quote ""

Interface rules are only supported on Linux and require auto_route.

Limit interfaces in route. Not limited by default.

Conflict with exclude_interface.

exclude_interface

Exclude interfaces in route.

Conflict with include_interface.

include_uid

!!! quote ""

UID rules are only supported on Linux and require auto_route.

Limit users in route. Not limited by default.

include_uid_range

Limit users in route, but in range.

exclude_uid

Exclude users in route.

exclude_uid_range

Exclude users in route, but in range.

include_android_user

!!! quote ""

Android user and package rules are only supported on Android and require auto_route.

Limit android users in route.

Common user	ID
Main	0
Work Profile	10

include_package

Limit android packages in route.

exclude_package

Exclude android packages in route.

platform

Platform-specific settings, provided by client applications.

platform.http_proxy

System HTTP proxy settings.

Listen Fields

See Listen Fields for details.