sing-box/docs/configuration/route/rule_action.md

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Final actions

route

{
  "action": "route", // default
  "outbound": "",
  "network_strategy": "",
  "fallback_delay": "",
  "udp_disable_domain_unmapping": false,
  "udp_connect": false
}

route inherits the classic rule behavior of routing connection to the specified outbound.

outbound

==Required==

Tag of target outbound.

network_strategy

!!! quote ""

Only supported in graphical clients on Android and iOS with `auto_detect_interface` enabled.

Strategy for selecting network interfaces.

Only take effect if outbound is direct without outbound.bind_interface, outbound.inet4_bind_address and outbound.inet6_bind_address set.

See Dial Fields for available values.

fallback_delay

!!! quote ""

Only supported in graphical clients on Android and iOS with `auto_detect_interface` enabled and `network_strategy` set.

See Dial Fields for details.

udp_disable_domain_unmapping

If enabled, for UDP proxy requests addressed to a domain, the original packet address will be sent in the response instead of the mapped domain.

This option is used for compatibility with clients that do not support receiving UDP packets with domain addresses, such as Surge.

udp_connect

If enabled, attempts to connect UDP connection to the destination instead of listen.

route-options

{
  "action": "route-options",
  "network_strategy": "",
  "fallback_delay": "",
  "udp_disable_domain_unmapping": false,
  "udp_connect": false
}

route-options set options for routing.

reject

{
  "action": "reject",
  "method": "default", // default
  "no_drop": false
}

reject reject connections

The specified method is used for reject tun connections if sniff action has not been performed yet.

For non-tun connections and already established connections, will just be closed.

method

• default: Reply with TCP RST for TCP connections, and ICMP port unreachable for UDP packets.
• drop: Drop packets.

no_drop

If not enabled, method will be temporarily overwritten to drop after 50 triggers in 30s.

Not available when method is set to drop.

hijack-dns

{
  "action": "hijack-dns"
}

hijack-dns hijack DNS requests to the sing-box DNS module.

Non-final actions

sniff

{
  "action": "sniff",
  "sniffer": [],
  "timeout": ""
}

sniff performs protocol sniffing on connections.

For deprecated inbound.sniff options, it is considered to sniff() performed before routing.

sniffer

Enabled sniffers.

All sniffers enabled by default.

Available protocol values an be found on in Protocol Sniff

timeout

Timeout for sniffing.

300ms is used by default.

resolve

{
  "action": "resolve",
  "strategy": "",
  "server": ""
}

resolve resolve request destination from domain to IP addresses.

strategy

DNS resolution strategy, available values are: prefer_ipv4, prefer_ipv6, ipv4_only, ipv6_only.

dns.strategy will be used by default.

server

Specifies DNS server tag to use instead of selecting through DNS routing.