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---
icon: material/cellphone-link
---
# Client
### :material-ray-start: Introduction
For a long time, the modern usage and principles of proxy clients
for graphical operating systems have not been clearly described.
However, we can categorize them into three types:
system proxy, firewall redirection, and virtual interface.
### :material-web-refresh: System Proxy
Almost all graphical environments support system-level proxies,
which are essentially ordinary HTTP proxies that only support TCP.
| Operating System / Desktop Environment | System Proxy | Application Support |
|:---------------------------------------------|:-------------------------------------|:--------------------|
| Windows | :material-check: | :material-check: |
| macOS | :material-check: | :material-check: |
| GNOME/KDE | :material-check: | :material-check: |
| Android | ROOT or adb (permission) is required | :material-check: |
| Android/iOS (with sing-box graphical client) | via `tun.platform.http_proxy` | :material-check: |
As one of the most well-known proxy methods, it has many shortcomings:
many TCP clients that are not based on HTTP do not check and use the system proxy.
Moreover, UDP and ICMP traffics bypass the proxy.
```mermaid
flowchart LR
dns[DNS query] -- Is HTTP request? --> proxy[HTTP proxy]
dns --> leak[Leak]
tcp[TCP connection] -- Is HTTP request? --> proxy
tcp -- Check and use HTTP CONNECT? --> proxy
tcp --> leak
udp[UDP packet] --> leak
```
### :material-wall-fire: Firewall Redirection
This type of usage typically relies on the firewall or hook interface provided by the operating system,
such as Windows’ WFP, Linux’s redirect, TProxy and eBPF, and macOS’s pf.
Although it is intrusive and cumbersome to configure,
it remains popular within the community of amateur proxy open source projects like V2Ray,
due to the low technical requirements it imposes on the software.
### :material-expansion-card: Virtual Interface
All L2/L3 proxies (seriously defined VPNs, such as OpenVPN, WireGuard) are based on virtual network interfaces,
which is also the only way for all L4 proxies to work as VPNs on mobile platforms like Android, iOS.
The sing-box inherits and develops clash-premium’s TUN inbound (L3 to L4 conversion)
as the most reasonable method for performing transparent proxying.
```mermaid
flowchart TB
packet[IP Packet]
packet --> windows[Windows / macOS]
packet --> linux[Linux]
tun[TUN interface]
windows -. route .-> tun
linux -. iproute2 route/rule .-> tun
tun --> gvisor[gVisor TUN stack]
tun --> system[system TUN stack]
assemble([L3 to L4 assemble])
gvisor --> assemble
system --> assemble
assemble --> conn[TCP and UDP connections]
conn --> router[sing-box Router]
router --> direct[Direct outbound]
router --> proxy[Proxy outbounds]
router -- DNS hijack --> dns_out[DNS outbound]
dns_out --> dns_router[DNS router]
dns_router --> router
direct --> adi([auto detect interface])
proxy --> adi
adi --> default[Default network interface in the system]
default --> destination[Destination server]
default --> proxy_server[Proxy server]
proxy_server --> destination
```
## :material-cellphone-link: Examples
### Basic TUN usage for Chinese users
=== ":material-numeric-4-box: IPv4 only"
```json
{
"dns": {
"servers": [
{
"tag": "google",
"address": "tls://8.8.8.8"
},
{
"tag": "local",
"address": "223.5.5.5",
"detour": "direct"
}
],
"rules": [
{
"outbound": "any",
"server": "local"
}
],
"strategy": "ipv4_only"
},
"inbounds": [
{
"type": "tun",
"inet4_address": "172.19.0.1/30",
"auto_route": true,
"strict_route": false
}
],
"outbounds": [
// ...
{
"type": "direct",
"tag": "direct"
},
{
"type": "dns",
"tag": "dns-out"
}
],
"route": {
"rules": [
{
"protocol": "dns",
"outbound": "dns-out"
},
{
"geoip": [
"private"
],
"outbound": "direct"
}
],
"auto_detect_interface": true
}
}
```
=== ":material-numeric-6-box: IPv4 & IPv6"
```json
{
"dns": {
"servers": [
{
"tag": "google",
"address": "tls://8.8.8.8"
},
{
"tag": "local",
"address": "223.5.5.5",
"detour": "direct"
}
],
"rules": [
{
"outbound": "any",
"server": "local"
}
]
},
"inbounds": [
{
"type": "tun",
"inet4_address": "172.19.0.1/30",
"inet6_address": "fdfe:dcba:9876::1/126",
"auto_route": true,
"strict_route": false
}
],
"outbounds": [
// ...
{
"type": "direct",
"tag": "direct"
},
{
"type": "dns",
"tag": "dns-out"
}
],
"route": {
"rules": [
{
"protocol": "dns",
"outbound": "dns-out"
},
{
"geoip": [
"private"
],
"outbound": "direct"
}
],
"auto_detect_interface": true
}
}
```
=== ":material-domain-switch: FakeIP"
```json
{
"dns": {
"servers": [
{
"tag": "google",
"address": "tls://8.8.8.8"
},
{
"tag": "local",
"address": "223.5.5.5",
"detour": "direct"
},
{
"tag": "remote",
"address": "fakeip"
}
],
"rules": [
{
"outbound": "any",
"server": "local"
},
{
"query_type": [
"A",
"AAAA"
],
"server": "remote"
}
],
"fakeip": {
"enabled": true,
"inet4_range": "198.18.0.0/15",
"inet6_range": "fc00::/18"
},
"independent_cache": true
},
"inbounds": [
{
"type": "tun",
"inet4_address": "172.19.0.1/30",
"inet6_address": "fdfe:dcba:9876::1/126",
"auto_route": true,
"strict_route": true
}
],
"outbounds": [
// ...
{
"type": "direct",
"tag": "direct"
},
{
"type": "dns",
"tag": "dns-out"
}
],
"route": {
"rules": [
{
"protocol": "dns",
"outbound": "dns-out"
},
{
"geoip": [
"private"
],
"outbound": "direct"
}
],
"auto_detect_interface": true
}
}
```
### Traffic bypass usage for Chinese users
=== ":material-dns: DNS rules"
!!! info
DNS rules are optional if FakeIP is used.
```json
{
"dns": {
"servers": [
{
"tag": "google",
"address": "tls://8.8.8.8"
},
{
"tag": "local",
"address": "223.5.5.5",
"detour": "direct"
}
],
"rules": [
{
"outbound": "any",
"server": "local"
},
{
"clash_mode": "Direct",
"server": "local"
},
{
"clash_mode": "Global",
"server": "google"
},
{
"type": "logical",
"mode": "and",
"rules": [
{
"geosite": "geolocation-!cn",
"invert": true
},
{
"geosite": [
"cn",
"category-companies@cn"
],
}
],
"server": "local"
}
]
}
}
```
=== ":material-router-network: Route rules"
```json
{
"outbounds": [
{
"type": "direct",
"tag": "direct"
},
{
"type": "block",
"tag": "block"
}
],
"route": {
"rules": [
{
"type": "logical",
"mode": "or",
"rules": [
{
"protocol": "dns"
},
{
"port": 53
}
],
"outbound": "dns"
},
{
"geoip": "private",
"outbound": "direct"
},
{
"clash_mode": "Direct",
"outbound": "direct"
},
{
"clash_mode": "Global",
"outbound": "default"
},
{
"type": "logical",
"mode": "or",
"rules": [
{
"port": 853
},
{
"network": "udp",
"port": 443
},
{
"protocol": "stun"
}
],
"outbound": "block"
},
{
"type": "logical",
"mode": "and",
"rules": [
{
"geosite": "geolocation-!cn",
"invert": true
},
{
"geosite": [
"cn",
"category-companies@cn"
],
"geoip": "cn"
}
],
"outbound": "direct"
}
]
}
}
```
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