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README.md
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# Xray Subnet Mimicry (10.0.0.0/8)
> [!CAUTION]
> **EDUCATIONAL PURPOSES ONLY**
> This project is designed as a technical demonstration of Xray-core's routing capabilities and private subnet mimicry. It is NOT intended for restriction evasion or illegal activities. Use this knowledge responsibly and in compliance with your local laws.
This repository provides a minimal example of how to mimic a contiguous `10.0.0.0/8` private subnet across three distinct servers using **Xray-core** and **reverse tunneling**.
---
## Technical Deep-Dive & Architecture
### The Virtual Subnet Concept
We are constructing a "Flat Network" (Layer 3) over the public internet. Each node is an authoritative gateway for its own `/16` segment of the `10.0.0.0/8` range.
```mermaid
graph TD
subgraph Hub ["Server A (Hub / Portal) - 10.1.0.0/16"]
A_Local["🖥️ Host / Local Clients"]
A_Xray{"⚛️ Xray Core"}
A_DNS["🛡️ AdGuard (10.1.1.3)"]
A_Nginx["🌐 Nginx (10.1.1.4)"]
A_Local -- "TPROXY" --> A_Xray
A_Xray -.-> A_DNS
A_Xray -.-> A_Nginx
end
subgraph SpokeB ["Server B (Spoke / Bridge) - 10.2.0.0/16"]
B_Local["🖥️ Host / Local Clients"]
B_Xray{"⚛️ Xray Core"}
B_Local -- "TPROXY" --> B_Xray
end
subgraph SpokeC ["Server C (Spoke / Bridge) - 10.3.0.0/16"]
C_Local["🖥️ Host / Local Clients"]
C_Xray{"⚛️ Xray Core"}
C_Local -- "TPROXY" --> C_Xray
end
%% Main Tunnels
B_Xray -- "VLESS (Direct)" --> A_Xray
A_Xray -- "VLESS (Reverse)" --> B_Xray
C_Xray -- "VLESS (Direct)" --> A_Xray
A_Xray -- "VLESS (Reverse)" --> C_Xray
%% Example Routing Flow
B_Local -.-> |"1. Dest: 10.3.x.x"| B_Xray
A_Xray -.-> |"2. Route to C"| C_Xray
C_Xray -.-> |"3. Deliver"| C_Local
```
### The Science of Interception (TPROXY)
Unlike `REDIRECT` which only works for TCP and changes the destination IP to the proxy's IP, **TPROXY** (Transparent Proxy) allows the proxy to intercept both TCP and UDP while preserving the original packet headers.
* **Mechanism:** When a packet for `10.x.x.x` enters the `PREROUTING` or `OUTPUT` chain, the Linux Mangle table marks it with `0x1`.
* **Preservation:** Xray's `tunnel` inbound (which intercepts the host's traffic) uses `\"sockopt\": { \"tproxy\": \"tproxy\" }` to read the original destination IP from the socket metadata, allowing it to route the packet as if it were the intended gateway.
* **Resource:** [Linux Kernel TPROXY Documentation](https://www.kernel.org/doc/Documentation/networking/tproxy.txt)
### Policy Routing (Table 100)
While the `iptables` rules in our firewall *mark* intercepted packets (with `0x1`), marking alone does not change where a packet goes. The standard Linux routing table only cares about the destination IP. If a packet is destined for `10.3.x.x` but there is no physical route, the kernel will send it to the default gateway (the public internet), which will simply drop it.
To make the kernel route traffic based on our firewall mark, we use **Policy Routing**:
1. **The Rule (`ip rule`):** `ip rule add fwmark 1 lookup 100` tells the Linux networking stack: *"Before doing normal routing, if a packet has firewall mark 1, ignore the main routing table and use Table 100 instead."*
2. **The Table (`ip route`):** `ip route add local default dev lo table 100` populates Table 100 with a single rule: *"Treat ALL destination IPs as if they belong to this local machine (`local default`), and route them to the internal loopback interface (`dev lo`)."*
3. **The Handoff:** Because the packet is forced onto the local loopback interface, the `TPROXY` mechanism can finally grab it. Xray, which is listening on `127.0.0.1:12345` with the `tproxy` socket option, intercepts the packet and reads its original destination.
4. **Loop Prevention:** We use `sockopt: { \"mark\": 255 }` in Xray's outbounds. This "exempts" Xray's own outbound traffic from being caught by our `iptables` rules (since 255 is not 1), preventing an infinite loop where Xray proxies its own traffic.
### The Reverse Proxy Mechanism (Bridge & Portal)
To allow a server behind NAT (Spoke) to be reachable by the Hub, Xray implements a sophisticated Reverse Proxy architecture.
* **Bridge (The Spoke):** The Bridge actively initiates a connection to the Portal. It acts as the "Client" for the tunnel but functionally behaves as a server once the tunnel is open.
* **Portal (The Hub):** The Portal listens for these incoming Bridge connections. It uses a "Dummy Domain" (configured in the `reverse` object) to identify the Bridge. When a packet for Spoke B arrives at the Hub, the Hub relays it through the already-open connection from Spoke B. [Xray Reverse Proxy Documentation](https://xtls.github.io/en/config/reverse.html)
* **Multiplexing (Mux):** Xray uses [Mux.cool](https://xtls.github.io/en/development/protocols/muxcool.html) by default over these tunnels. This allows hundreds of virtual connections (TCP/UDP streams) to be packed into a single physical TLS connection between the Bridge and the Portal, significantly reducing overhead and bypassing NAT timeouts.
* **VLESS Transport:** We use VLESS with XTLS for high-performance data encapsulation. [Xray VLESS](https://xtls.github.io/en/config/outbounds/vless.html)
## Setup Guide
### Phase 0: Prerequisites (Server A only)
Before starting, Server A (the Hub) requires a valid SSL certificate for Xray's XTLS-Vision.
1. Point your domain (`A-DOMAIN`) to Server A's public IP.
2. Generate an SSL certificate (e.g., via Let's Encrypt / Certbot) so that it is available at `/etc/letsencrypt/live/A-DOMAIN/` on the host.
### Phase 1: Security & Identity
Each connection needs its own cryptographic "Key" (UUID).
1. **Generate 4 UUIDs**:
```bash
docker run --rm ghcr.io/xtls/xray-core uuid
```
2. **Mapping**:
* `UUID_B_REVERSE`: Tunnel control for Server B.
* `UUID_B_DIRECT`: Data traffic for Server B.
* `UUID_C_REVERSE`: Tunnel control for Server C.
* `UUID_C_DIRECT`: Data traffic for Server C.
### Phase 2: Host Networking (The Glue)
On **EVERY** server node:
1. **Initialize Routing**: Run [routing.sh](./routing.sh). This sets up the kernel parameters and the custom routing Table 100.
2. **Firewall Injection**: Open `/etc/ufw/before.rules` and find the `*filter` header.
**CRITICAL PLACEMENT:** Insert the contents of your node's `before.rules` file immediately after these lines. The provided files contain `COMMIT` commands and new table declarations specifically crafted to be pasted here without breaking UFW.
```bash
*filter
:ufw-before-input - [0:0]
:ufw-before-output - [0:0]
:ufw-before-forward - [0:0]
:ufw-not-local - [0:0]
# End required lines
```
**Files to Copy:**
* **Server A**: Copy [a/before.rules](./a/before.rules)
* **Server B**: Copy [b/before.rules](./b/before.rules)
* **Server C**: Copy [c/before.rules](./c/before.rules)
3. **Reload**: `sudo ufw reload`
### Phase 3: Deployment
1. **Update Configs**: In each `xray.jsonc`, replace:
* `REPLACE_WITH_UUID_...` with your generated IDs.
* `A-DOMAIN` with your public domain.
* `A-EXTERNAL-IP` with Server A's public IP.
2. **Launch**: `docker compose up -d` in the `a/`, `b/`, and `c/` directories.
*(Note: On Server A, Docker Compose automatically creates the `10.1.0.0/16` bridge network and assigns static IPs to the AdGuard (`10.1.1.3`) and Nginx (`10.1.1.4`) containers.)*
## Educational Resources & References
* **Xray-core Official Documentation:** [XTLS.github.io](https://xtls.github.io/)
* **Project X (Xray) GitHub:** [XTLS/Xray-core](https://github.com/XTLS/Xray-core)
* **Understanding TPROXY:** [Cloudflare Blog: TPROXY](https://blog.cloudflare.com/how-we-built-spectrum/) - excellent deep dive into how transparent proxying works at scale.
## Copyright & License
**Information described here** is licensed under the [CC-BY-4.0](./LICENSE).
Software and tools mentioned or used within this repository are licensed individually under their respective terms and conditions by their original authors.
---
AI Assistance: Information in this repository was enhanced and formatted with the use of Large Generative Models _(sadly, they are incapable of correctly setting up the processes described here by themselves - otherwise, this repository wouldn't exist)_.
Copyright © 2026 Vladimir Eremin
a/before.rules
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# /etc/ufw/before.rules for Server A (10.1.0.0/16)
#
# These rules MUST be placed after the default boilerplate in UFW.
# They handle the transparent interception of 10.0.0.0/8 traffic.
COMMIT
*mangle
# Create custom chains for Xray interception
:XRAY - [0:0]
:XRAY_MASK - [0:0]
:DIVERT - [0:0]
# --- PREROUTING CHAIN (Traffic from other containers/nodes) ---
# Don't intercept traffic for our own local subnet
-A XRAY -d 10.1.0.0/16 -j RETURN
# Don't intercept traffic outside the 10.0.0.0/8 mimicry range
-A XRAY ! -d 10.0.0.0/8 -j RETURN
# Avoid infinite loops by ignoring traffic already marked by Xray
-A XRAY -m mark --mark 0xff -j RETURN
# Transparently proxy UDP/TCP to Xray on port 12345 and mark with 0x1
-A XRAY -p udp -j TPROXY --on-ip 127.0.0.1 --on-port 12345 --tproxy-mark 1
-A XRAY -p tcp -j TPROXY --on-ip 127.0.0.1 --on-port 12345 --tproxy-mark 1
-A PREROUTING -j XRAY
# --- OUTPUT CHAIN (Traffic originating from the server itself) ---
# Similar logic to XRAY: exclude local, exclude non-mimicry, exclude marked
-A XRAY_MASK -d 10.1.0.0/16 -j RETURN
-A XRAY_MASK ! -d 10.0.0.0/8 -j RETURN
-A XRAY_MASK -m mark --mark 0xff -j RETURN
# Mark traffic for table 100 routing (handled by routing.sh)
-A XRAY_MASK -p udp -j MARK --set-mark 1
-A XRAY_MASK -p tcp -j MARK --set-mark 1
-A OUTPUT -j XRAY_MASK
# --- DIVERT Optimization ---
# Helps maintain established TCP connections more efficiently
-A DIVERT -j MARK --set-mark 1
-A DIVERT -j ACCEPT
-I PREROUTING -p tcp -m socket -j DIVERT
COMMIT
*filter
# Allow the traffic we've marked and intercepted to pass through the firewall
-A ufw-before-forward -s 10.1.0.0/16 -d 10.1.0.0/16 -j ACCEPT
-A ufw-before-forward -s 10.1.0.0/16 -d 10.0.0.0/8 -m mark --mark 0x1 -j ACCEPT
-A ufw-before-input -s 10.1.0.0/16 -d 10.1.0.0/16 -j ACCEPT
-A ufw-before-input -s 10.1.0.0/16 -d 10.0.0.0/8 -m mark --mark 0x1 -j ACCEPT
a/docker-compose.yaml
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name: 'a'
services:
xray:
image: ghcr.io/xtls/xray-core:26.1.23
container_name: a-xray
network_mode: host
volumes:
- ./xray.jsonc:/etc/xray/config.jsonc:ro
- /etc/letsencrypt/live:/etc/letsencrypt/live:ro
command: -c '/etc/xray/config.jsonc'
restart: unless-stopped
cap_add:
- NET_ADMIN
- NET_RAW
nginx:
image: nginxinc/nginx-unprivileged:1.29-alpine
container_name: a-nginx
networks:
direct:
ipv4_address: 10.1.1.4
restart: unless-stopped
security_opt:
- no-new-privileges:true
adguard:
image: adguard/adguardhome:v0.107.72
container_name: root-adguard
volumes:
- adguard-work:/opt/adguardhome/work
- adguard-conf:/opt/adguardhome/conf
networks:
direct:
ipv4_address: 10.1.1.3
restart: unless-stopped
cap_add:
- NET_BIND_SERVICE
- SYS_NICE
- CAP_CHOWN
security_opt:
- no-new-privileges:true
networks:
direct:
name: a-direct
driver: bridge
ipam:
config:
- subnet: 10.1.0.0/16 # Using the full /16 as defined for Server A
gateway: 10.1.0.1
volumes:
adguard-work:
name: a-adguard-work
adguard-conf:
name: a-adguard-conf
a/xray.jsonc
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{
// ==========================================
// SERVER A: CENTRAL HUB (Subnet: 10.1.0.0/16)
// ==========================================
// This node is the "Master Router" for your 10.0.0.0/8 mimicry.
// It handles:
// 1. Inbound connections from Spokes (B & C).
// 2. DNS Resolution (via AdGuard Home).
// 3. Routing between all 10.x.x.x subnets.
"log": {
"loglevel": "info"
},
"dns": {
"servers": [
// Centralized DNS for the entire 10.0.0.0/8 network.
// AdGuard Home is expected to be reachable at 10.1.1.3.
"10.1.1.3"
]
},
"inbounds": [
{
// MAIN PUBLIC INBOUND
// Listens on 443 for incoming connections from Server B and C.
// Uses VLESS with XTLS-Vision for high performance and modern encryption.
"address": "0.0.0.0",
"port": 443,
"protocol": "vless",
"tag": "proxy-direct",
"sniffing": {
"enabled": true,
"destOverride": ["http", "tls", "quic"],
"routeOnly": true
},
"settings": {
"clients": [
// SERVER B: Two connections - one for reverse tunnel, one for direct proxy.
{
"email": "b-reverse",
"id": "REPLACE_WITH_UUID_B_REVERSE",
"reverse": { "tag": "reverse-b" }
},
{
"email": "b-direct",
"id": "REPLACE_WITH_UUID_B_DIRECT"
},
// SERVER C: Similar setup to B.
{
"email": "c-reverse",
"id": "REPLACE_WITH_UUID_C_REVERSE",
"reverse": { "tag": "reverse-c" }
},
{
"email": "c-direct",
"id": "REPLACE_WITH_UUID_C_DIRECT"
}
],
"flow": "xtls-rprx-vision",
"decryption": "none",
"fallbacks": [
{
// CAMOUFLAGE: If an unauthorized user hits 443, forward them to Nginx.
// This hides the fact that an Xray instance is running.
"dest": "10.1.1.4:8080"
}
]
},
"streamSettings": {
"network": "tcp",
"security": "tls",
"tlsSettings": {
"alpn": ["h2", "http/1.1"],
"certificates": [
{
// Path to SSL certificates (mapped via Docker volumes).
"certificateFile": "/etc/letsencrypt/live/A-DOMAIN/fullchain.pem",
"keyFile": "/etc/letsencrypt/live/A-DOMAIN/privkey.pem"
}
]
}
}
},
{
// TPROXY INBOUND (Host Interception)
// This inbound "catches" traffic from the host's kernel that was
// marked by IPTables (before.rules).
"tag": "proxy-enclave",
"listen": "127.0.0.1",
"port": 12345,
"protocol": "tunnel",
"settings": {
"network": "tcp,udp",
"followRedirect": true
},
"sniffing": {
"enabled": true,
"destOverride": ["http", "tls", "quic"],
"routeOnly": true
},
"streamSettings": {
"sockopt": {
"tproxy": "tproxy",
"mark": 255 // Mark 255 prevents Xray from intercepting its own output.
}
}
}
],
"outbounds": [
{
// FREEDOM OUTBOUND: Standard direct connection to the internet.
"tag": "forward-direct",
"protocol": "freedom",
"settings": {
"domainStrategy": "UseIP"
},
"streamSettings": {
"sockopt": {
"mark": 255
}
}
},
{
// DNS OUTBOUND: Ensures all DNS traffic is sent to the local AdGuard resolver.
"tag": "forward-dns",
"protocol": "dns",
"settings": {
"address": "10.1.1.3",
"port": 53,
"nonIPQuery": "skip"
}
}
],
"routing": {
"domainStrategy": "IPIfNonMatch",
"rules": [
{
// Enforce centralized DNS for all queries.
"port": "53",
"network": "udp,tcp",
"outboundTag": "forward-dns"
},
{
// Internal subnet 10.1.x.x traffic is handled directly on this node.
"inboundTag": ["proxy-direct"],
"ip": ["10.1.0.0/16"],
"outboundTag": "forward-direct"
},
{
// TRAFFIC TO SPOKE B (10.2.x.x):
// If traffic is destined for Server B's range, send it through
// the reverse tunnel initiated by Server B.
"inboundTag": ["proxy-enclave"],
"ip": ["10.2.0.0/16"],
"outboundTag": "reverse-b"
},
{
// TRAFFIC TO SPOKE C (10.3.x.x):
// Similar to above, send through Server C's reverse tunnel.
"inboundTag": ["proxy-enclave"],
"ip": ["10.3.0.0/16"],
"outboundTag": "reverse-c"
}
]
}
}
b/before.rules
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# /etc/ufw/before.rules for Server B (10.2.0.0/16)
#
# These rules handle the transparent interception of 10.0.0.0/8 traffic
# destined for other nodes (e.g., 10.1.x.x or 10.3.x.x).
COMMIT
*mangle
:XRAY - [0:0]
:XRAY_MASK - [0:0]
:DIVERT - [0:0]
# Intercept Prerouting traffic (e.g. from local containers)
-A XRAY -d 10.2.0.0/16 -j RETURN
-A XRAY ! -d 10.0.0.0/8 -j RETURN
-A XRAY -m mark --mark 0xff -j RETURN
-A XRAY -p udp -j TPROXY --on-ip 127.0.0.1 --on-port 12345 --tproxy-mark 1
-A XRAY -p tcp -j TPROXY --on-ip 127.0.0.1 --on-port 12345 --tproxy-mark 1
-A PREROUTING -j XRAY
# Intercept Output traffic (originating from the server itself)
-A XRAY_MASK -d 10.2.0.0/16 -j RETURN
-A XRAY_MASK ! -d 10.0.0.0/8 -j RETURN
-A XRAY_MASK -m mark --mark 0xff -j RETURN
-A XRAY_MASK -p udp -j MARK --set-mark 1
-A XRAY_MASK -p tcp -j MARK --set-mark 1
-A OUTPUT -j XRAY_MASK
-A DIVERT -j MARK --set-mark 1
-A DIVERT -j ACCEPT
-I PREROUTING -p tcp -m socket -j DIVERT
COMMIT
*filter
# Allow internal traffic between our subnet and the mimicry range
-A ufw-before-forward -s 10.2.0.0/16 -d 10.2.0.0/16 -j ACCEPT
-A ufw-before-forward -s 10.2.0.0/16 -d 10.0.0.0/8 -m mark --mark 0x1 -j ACCEPT
-A ufw-before-input -s 10.2.0.0/16 -d 10.2.0.0/16 -j ACCEPT
-A ufw-before-input -s 10.2.0.0/16 -d 10.0.0.0/8 -m mark --mark 0x1 -j ACCEPT
b/docker-compose.yaml
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name: 'b'
services:
xray:
image: ghcr.io/xtls/xray-core:26.1.23
container_name: b-xray
network_mode: host
volumes:
- ./xray.jsonc:/etc/xray/config.jsonc:ro
command: -c '/etc/xray/config.jsonc'
restart: unless-stopped
cap_add:
- NET_ADMIN
- NET_RAW
b/xray.jsonc
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{
// ==========================================
// SERVER B: SPOKE NODE (Subnet: 10.2.0.0/16)
// ==========================================
// This node initiates a reverse tunnel to Server A.
// It allows Server A to reach clients in the 10.2.x.x range.
"log": {
"loglevel": "info"
},
"dns": {
"servers": [
// Queries are forwarded to Server A's central DNS (AdGuard).
"10.1.1.3"
]
},
"inbounds": [
{
// TPROXY INBOUND
// Intercepts traffic for the 10.0.0.0/8 subnet from the local host.
"tag": "proxy-enclave",
"listen": "127.0.0.1",
"port": 12345,
"protocol": "tunnel",
"settings": {
"network": "tcp,udp",
"followRedirect": true
},
"sniffing": {
"enabled": true,
"destOverride": ["http", "tls", "quic"],
"routeOnly": true
},
"streamSettings": {
"sockopt": {
"tproxy": "tproxy",
"mark": 255
}
}
}
],
"outbounds": [
{
// FREEDOM OUTBOUND: Standard breakout for the local internet.
"protocol": "freedom",
"tag": "forward-direct",
"settings": {
"domainStrategy": "UseIP"
},
"streamSettings": {
"sockopt": {
"mark": 255
}
}
},
{
// REVERSE TUNNEL INITIATION
// This outbound initiates the connection to Server A.
// Once established, Server A can send packets BACK through this tunnel.
"protocol": "vless",
"tag": "forward-a-reverse",
"settings": {
"address": "A-EXTERNAL-IP",
"port": 443,
"id": "REPLACE_WITH_UUID_B_REVERSE",
"level": 0,
"encryption": "none",
"flow": "xtls-rprx-vision",
"reverse": {
"tag": "reverse-b"
}
},
"streamSettings": {
"network": "tcp",
"security": "tls",
"tlsSettings": {
"serverName": "A-DOMAIN",
"allowInsecure": false,
"fingerprint": "chrome",
"alpn": ["h2", "http/1.1"]
}
}
},
{
// STANDARD PROXY OUTBOUND
// Used for routing non-local 10.x.x.x traffic through Server A.
"protocol": "vless",
"tag": "forward-a",
"settings": {
"address": "A-EXTERNAL-IP",
"port": 443,
"id": "REPLACE_WITH_UUID_B_DIRECT",
"level": 0,
"encryption": "none",
"flow": "xtls-rprx-vision"
},
"streamSettings": {
"network": "tcp",
"security": "tls",
"tlsSettings": {
"serverName": "A-DOMAIN",
"allowInsecure": false,
"fingerprint": "chrome",
"alpn": ["h2", "http/1.1"]
}
}
}
],
"routing": {
"rules": [
{
// Traffic from local host for other subnets (A or C) goes to Server A.
"inboundTag": [ "proxy-enclave" ],
"outboundTag": "forward-a"
},
{
// Traffic arriving from Server A via the tunnel goes to local subnet breakout.
"inboundTag": [ "reverse-b" ],
"outboundTag": "forward-direct"
},
{
// Ensure local 10.2.x.x traffic does not enter the tunnel loop.
"ip": ["10.2.0.0/16"],
"outboundTag": "forward-direct"
},
{
// Route everything else in 10.0.0.0/8 to Server A for relay.
"ip": ["10.0.0.0/8"],
"outboundTag": "forward-a"
}
]
}
}
c/before.rules
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# /etc/ufw/before.rules for Server C (10.3.0.0/16)
#
# These rules handle the transparent interception of 10.0.0.0/8 traffic
# destined for other nodes (e.g., 10.1.x.x or 10.2.x.x).
COMMIT
*mangle
:XRAY - [0:0]
:XRAY_MASK - [0:0]
:DIVERT - [0:0]
# Intercept Prerouting traffic (e.g. from local containers)
-A XRAY -d 10.3.0.0/16 -j RETURN
-A XRAY ! -d 10.0.0.0/8 -j RETURN
-A XRAY -m mark --mark 0xff -j RETURN
-A XRAY -p udp -j TPROXY --on-ip 127.0.0.1 --on-port 12345 --tproxy-mark 1
-A XRAY -p tcp -j TPROXY --on-ip 127.0.0.1 --on-port 12345 --tproxy-mark 1
-A PREROUTING -j XRAY
# Intercept Output traffic (originating from the server itself)
-A XRAY_MASK -d 10.3.0.0/16 -j RETURN
-A XRAY_MASK ! -d 10.0.0.0/8 -j RETURN
-A XRAY_MASK -m mark --mark 0xff -j RETURN
-A XRAY_MASK -p udp -j MARK --set-mark 1
-A XRAY_MASK -p tcp -j MARK --set-mark 1
-A OUTPUT -j XRAY_MASK
-A DIVERT -j MARK --set-mark 1
-A DIVERT -j ACCEPT
-I PREROUTING -p tcp -m socket -j DIVERT
COMMIT
*filter
# Allow internal traffic between our subnet and the mimicry range
-A ufw-before-forward -s 10.3.0.0/16 -d 10.3.0.0/16 -j ACCEPT
-A ufw-before-forward -s 10.3.0.0/16 -d 10.0.0.0/8 -m mark --mark 0x1 -j ACCEPT
-A ufw-before-input -s 10.3.0.0/16 -d 10.3.0.0/16 -j ACCEPT
-A ufw-before-input -s 10.3.0.0/16 -d 10.0.0.0/8 -m mark --mark 0x1 -j ACCEPT
c/docker-compose.yaml
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name: 'c'
services:
xray:
image: ghcr.io/xtls/xray-core:26.1.23
container_name: c-xray
network_mode: host
volumes:
- ./xray.jsonc:/etc/xray/config.jsonc:ro
command: -c '/etc/xray/config.jsonc'
restart: unless-stopped
cap_add:
- NET_ADMIN
- NET_RAW
c/xray.jsonc
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{
// ==========================================
// SERVER C: SPOKE NODE (Subnet: 10.3.0.0/16)
// ==========================================
// This node is identical in purpose to Server B,
// but it is the authority for the 10.3.x.x range.
"log": {
"loglevel": "info"
},
"dns": {
"servers": [
// Queries are forwarded to Server A's central DNS.
"10.1.1.3"
]
},
"inbounds": [
{
// TPROXY INBOUND
"tag": "proxy-enclave",
"listen": "127.0.0.1",
"port": 12345,
"protocol": "tunnel",
"settings": {
"network": "tcp,udp",
"followRedirect": true
},
"sniffing": {
"enabled": true,
"destOverride": ["http", "tls", "quic"],
"routeOnly": true
},
"streamSettings": {
"sockopt": {
"tproxy": "tproxy",
"mark": 255
}
}
}
],
"outbounds": [
{
// FREEDOM OUTBOUND
"protocol": "freedom",
"tag": "forward-direct",
"settings": {
"domainStrategy": "UseIP"
},
"streamSettings": {
"sockopt": {
"mark": 255
}
}
},
{
// REVERSE TUNNEL INITIATION (Hubward)
"protocol": "vless",
"tag": "forward-a-reverse",
"settings": {
"address": "A-EXTERNAL-IP",
"port": 443,
"id": "REPLACE_WITH_UUID_C_REVERSE",
"level": 0,
"encryption": "none",
"flow": "xtls-rprx-vision",
"reverse": {
"tag": "reverse-c"
}
},
"streamSettings": {
"network": "tcp",
"security": "tls",
"tlsSettings": {
"serverName": "A-DOMAIN",
"allowInsecure": false,
"fingerprint": "chrome",
"alpn": ["h2", "http/1.1"]
}
}
},
{
// STANDARD PROXY OUTBOUND (Hubward)
"protocol": "vless",
"tag": "forward-a",
"settings": {
"address": "A-EXTERNAL-IP",
"port": 443,
"id": "REPLACE_WITH_UUID_C_DIRECT",
"level": 0,
"encryption": "none",
"flow": "xtls-rprx-vision"
},
"streamSettings": {
"network": "tcp",
"security": "tls",
"tlsSettings": {
"serverName": "A-DOMAIN",
"allowInsecure": false,
"fingerprint": "chrome",
"alpn": ["h2", "http/1.1"]
}
}
}
],
"routing": {
"rules": [
{
"inboundTag": [ "proxy-enclave" ],
"outboundTag": "forward-a"
},
{
"inboundTag": [ "reverse-c" ],
"outboundTag": "forward-direct"
},
{
// Local 10.3.x.x traffic is breakout directly.
"ip": ["10.3.0.0/16"],
"outboundTag": "forward-direct"
},
{
// All other 10.x.x.x traffic is proxied to Server A.
"ip": ["10.0.0.0/8"],
"outboundTag": "forward-a"
}
]
}
}
routing.sh
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#!/usr/bin/env bash
# Xray Subnet Mimicry - Routing Setup Script
# This script configures the Linux kernel and routing tables to allow
# Xray to intercept and route traffic for the 10.0.0.0/8 subnet.
set -euo pipefail
echo "Applying routing configuration..."
# 1. Enable IP Forwarding
# This is required for the server to act as a router/gateway.
sudo sysctl -w net.ipv4.ip_forward=1
# 2. IP Rule for mark 0x1 -> table 100
# Any packet marked with 0x1 (by our iptables/TPROXY rules)
# will be forced to use routing table 100.
if sudo ip rule show | grep -q 'fwmark 0x1 lookup 100'; then
echo "IP rule for mark 0x1 already exists."
else
sudo ip rule add fwmark 0x1 lookup 100 priority 100
echo "IP rule added for mark 0x1."
fi
# 3. Local route in table 100
# In table 100, we route everything to the local loopback.
# This "tricks" the kernel into handing the packet to our TPROXY inbound
# listening on 127.0.0.1:12345.
if sudo ip route show table 100 2>/dev/null | grep -q 'local default dev lo'; then
echo "Local route in table 100 already exists."
else
sudo ip route add local 0.0.0.0/0 dev lo table 100
echo "Local route added to table 100."
fi
echo "Routing configuration applied successfully."
exit 0