* fix(quic): bind proxy packet checksum to packet number via ETQ1 version QUIC proxy connections die with quinn PROTOCOL_VIOLATION "unsent packet acked" under bursty traffic with reordering, and the affected peer pair keeps failing for every new connection until the source node restarts. Root cause: the custom crypto checksums the packet bytes but not the packet number, while quinn decodes truncated packet numbers by proximity to the largest received (RFC 9000 Appendix A). A 1-byte encoded packet delayed beyond the +/-128 decode window is decoded as a future packet number, still passes the checksum, gets ACKed, and the peer aborts because it never sent that number. Real QUIC survives this because the AEAD nonce is derived from the packet number, so a misdecode fails authentication. Fix: negotiate a custom QUIC version ETQ1 (0x45545131) for the proxy. Connections on ETQ1 mix the packet number into the SeaHash checksum, so an out-of-window misdecode fails authentication and the packet is handled as ordinary loss. The mode is derived statelessly from the negotiated version in QuicSession and ServerConfig::initial_keys. Compatibility: the proxy endpoint accepts both ETQ1 and version 1. NatDstQuicConnector dials ETQ1 first; on ConnectionError::VersionMismatch from a legacy peer it retries with version 1 and remembers the peer in legacy_version_peers to skip the rejected version afterwards. The quic:// tunnel keeps version 1 only. Verified with 13 docker nodes under netem jitter and bursty iperf load: the previously-poisoned pair survived 16 minutes on ETQ1 with zero violations while all legacy-version pairs kept dying; mixed new-to-old and old-to-new connections work. * fix(quic): extend the ETQ1 checksum fix to the quic:// tunnel The quic:// tunnel shares CryptoKey with the proxy, so after the proxy moved to ETQ1 the tunnel still carried the unsent-packet-acked exposure. Make endpoint_config() dual-version so tunnel listeners accept both ETQ1 and legacy peers, and dial ETQ1 first in upgrade_connected with a transparent fallback to version 1 on VersionMismatch, via a shared connect_with_etq1 helper. The proxy keeps its hedged dialer with the per-peer legacy memory; tunnel connections are established once per session, so the fallback there costs a single extra round trip.
EasyTier
✨ A simple, secure, decentralized virtual private network solution powered by Rust and Tokio
📚 Full Documentation | 🖥️ Web Console | 📝 Download Releases | 🧩 Third Party Tools | ❤️ Sponsor
Features
Core Features
- 🔒 Decentralized: Nodes are equal and independent, no centralized services required
- 🚀 Easy to Use: Multiple operation methods via web, client, and command line
- 🌍 Cross-Platform: Supports Win/MacOS/Linux/FreeBSD/Android and X86/ARM/MIPS architectures
- 🔐 Secure: AES-GCM or WireGuard encryption, prevents man-in-the-middle attacks
Advanced Capabilities
- 🔌 Efficient NAT Traversal: Supports UDP and IPv6 traversal, works with NAT4-NAT4 networks
- 🌐 Subnet Proxy: Nodes can share subnets for other nodes to access
- 🔄 Intelligent Routing: Latency priority and automatic route selection for best network experience
- ⚡ High Performance: Zero-copy throughout the entire link, supports TCP/UDP/WSS/WG protocols
Network Optimization
- 📊 UDP Loss Resistance: KCP/QUIC proxy optimizes latency and bandwidth in high packet loss environments
- 🔧 Web Management: Easy configuration and monitoring through web interface
- 🛠️ Zero Config: Simple deployment with statically linked executables
Quick Start
📥 Installation
Choose the installation method that best suits your needs:
Linux (Recommended):
curl -fsSL "https://github.com/EasyTier/EasyTier/blob/main/script/install.sh?raw=true" | sudo bash -s install
Homebrew (MacOS/Linux):
brew tap brewforge/chinese
brew install --cask easytier-gui
Windows (Recommended, run with administrator privileges):
irm "https://github.com/EasyTier/EasyTier/blob/main/script/install.ps1?raw=true" | iex
Install via cargo (Latest development version):
cargo install --git https://github.com/EasyTier/EasyTier.git easytier
Install pre-built binary (Recommended, All platforms supported)
Additional steps:
One-Click Register Service (Automatically start when the system boots and run in the background)
🚀 Basic Usage
Quick Networking with Shared Nodes
EasyTier supports quick networking using shared public nodes. When you don't have a public IP, you can use the free shared nodes provided by the EasyTier community. Nodes will automatically attempt NAT traversal and establish P2P connections. When P2P fails, data will be relayed through shared nodes.
When using shared nodes, each node entering the network needs to provide the same --network-name and --network-secret parameters as the unique identifier of the network.
Taking two nodes as an example (Please use more complex network name to avoid conflicts):
- Run on Node A:
# Run with administrator privileges
sudo easytier-core -d --network-name abc --network-secret abc -p tcp://<SharedNodeIP>:11010
- Run on Node B:
# Run with administrator privileges
sudo easytier-core -d --network-name abc --network-secret abc -p tcp://<SharedNodeIP>:11010
After successful execution, you can check the network status using easytier-cli:
| ipv4 | hostname | cost | lat_ms | loss_rate | rx_bytes | tx_bytes | tunnel_proto | nat_type | id | version |
| ------------ | -------------- | ----- | ------ | --------- | -------- | -------- | ------------ | -------- | ---------- | --------------- |
| 10.126.126.1 | abc-1 | Local | * | * | * | * | udp | FullCone | 439804259 | 2.6.2-70e69a38~ |
| 10.126.126.2 | abc-2 | p2p | 3.452 | 0 | 17.33 kB | 20.42 kB | udp | FullCone | 390879727 | 2.6.2-70e69a38~ |
| | PublicServer_a | p2p | 27.796 | 0.000 | 50.01 kB | 67.46 kB | tcp | Unknown | 3771642457 | 2.6.2-70e69a38~ |
You can test connectivity between nodes:
# Test connectivity
ping 10.126.126.1
ping 10.126.126.2
Note: If you cannot ping through, it may be that the firewall is blocking incoming traffic. Please turn off the firewall or add allow rules.
To improve availability, you can connect to multiple shared nodes simultaneously:
# Connect to multiple shared nodes
sudo easytier-core -d --network-name abc --network-secret abc -p tcp://<SharedNodeIP1>:11010 -p udp://<SharedNodeIP2>:11010
Once your network is set up successfully, you can easily configure it to start automatically on system boot. Refer to the One-Click Register Service guide for step-by-step instructions on registering EasyTier as a system service.
Decentralized Networking
EasyTier is fundamentally decentralized, with no distinction between server and client. As long as one device can communicate with any node in the virtual network, it can join the virtual network. Here's how to set up a decentralized network:
- Start First Node (Node A):
# Start the first node
sudo easytier-core -i 10.144.144.1
After startup, this node will listen on the following ports by default:
- TCP: 11010
- UDP: 11010
- WebSocket: 11011
- WebSocket SSL: 11012
- WireGuard: 11013
- Connect Second Node (Node B):
# Connect to the first node using its public IP
sudo easytier-core -i 10.144.144.2 -p udp://FIRST_NODE_PUBLIC_IP:11010
- Verify Connection:
# Test connectivity
ping 10.144.144.2
# View connected peers
easytier-cli peer
# View routing information
easytier-cli route
# View local node information
easytier-cli node
For more nodes to join the network, they can connect to any existing node in the network using the -p parameter:
# Connect to any existing node using its public IP
sudo easytier-core -i 10.144.144.3 -p udp://ANY_EXISTING_NODE_PUBLIC_IP:11010
🔍 Advanced Features
Subnet Proxy
Assuming the network topology is as follows, Node B wants to share its accessible subnet 10.1.1.0/24 with other nodes:
flowchart LR
subgraph Node A Public IP 22.1.1.1
nodea[EasyTier<br/>10.144.144.1]
end
subgraph Node B
nodeb[EasyTier<br/>10.144.144.2]
end
id1[[10.1.1.0/24]]
nodea <--> nodeb <-.-> id1
To share a subnet, add the -n parameter when starting EasyTier:
# Share subnet 10.1.1.0/24 with other nodes
sudo easytier-core -i 10.144.144.2 -n 10.1.1.0/24
Subnet proxy information will automatically sync to each node in the virtual network, and each node will automatically configure the corresponding route. You can verify the subnet proxy setup:
- Check if the routing information has been synchronized (the proxy_cidrs column shows the proxied subnets):
# View routing information
easytier-cli route
- Test if you can access nodes in the proxied subnet:
# Test connectivity to proxied subnet
ping 10.1.1.2
WireGuard Integration
EasyTier can act as a WireGuard server, allowing any device with a WireGuard client (including iOS and Android) to access the EasyTier network. Here's an example setup:
flowchart LR
ios[[iPhone<br/>WireGuard Installed]]
subgraph Node A Public IP 22.1.1.1
nodea[EasyTier<br/>10.144.144.1]
end
subgraph Node B
nodeb[EasyTier<br/>10.144.144.2]
end
id1[[10.1.1.0/24]]
ios <-.-> nodea <--> nodeb <-.-> id1
- Start EasyTier with WireGuard portal enabled:
# Register one WireGuard client as virtual peer 10.144.144.3
sudo easytier-core -i 10.144.144.1 \
--network-secret portal-secret \
--vpn-portal wg://0.0.0.0:11013 \
--vpn-portal-private-key "$(wg genkey)" \
--vpn-portal-client phone=10.144.144.3
- Get WireGuard client configuration:
# Get WireGuard client configuration
easytier-cli vpn-portal
- In the output configuration, replace a wildcard
Peer.Endpointwith the public IP/domain of your EasyTier node, then import it.Interface.Addressis local to that WireGuard client and may be changed to any IPv4 address; EasyTier translates it to the registered virtual-peer address.
Self-Hosted Public Shared Node
You can run your own public shared node to help other nodes discover each other. A public shared node is just a regular EasyTier network (with same network name and secret) that other networks can connect to.
To run a public shared node:
# No need to specify IPv4 address for public shared nodes
sudo easytier-core --network-name mysharednode --network-secret mysharednode
Related Projects
- ZeroTier: A global virtual network for connecting devices.
- TailScale: A VPN solution aimed at simplifying network configuration.
Contact Us
- 💬 Telegram Group
- 👥 [QQ Group]
License
EasyTier is released under the LGPL-3.0.
Responsible Use
Use EasyTier only for lawful purposes and in compliance with applicable laws and regulations. You are responsible for ensuring that you are authorized to connect to and administer the networks and devices involved.
Sponsor
CDN acceleration and security protection for this project are sponsored by Tencent EdgeOne.
Special thanks to Langlang Cloud and RainCloud for sponsoring our public servers.
If you find EasyTier helpful, please consider sponsoring us. Software development and maintenance require a lot of time and effort, and your sponsorship will help us better maintain and improve EasyTier.




