⚡ Byp

The Ultra-Lightweight V2Ray & Xray Windows Client with Kernel-Level Split Tunneling & Gaming Performance Mode.

Route Discord, Telegram, or any specific app through your encrypted proxy while keeping your games and entire PC on raw, low-ping direct ISP internet — visually, with zero manual routing headaches.

⚡ Quick Install • 📖 Overview • ✨ Key Features • 🛠️ Architecture • 📊 Comparison • ❓ FAQ

🌐 English | 🇮🇷 نسخه فارسی (Persian)

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⚡ Quick Download & Installation

Get started with Byp in seconds — no complex installers, no background CLI bloat.

Option 1: Direct Download (Recommended)

1. Download the latest release from the Releases page:
   • 📦 Download Latest byp.exe / .zip
2. Extract and run byp.exe as Administrator (required by Windows to create the Layer-3 Wintun virtual network adapter and manage process-level packet routes).
3. Import your configuration (vless://, vmess://, trojan://, ss:// or Subscription link) and enjoy smooth gaming!

Tip

Windows SmartScreen Note: As Byp is an independent project without an expensive corporate certificate, Windows Defender SmartScreen might show a prompt on initial launch. Click "More info" ➔ "Run anyway" to launch.

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Option 2: Building from Source

Prerequisites: Go 1.25+, Node.js 22+, and Wails v3 CLI.

# Clone the repository
git clone https://github.com/devlsam/Byp.git
cd Byp

# Install dependencies and build
go mod tidy
wails3 build -clean -s

The compiled native executable will be ready at build/bin/byp.exe.

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📖 Overview: Why Byp?

_{⚡ Interactive Visual Flow: Wire apps directly to VPN Tunnel or Direct Internet on the fly with zero connection drop.}

❌ The Core Problem with Existing V2Ray / Xray Clients

For millions of gamers, developers, and everyday users, existing Windows V2Ray clients (v2rayN, NekoBox, etc.) force a frustrating compromise:

1. System Proxy Fails for Gaming & Voice: Apps like Discord (WebRTC & UDP Voice) and multiplayer games completely ignore Windows system proxy settings.
2. Global TUN Destroys Game Ping: Turning on full TUN mode forces 100% of your PC's network traffic through the proxy. Your gaming ping spikes from 40ms to 200ms+, packet loss climbs, direct file downloads are throttled, and domestic websites/banking lock you out.
3. Manual Routing Rules are an Exhausting Nightmare: Setting up process routing in traditional clients requires writing tedious regex rules, digging through nested JSON files, hunting down ephemeral UDP ports, or maintaining fragile .exe path whitelists that break every time an app auto-updates.

✅ The Byp Solution: Kernel-Level Split Tunneling

Byp was built from the ground up to solve this exact problem:

• Separates Traffic at the Kernel Boundary: Before network packets can congest or re-route through user-space proxies, Byp inspects and attributes socket ownership at the Windows kernel level.
• Game at 100% Native Ping While Discord Stays on VPN: Keep Discord.exe (including voice chat) crystal-clear on your encrypted proxy, while your games (Valorant, CS2, Dota 2, Call of Duty, Steam) bypass the VPN entirely and run at direct physical ISP wire speeds.
• Full Freedom of Veteran Clients: No features stripped down. You get full support for every modern Xray protocol, subscription management, and complete freedom to inspect and edit raw JSON configs just like you're used to.

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✨ Key Features

🎨 1. Modern, Sleek & Fluid UI

Ditch the cluttered, confusing interfaces from a decade ago. Byp features an ultra-responsive, dark matte aesthetic designed for speed and clarity. Smooth micro-interactions, clean visual feedback, and a frictionless experience make configuring proxies effortless.

⚡ 2. Kernel-Level Visual Split Tunneling

• Visual Node Topology: Inspired by modern flow-builders like n8n, simply wire applications between VPN Tunnel and Direct Internet.
• 1-Click Presets: Instantly route popular apps with built-in pills for Discord.exe, Telegram.exe, Chrome.exe, Steam.exe, and more.
• Live Process Scanner (+ Running Apps): Scan active Windows processes directly from RAM, or browse for any .exe file on your system.
• Update-Resilient Engine: Routes based on the base executable name across child processes, so auto-updating apps (like Discord updating to app-1.0.9xxx) never lose their routing rules.
• Zero-Restart Switching: Flip an app's route instantly without dropping your active core connection.

🌐 3. Full Xray Protocol Fleet & Unrestricted JSON Editing

Supports every protocol, transport, and encryption scheme provided by Xray-core:

• Protocols: VLESS (XTLS-Reality, XTLS-Vision), VMess, Trojan, Shadowsocks, WireGuard.
• Transports: TCP, WebSocket (WS), gRPC, HTTPUpgrade, SplitHTTP.
• Subscriptions: Automated Base64 subscription import and periodic updates.
• Raw JSON Freedom: Just like famous power-user clients, you have 100% open access to view, customize, and edit the underlying Xray JSON configurations. Your configs, your rules.

🛡️ 4. Custom DNS Routing & Anti-Poisoning Guard

• Flexible DNS Routing: Route DNS queries through custom upstream resolvers (Cloudflare, Google, custom DoH/DoT) or direct local gateways.
• Eliminate Voice & WebRTC Errors: Transparent DNS interception prevents ISP DNS poisoning, permanently eliminating Discord RTC Connecting and No Route voice glitches.

🔄 5. Direct GitHub Auto-Updater

Never worry about manually hunting for new releases. Byp includes an integrated background auto-updater hooked directly to the devlsam/Byp repository. When a new update drops, download and restart right from the app with one click.

🚀 6. Auto-Connect on Launch & Boot Autostart

• Seamless Startup: Enable auto-connect so Byp immediately engages your active proxy and split-tunneling rules the moment the application opens or when Windows boots.
• Zero-Friction Gaming: Boot your PC, start your favorite game, and have Discord already routed through the proxy in the background without clicking a single button.

🎮 7. Gaming Performance Mode (~40MB RAM Footprint)

• Engineered to be the Lightest Client Possible: Built with native Go and Wails v3, utilizing the built-in Windows Edge WebView2 engine instead of dragging along a 300MB+ Chromium/Electron environment.
• Single In-Memory Executable: Both xray-core and tun2socks run natively in memory inside byp.exe. No annoying popup CLI windows, no orphan background processes, and negligible CPU impact during intense gaming sessions.

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🛠️ Kernel-Level Architecture

Traditional user-space proxy wrappers fail with games and WebRTC because applications spin up hundreds of transient TCP and UDP sockets every minute. Byp delivers line-rate performance with zero per-packet CPU overhead:

flowchart LR
    subgraph "Windows Process Layer"
        SYS["🖥️ My System (Default OS)"]
        DISC["🎧 Discord.exe (TCP + UDP Voice)"]
        GAME["🎮 Game.exe (CS2 / Valorant / Dota)"]
    end

    subgraph "Byp In-Memory Engine"
        TUN["🛡️ Wintun + tun2socks\n(Exact Source-Port PID Matcher)"]
    end

    subgraph "Network Gateways"
        VPN["⚡ VPN Tunnel\n(Embedded Xray-core)"]
        ISP["🌐 Direct Internet\n(Physical NIC via IP_UNICAST_IF)"]
    end

    SYS -.->|Default Route| ISP
    DISC ==>|Tunnel Wire| TUN
    GAME -.->|Direct Wire| ISP
    TUN ==>|Encrypted Wire| VPN

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1. Exact Source-Port Attribution (iphlpapi.dll): Packets entering the Layer-3 Wintun adapter have their original source ports inspected in the gVisor netstack before NAT translation. Byp queries Windows kernel socket tables (GetExtendedTcpTable & GetExtendedUdpTable) to pinpoint the owning PID in nanoseconds.
2. Lock-Free Memory Cache: Process image paths are mapped once during initial handshake via QueryFullProcessImageNameW and cached in a thread-safe sync.Map. All subsequent data packets flow at native wire speed.
3. Hardware Layer-3 NIC Binding (IP_UNICAST_IF): Packets designated for direct internet are locked to your physical network interface's InterfaceIndex at socket creation via setsockopt(..., IP_UNICAST_IF), completely eliminating routing loops back into the TUN adapter.
4. Crash-Safe Self-Healing: Shutdown hooks instantly purge static routes, release the Wintun interface, and reset Windows system proxies upon exit. Your internet will never get stuck.

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📊 Comparison

Feature	⚡ Byp	v2rayN	NekoRay / NekoBox	Proxifier + Xray
Per-App Split Tunneling	Interactive Visual Canvas	Nested text menus	Complex routing rules	External paid tool
Discord Voice (UDP) Split	✅ 1-Click Preset	⚠️ Complex TUN config	⚠️ Manual process rules	⚠️ Manual port mapping
Game Ping Protection	✅ Kernel NIC Binding	⚠️ Route table conflicts	⚠️ Packet latency overhead	❌ Not a tunnel client
RAM Footprint (Idle)	~35 MB – 50 MB	~90 MB – 140 MB	~110 MB – 160 MB	~120 MB+
Core Architecture	In-Memory Go Binary	Spawns external CLI .exe	Spawns external core .exe	Requires 2 separate apps
App Update Tolerance	✅ Matches Base Executable	⚠️ Breaks on folder change	⚠️ Breaks on folder change	✅ Supported
Auto-Connect on Launch	✅ Native Setting	⚠️ Varies	⚠️ Manual	❌ N/A
Built-in Auto Updater	✅ Direct from GitHub	⚠️ Manual / Semi-auto	⚠️ Manual download	⚠️ Separate updater
Raw JSON Config Freedom	✅ Full Freedom	✅ Supported	⚠️ Limited in UI	❌ N/A

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🗺️ Roadmap

• In-memory xray-core + tun2socks (Wintun) single-binary architecture
• Interactive node-based split tunneling for .exe applications
• 1-Click quick presets (Discord, Telegram, Steam, Chrome) & live process scanner
• Layer-3 physical NIC binding (IP_UNICAST_IF) for loop-free bypass
• Auto-Connect on Launch & Windows autostart
• Native GitHub Releases auto-updater
• Domain & GeoIP routing blocks inside visual topology
• Live per-application bandwidth and latency gauges on routing wires
• Profile presets (Switch between "Gaming Mode", "Work Mode", and "Full VPN")

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❓ FAQ

Why is Byp the best V2Ray / Xray client for gaming on Windows?

Because traditional clients route either your entire PC or rely on basic system proxies that ignore games and Discord UDP voice. Byp separates traffic at the kernel level using Wintun: Discord Voice stays encrypted and connected on your proxy, while games bypass the tunnel with 0ms added ping.

How does Discord Voice work without "RTC Connecting" or "No Route" errors?

Discord voice transmits over WebRTC via dynamic UDP ports. Byp's kernel attribution resolves Discord's UDP sockets instantly and tunnels them through Layer-3 TUN directly into the core, eliminating voice connection drops for good.

Does Byp require Administrator privileges?

Yes. Initializing the Wintun Layer-3 virtual network adapter and binding network sockets directly to physical NICs require standard Windows Administrator privileges.

Do auto-updates for Discord or Telegram break my routing rules?

No. Byp evaluates rules against the base process name (e.g. Discord.exe) across all child processes, regardless of whether Discord updates into a new directory like app-1.0.9042.

Can I edit raw Xray JSON configs like in v2rayN?

Yes! You have full access to inspect, modify, and tweak outbounds, inbounds, and routing JSON definitions directly.

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🤝 Community & Support

• GitHub Repository: devlsam/Byp
• Bug Reports & Feature Requests: GitHub Issues
• Discord: amosami

If Byp solved your gaming ping and split tunneling headaches, please consider giving this repo a ⭐ Star to support ongoing development!

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📄 License

Distributed under the Business Source License 1.1 (BUSL-1.1).