v1.0.0

NetSplit v1.0.0 - Per-Application Network Routing for Windows 11

NetSplit is a high-performance Windows 11 network routing utility that binds individual applications, games, and streaming software to specific network adapters (Ethernet, Wi-Fi, USB cellular tethering, or secondary NICs) without modifying executable binaries, injecting DLLs, or altering the global Windows default routing table.

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Key Highlights & Features

1. Kernel-Grade Network Redirection (WFP & Socket Binding)

• Uses Microsoft Windows Filtering Platform (WFP) Application Layer Enforcement (ALE) at the FWPM_LAYER_ALE_CONNECT_REDIRECT_V4 layer.
• Applies kernel-level socket binding via IP_UNICAST_IF to route outbound traffic directly through the specified physical interface.
• Operates with dynamic kernel sessions (FWPM_SESSION_FLAG_DYNAMIC), guaranteeing zero residue and automatic filter teardown if the daemon stops or restarts.

2. Anti-Cheat Safe Architecture

• Zero binary tampering: No DLL injection, no AppInit_DLLs, no CreateRemoteThread, and no Layered Service Providers (LSP).
• Compatible with kernel-level anti-cheat engines including Riot Vanguard, Easy Anti-Cheat, BattlEye, and Valve Anti-Cheat (VAC).

3. Active Foreground Application Prioritization

• Leverages native Win32 and Desktop Window Manager (DWM) cloaking APIs to discover active top-level windows in real time.
• Automatically prioritizes the applications and games you are interacting with at the top of the routing library.

4. Dynamic Adapter Modes & Failover

• Opposite to Default Adapter: Routes selected software (e.g. streaming, downloads) through whichever active network connection is not the primary Windows default gateway.
• Dynamic Merge Failover: Automatically aggregates traffic onto the primary connection if the secondary adapter disconnects, preventing connection drops.
• Kill-Switch Protection: Optional strict isolation mode that blocks application traffic upon adapter disconnect rather than leaking onto the default route.

5. Secure Loopback IPC Daemon

• Privileged operations execute inside an isolated C++ Windows Service running under NT AUTHORITY\SYSTEM.
• Desktop user interface operates under standard user permissions (Medium Integrity Level), communicating over local loopback (127.0.0.1:48192) authenticated via ephemeral 256-bit security tokens.

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Primary Use Cases

1. Multiplayer Gaming While Live Streaming:
   • Route game executables (Valorant, CS2, Apex Legends, Rocket League) over low-jitter wired Ethernet.
   • Route OBS Studio, Streamlabs, and chat bots over secondary Wi-Fi or mobile hotspots to eliminate bufferbloat and latency spikes.
2. High-Speed Downloads Without Work Interruption:
   • Isolate Steam, Epic Games Launcher, or BitTorrent traffic to secondary Wi-Fi connections while keeping Zoom, Teams, and browsers on your primary connection.
3. Corporate VPN Isolation:
   • Keep enterprise tools on the corporate VPN interface while routing Discord, Spotify, and gaming traffic directly over your physical ISP.
4. Multi-ISP Testing:
   • Compare API behavior and CDN routing across two ISPs simultaneously on a single machine.

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Standalone Release Package Contents

The NetSplit-v1.0.0-windows-x64.zip release archive is fully self-contained:

• No Node.js or npm required: Standalone Electron runtime is pre-bundled.
• No Python or build tools required: All JavaScript code is sealed inside runtime/resources/app.asar.
• No custom kernel drivers required: Uses Windows 11 native WFP and IP Helper APIs.
• No external Visual C++ runtime needed: Links directly against core Windows system DLLs.

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Quick Start

1. Download and extract NetSplit-v1.0.0-windows-x64.zip.
2. Run NetSplit.exe.
3. Accept the standard Windows UAC prompt to allow the application to configure kernel routing rules.
4. Assign applications to your desired network adapters from the Applications library.

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Verification & Integrity

• Automated Test Suite: 18/18 Unit and Integration tests passing.
• Architecture: Windows 10 / Windows 11 (64-bit / x64).