ValveSoftware/GameNetworkingSockets

Health v2 · maintenance only

Adoption not part of the score

9865 stars · 742 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

GameNetworkingSockets is a C++ transport layer library for games providing connection-oriented, message-oriented communication over UDP with reliable and unreliable messaging. It includes fragmentation/reassembly, QUIC-inspired encryption, P2P NAT traversal, and bandwidth management across message lanes.

Use cases

• implement reliable UDP networking for a multiplayer game
• add P2P connections with NAT traversal to a game
• encrypt game network traffic with per-packet AES-GCM
• send messages larger than the MTU with automatic fragmentation
• simulate packet latency and loss during network testing
• prioritize bandwidth across multiple message streams in one connection

When to choose

• you need a battle-tested game transport layer with reliable and unreliable messaging over UDP
• you want built-in encryption and P2P NAT traversal without writing your own protocol
• you need fine-grained control over head-of-line blocking and bandwidth sharing across lanes

When to avoid

• you need a high-level game server framework with matchmaking or lobbies
• your project is not in C++ or a language with bindings to it
• you only need simple TCP or WebSocket communication without game-specific reliability features

Facets

library · maturity stable

networking cryptography p2p networking windows cpp cross-platform udp reliable-messaging nat-traversal transport-layer encryption game-networking quic-inspired game-development real-time linux macos ios

Member repositories

For agents

markdown · JSON · MCP: product_card(name="ValveSoftware/GameNetworkingSockets")