UDP

UDP is the internet's bare-bones transport protocol: connectionless, unacknowledged, and refreshingly simple. It trades TCP's reliability guarantees for minimal overhead, which suits real-time applications that would rather drop a frame than wait for a retransmit.

What Defines UDP

• No handshake: Packets are sent the moment an application produces them.
• Minimal delay: Without setup or teardown, round trips stay short.
• Unreliable by default: The protocol does not retransmit or reorder data.
• One-to-many: Broadcast and multicast delivery are supported natively.
• Tiny header: At just 8 bytes, nearly all bandwidth carries payload.

UDP Proxying in FlClash

Many proxies only forward TCP, leaving UDP-based apps broken. FlClash enables UDP forwarding so games, calls, and DNS continue to work through the tunnel. Enable it per node:

• udp: true: Enable UDP support in the configuration
• mode: udp: Set proxy mode to handle UDP traffic