Unverified50% confidenceTradeoffExact time
在对称型NAT或严格防火墙环境下，STUN协议可能无法建立直连，需依赖TURN服务器中转，此时文件数据不再是纯粹的P2P传输
1
Sources
50%
Confidence
Long-term
Relevance
7/19/2026
First Seen
Sources
Related Claims
UnverifiedP2P VPNs typically address NAT traversal issues through UDP hole punching and STUN/TURN protocols.75% similarUnverifiedSTUN servers help devices discover their public IP addresses and mapped ports, and are suitable for cone NAT scenarios, but symmetric NAT causes STUN direct connection to fail.71% similarUnverifiedP2P VPN 优先让设备之间建立直接连接，只有在无法直连时才回退到中继模式68% similar
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