Unverified50% confidenceFactExact time
对称型NAT对每个目标地址使用不同端口映射，UDP打洞成功率极低，几乎必须依赖中继
1
Sources
50%
Confidence
Long-term
Relevance
7/13/2026
First Seen
Sources
Lanemu 0.14: An Open-Source Hamachi Alternative for Free, Unlimited P2P Virtual LANs
redditr/opensource7/11/2026
Related Claims
UnverifiedSTUN 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% similarUnverifiedPort forwarding is a static mapping rule established on a NAT router that forwards external port traffic to an intranet host by modifying the destination address of packets (DNAT).69% similarUnverifiedNAT-PMP及其继任者PCP（Port Control Protocol，RFC 6887）试图以轻量化协议替代UPnP并引入基本访问控制机制，但至今尚未普及66% similar
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