本文主要討論關於P2P 通信的一些常見問題和解決方案。主要內容包含：P2P 通信與網絡設備的關係、不同的網絡設備特徵對P2P 產生的影響、網絡地址轉換（NAT ）的類型、NAT 類型的檢測方法、協議防火牆的突破方法、隧道技術、對於不同的NAT 類型採取的穿透方法。-This article focuses on the P2P communication some common problems and solutions. The main content includes: the P2P communication with the network devices, the impact of the different network devices feature of the P2P, the type of network address translation (NAT), the NAT type of detection method, and method for a breakthrough protocol firewall tunneling technologies for different The NAT type taken penetrate.