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音视频流媒体技术在近些年的发展非常迅速,己经广泛应用于互联网上。但是为了安全性和节省IP地址,目前大量的企业和局域网都采用防火墙/NAT(Network Address Translation)技术连接到因特网。基于目前NAT技术的原理及应用,文中分析并指出了由于NAT技术的特性造成的主机无法主动与处于NAT后方的主机通讯的问题,结合穿越NAT技术的现状,分析了各种穿越技术的优劣点,并提出了一种新的穿越方案,丰富了穿越NAT的方法,提供了关于穿越NAT防火墙技术的参考。
Audio-visual video streaming technology has developed very rapidly in recent years and has been widely used on the Internet. However, for the sake of security and IP address saving, a large number of enterprises and local area networks now use the Network / Translation (NAT) technology to connect to the Internet. Based on the principle and application of current NAT technology, the paper analyzes and points out the problem that the host can not actively communicate with the host behind the NAT due to the NAT technology. By analyzing the status quo of NAT technology, the advantages and disadvantages of various traversal techniques Point and proposes a new traversal scheme that enriches the method of traversing NAT and provides a reference for traversing NAT firewall technology.