udp实现可靠传输的代码，开源的这是一个比较早的版本，功能简单，使用方便，内有说明-udp achieve reliable transmission of the code, open source is a relatively early version, features simple, easy to use, there are notes

NS2网络仿真软件下的mac层定时器实现源码-NS2 network simulation software mac layer under the source timers to achieve

ns2定时器包的取消,跨层访问,NS2添加协议-NS2 cross layer,cancel packet,timer user