基于GPRS无线网络和IP协议的数据传输系统 通信模块C51单片机程序-GPRS

通俗易懂，容易上手，对于初学者和深入学习网络技术的人都有很大的帮助

TCP/IP协议的安全隐患和IPSEC协议的研究，内容很全

TCP/IP协议主要存在的安全漏洞 链路层存在的安全漏洞 在以太网中，信道是共享的，任何主机发送的每一个以太网帧都会到达别的与该主机处于同一网段的所有主机的以太网接口，而每一个接口都有一个唯一的MAC地址。信息以数据包的形式传送，其报头包含了目的主机的MAC地址，如果其携带的MAC地址是自己的或者是广播地址，那么就会将数据帧交给IP层，否则丢掉。但是如果我们对其稍做设置或修改，就可以使一个以太网接口接收不属于它的数据帧。 处理方法： （1）对网络中传输的数据进行加密，使攻击方无法正确还原窃取的数据； （2）安装检测软件； （3）改变交换式的网络拓扑结构。

针对ZigBee无线传感器网络的远程监控技术的实现，设计一个将ZigBee协议与TCP/IP协议有机融合在一起的无线网关。系统运行时，互联网中的远程服务器可通过网关对ZigBee无线传感器网络所有节点进行监控。此网关设计方案成本低廉且易于实现，可以为无线传感器网络在诸多领域的应用开发提供设计参考。

注意：本系统只能在Linux系统下使用，如有bug请报送iluckforyou@126.com或交流

INTRODUCTION lwIP is a small independent implementation of the TCP/IP protocol suite. The focus of the lwIP TCP/IP implementation is to reduce the RAM usage while still having a full scale TCP. This making lwIP suitable for use in embedded systems with tens of kilobytes of free RAM and room for around 40 kilobytes of code ROM. lwIP was originally developed by Adam Dunkels at the Computer and Networks Architectures (CNA) lab at the Swedish Institute of Computer Science (SICS) and is now developed and maintained by a worldwide network of developers. FEATURES * IP (Internet Protocol, IPv4 and IPv6) including packet forwarding over multiple network interfaces * ICMP (Internet Control Message Protocol) for network maintenance and debugging * IGMP (Internet Group Management Protocol) for multicast traffic management * MLD (Multicast listener discovery for IPv6). Aims to be compliant with RFC 2710. No support for MLDv2 * ND (Neighbor discovery and stateless address autoconfiguration for IPv6). Aims to be compliant with RFC 4861 (Neighbor discovery) and RFC 4862 (Address autoconfiguration) * DHCP, AutoIP/APIPA (Zeroconf), ACD (Address Conflict Detection) and (stateless) DHCPv6 * UDP (User Datagram Protocol) including experimental UDP-lite extensions * TCP (Transmission Control Protocol) with congestion control, RTT estimation fast recovery/fast retransmit and sending SACKs * raw/native API for enhanced performance * Optional Berkeley-like socket API * TLS: optional layered TCP ("altcp") for nearly transparent TLS for any TCP-based protocol (ported to mbedTLS) (see changelog for more info) * PPPoS and PPPoE (Point-to-point protocol over Serial/Ethernet) * DNS (Domain name resolver incl. mDNS) * 6LoWPAN (via IEEE 802.15.4, BLE or ZEP) APPLICATIONS * HTTP server with SSI and CGI (HTTPS via altcp) * SNMPv2c agent with MIB compiler (Simple Network Management Protocol), v3 via altcp * SNTP (Simple network time protocol) * NetBIOS name service responder * MDNS (Multicast DNS) responder * iPerf server implementation * MQTT client (TLS support via altcp) LICENSE lwIP is freely available under a BSD license. DEVELOPMENT lwIP has grown into an excellent TCP/IP stack for embedded devices, and developers using the stack often submit bug fixes, improvements, and additions to the stack to further increase its usefulness. Development of lwIP is hosted on Savannah, a central point for software development, maintenance and distribution. Everyone can help improve lwIP by use of Savannah's interface, Git and the mailing list. A core team of developers will commit changes to the Git source tree. The lwIP TCP/IP stack is maintained in the 'lwip' Git module and contributions (such as platform ports) are in the 'contrib' Git module. See doc/savannah.txt for details on Git server access for users and developers. The current Git trees are web-browsable: http://git.savannah.gnu.org/cgit/lwip.git http://git.savannah.gnu.org/cgit/lwip/lwip-contrib.git Submit patches and bugs via the lwIP project page: http://savannah.nongnu.org/projects/lwip/ Continuous integration builds (GCC, clang): https://travis-ci.org/lwip-tcpip/lwip DOCUMENTATION Self documentation of the source code is regularly extracted from the current Git sources and is available from this web page: http://www.nongnu.org/lwip/ Also, there are mailing lists you can subscribe at http://savannah.nongnu.org/mail/?group=lwip plus searchable archives: http://lists.nongnu.org/archive/html/lwip-users/ http://lists.nongnu.org/archive/html/lwip-devel/ There is a wiki about lwIP at http://lwip.wikia.com/wiki/LwIP_Wiki You might get questions answered there, but unfortunately, it is not as well maintained as it should be. lwIP was originally written by Adam Dunkels: http://dunkels.com/adam/ Reading Adam's papers, the files in docs/, browsing the source code documentation and browsing the mailing list archives is a good way to become familiar with the design of lwIP. Adam Dunkels Leon Woestenberg

基于tcp/ip协议的java聊天软件,实现客户端与客户端之间的通信

中南大学电子信息工程专业14级通信网实验报告：基于TCP_IP协议的网络通信.

该工程实现了服务端和客户端之间的连接建立和实现通信，利用select模型完成了异步IO，实现了客户端和服务端的文件传输。