大型网吧局域的组建.doc

摘 要 众所周知，网吧凭借其舒适宽松的上网环境和高速便捷的上网服务，吸引了越来越多网民的光顾。网吧这种经营模式早已被人民大众所接受，各大城市的网吧得到了迅猛的发展，从最初的几台，到现在几十台，甚至上百台计算机的规模。大大小小的网吧已遍及全国，从大中城市到小县城。但随着网吧数量的增多，行业之间的竞争也越来越激烈，为了在激烈的竞争中立足，网吧的成本控制、运行性能、管理维护都成为极其重要的因素。因此，设计并实现一个性价比较高，方便管理的网吧网络方案显得尤为重要。网吧的需求分析、布线系统、设备选择、安全都要考虑在内。 运用的主要技术有：DHCP、NAT重载、VLAN划分、VPN隧道防火墙等，但实验在Packet Trace仿真器上做，顾及到局域网的安全性，同时在路由器R1上用exec-timeout 10 30命令。最后不同VLAN之间能互通；DHCP能自动分配地址；内网能访问外网的信息，但外网不能访问内网信息。 关键字 DHCP/NAT重载技术/VLAN划分/VPN隧道防火墙/综合布线 Large Internet Local Area Network ABSTRACT As we all know, the Internet, with its relaxed and comfortable environment and high-speed Internet access and convenient services to attract more and more users to patronize. This cafe business model has already been accepted by the masses, Internet cafes in major cities has been rapid development, from the initial few, and now dozens, or even hundreds of computers scale. Large and small cafes all over the country, from big cities to small town. But with the increase in the number of Internet cafes, the competition has become increasingly fierce between the industry, in order to gain a foothold in the fierce competition, cafes cost control, operational performance, management and maintenance have become an extremely important factor. Therefore, the design and implementation of a higher cost, easy management of Internet cafes network solutions is particularly important. Internet cafes needs analysis, wiring systems, equipment selection, safety should be taken into account. The main use of technology: DHCP, NAT overloading, VLAN division, VPN tunnels firewall, but the experiment in the Packet Trace Emulator do, having regard to the LAN security while on the router R1 with exec-timeout 10 30 command. Finally able to communicate between different VLAN; DHCP can automatically assign addresses; within the network can access information outside the network, but the network can not be accessed outside the network information. Keyword DHCP / NAT overloading Technical / VLAN div