操作系统和网络技术研究
网络工程师在做日常网络维护的时候可能经常会遇到这种情况：发现某个IP地址流量特别大，或者收发特别异常的时候，想找出该IP对应的用户出来。而在思科交换机搭建的环境中，是能做到通过对方MAC/IP地址来查找对端对应的交换机端口的，具体步骤如下：
假设对端的MAC地址为：192.168.1.101
在中心交换机（核心层交换机或汇聚层交换机）上输入:
switch-6509#show ip arp | in 192.168.1.101
Internet 192.168.50.47 2 0011.2233.4455 ARPA Vlan50
在ARP表中我们找到了和192.168.1.101对应的MAC地址，如果要根据MAC地 Continue reading "思科交换机根据MAC/IP地址查找对应端口"
ap1200# configure terminal
ap1200(config-if)# ssid migrate
ap1200(config-if)# encryption mode cipher tkip wep128
ap1200(config-if)# encryption key 3 size 128 12345678901234567890123456 transm Continue reading "修改思科1240无线网络密码"
1、用console线连接到交换机，通过超级终端或Secure CRT连接到交换机；
2、一直按住交换机前面板上的 MODE键，插上交换机电源；
3、约40秒后放开Mode键；
4、此时会出现如下界面:
swith： flash_init
load_helper
boot
运行flash_init命令，然后输入如下命令：
rename flash:\config.text flash:\config.old //更名含有password的配置文件;
然后输入boot;
5、此时再输入enable，就可以直接进入特权模式（因为此时的配置文件已经没有password了此时再输入:
#rename flash:\config.old flash:\config.text
#copy flash:\config.text system:running-config
6、修改新的口令:
#configure terminal
#enable secret 你的新口令
7、保存配置:wre键；
The new campus network can provide high-speed --1Gpbs (1 Gigabit per second)-- connectivity to the Internet and Rice campus resources. In addition, the new network provides access to the Internet for campus visitors while retaining a secure environment for Rice University students, faculty, and staff members.
To prevent degradation of speed and stability, all computers that attempt to connect to the Rice network must successfully pass through the Clean Access application.
Clean Access does not review any of the data on your personal computer, it only scans your operating system for current patches and checks for the presence of anti-virus software and/or actual viruses hiding in your machine.
If your machine has not been compromised by malicious programs (worms and viruses) and is running the current security patches for your operating system, you will simply accept the Appropriate Use of Computing Resources policy and enter the Rice network.
If your machine has been compromised or is an easy target for hijacking by a malicious agent, you will be prompted to scrub and update your computer before you can enter the Rice network.
Information on connecting to the Rice University Network
Rice University uses Cisco Clean Access to help ensure users on our network receive appropriate access to networking resources and systems connecting to our network have appropriate levels of security enabled and installed.
More information about Rice University's implementation of Cisco Clean Access, follow the following link:http://www.rice.edu/security/clean.html
When you first connect your computer to the network, you need to open up an internet browser and visit an off-campus website (Google, Yahoo, etc.). The Clean Access page will come up after you visit an off-campus website. If you are a Visitor to Rice University simply click the 'Visitor' button.
If you are a Faculty member, Student, or Staff member, follow these instructions to log onto the network (See question #3 on Clean Access FAQ):
TIP: If you receive an error message like this one: "OOB Error:MAC address of 10.16.48.37 not found", try the following steps:
TIP: If you receive error "Invalid username or password", check to ensure your NetID and password are correct. If you are not familiar with your NetID, click this link to access the Rice Account system: https://apply.rice.edu.
TIP: If you are new to Rice, and have not yet setup your NetID, visit this link to begin: https://apply.rice.edu/index.php?module=apply&page=register
When the download box comes up, choose "Save", not run.
If your NetID is accepted and your system has an updated antivirus, you should see the "Successful" dialog box
TIP: If you receive an error message like this one: "OOB Error:MAC address of 10.16.48.37 not found", try the following steps:
TIP: If the agent states you need to install or update an Antivirus product, and you feel you have already done so, please call the Help Desk (x4357).
