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Wednesday, October 22, 2008

小心MAC地址丢失也会导致无法上网

http://article.pchome.net/content-727644.html

在一次意外的断电之后,我发现自已的笔记本电脑竟然不能上网了。笔者用的是10Mbps的小区宽带,网线直连接笔记本网卡接口。经过多种途径的检 查,发现网卡硬件没有损坏, ISP提供的线路畅通,系统没有中毒,驱动程序工作正常,但就是无法上网。最后实在没有好的办法,只得重装系统了,重装系统后,发现仍然无法上网。

当我打开Windows优化大师查看网卡的硬件信息时,无意中却发现网卡的MAC地址竟然是00-00-00-00-00-00,而正常的MAC地址应该是6个16进制的数字。

小知识:MAC地址

MAC地址也叫物理地址、硬件地址或链路地址,是由网卡生产厂家烧入网卡的EPROM中的。MAC地址在计算机里是以48位二进制数表示的。 如:00-0F-EA-D5-59-F5。MAC地址就如同我们身份证上的身份证号码,具有全球唯一性。在网络中,发出数据的主机和接收数据的主机是以 MAC地址作为唯一身份标志的,如果MAC地址丢失,则会造成无法上网的故障。

MAC地址有两种保存方式:一种直接烧录在网卡的EPROM中,这种保存方式比较安全;另一种是保存在主板BIOS中,在刷新BIOS的情况下可能 会造成MAC地址丢失。在Windows中,网卡的MAC地址保存在注册表中,注册表中的MAC地址是在Windows安装的时候从网卡中读入的,在实际 使用中是从注册表中读取的,因此修改注册表就可以改变MAC地址。

忽然想起不能上网之前意外断电一次,而且开机画面也改变了,可能是电流冲击造成保存在BIOS中的MAC地址丢失,造成不能接入网络的故障。由于在Windows中,MAC地址是保存在注册表里的,只要在注册表中修改MAC地址,问题就能解决了。

1. 按win键+R,弹出“运行” 对话框,输入“Regedit”并回车,打开注册表编辑器。

2.在 “HKEY_LOCAL_MACHINE\SYSEM\CurrentControlSet\Control\Class\4D36E972- E325-11CE-BFC1-08002BE10318\0000、0001、0002、0003”等主键下,查找DriverDesc内容为与要修改 的网卡描述相吻合的主键,如“Realtek RTL8139/810x Family Fast Ethernet NIC”(此值为设备管理器中网卡的名称)。

3.在上面的主键下添一个名为“NetworkAddress”的字符串,值设为想要修改的MAC地址,如“000FEAD559F5” (不包含引号)。

4.然后在主键下“NDIparams”中添加一项“NetworkAddress”的主键值,在该主键下添加名为“default”的字符串,值为要设的MAC地址,如“000FEAD559F5” (不包含引号)。

5.在“NetworkAddress”主键下继续添加名为“ParamDesc”的字符串,其作用为指定“NetworkAddress”主键的描述,值为“MAC Address”。

6.关闭注册表编辑器,重新启动,MAC地址便修改好了。

重启后,故障解决,终于能正常上网了。

三招让你的火狐启动速度变得超快

http://article.pchome.net/content-735021.html

火狐是一款非常优秀的开源浏览器,但是有的用户说它的启动速度有点忙,下面就告诉你三招,让你的火狐狸快速启动。

第一招:修改about:config参数:打开Firfox浏览器,在地址栏输入:

about:config,然后修改下面三个参数。

修改network.http.pipelining参数值为:True

修改network.http.proxy.pipelining参数值为:True

修改network.http.pipelining.maxrequests参数值为:8

第二招:配置启动参数:右键单击桌面上火狐(HuoHu)图标,然后选择:属性->快捷方式->目标,然后在目标地址后面加上参数:/Prefetch:1,就这么简单。

第三招:关闭杀毒软件:这一招比较损,不过你放心,不用担心浏览器中毒,因为火狐狸浏览器是非IE核心的浏览器,现在网络上面流行的IE浏览器病毒和木马对它来说通通没有作用。

Tuesday, October 21, 2008

PXE, aka Pre-Execution Environment - Part 1

http://thesystemadministrator.com/the_system_administrator/tips_%26_tricks/pxe%2c_aka_pre-execution_environment_-_part_1/

Tuesday, October 7, 2008

Launching remote desktop from the command line in Windows XP Pro

The Windows XP remote desktop connection dialog box provides you with everything that you need to configure and connect to another computer running Windows XP Pro. You can use the Save As button on the Connection Settings panel to save all your connection settings as an RDP file. Then, you can launch and connect to a remote computer simply by double-clicking the RDP file.
You can also script a remote desktop connection, as Windows XP's remote desktop connection has an executable file that can accept command line parameters and be run from a batch file. The remote desktop connection executable file is MSTSC.EXE, and the following are some of the most common parameters:
/v: --specifies the name of the computer to connect to.
/f --starts the connection in a full screen.
/w: --specifies the width of the remote desktop screen.
/h: --specifies the height of the remote desktop screen.
For example, to remotely connect to a computer named Kaltec in a 640 x 480 remote desktop screen, you would use the following command:
mstsc /v: Kaltec /w:640 /h:480
You can type this command line in the Run dialog box, as well as use it in a batch file.
Note: This tip applies only to Windows XP Professional.

Monday, August 25, 2008

108 Commands You can Execute from the Run Command Prompt in XP

Type the word: "control" at the command prompt.

You can also upon specific control panel folders by typing the following:
"Control Panel"
"Control desktop"
"Control color"
"Control date/time"
"Control international"
"Control mouse"
"Control keyboard"
"Control printers"
"Control fonts"

You can also open most of the components available in the control panel via Microsoft Management Console snap-ins. From the pompt, type the following commands to open their snap-in:

Certificate Manager: "certmgr.msc"
Indexing Service : "ciadv.msc"
Computer Management : "compmgmt.msc"
Device Manager : "devmgmt.msc"
Disk Defragmenter : "dfrg.msc"
Disk Management : "diskmgmt.msc"
Event Viewer : "eventvwr.msc"
Shared Folders : "fsmgmt.msc"
Group Policy : "gpedit.msc"
Local Users and Groups : "lusrmgr.msc"
Removable Storage : "ntmsmgr.msc"
Performance Monitor : "perfmon.msc"
Resultant Set of Policy : "rsop.msc"
Security Policy : "secpol.msc"
Services : "services.msc"
Windows Management Infrastructure : "wmimgmt.msc"

http://www.bloghash.com/2007/04/108-commands-you-can-execute-from-the-run-command-prompt-in-xp/

Mentioned below is a list of 108 commands that you can execute from the ‘Run’ command prompt in XP. All you have to do is click on Start » Click Run and type the below commands to run the respective application/tool.



COMMAND-Will run the following app/tool
access.cpl-Accessibility Controls
hdwwiz.cpl-Add Hardware Wizard
appwiz.cpl-Add/Remove Programs
certmgr.msc-Administrative Tools
charmap-Character Map
chkdsk-Check Disk Utility
clipbrd-Clipboard Viewer
cmd-Command Prompt
dcomcnfg-Component Services
compmgmt.msc-Computer Management
timedate.cpl-Date and Time Properties
ddeshare-DDE Shares
devmgmt.msc-Device Manager
directx.cpl-Direct X Control Panel (If Installed)
dxdiag-Direct X Troubleshooter
cleanmgr-Disk Cleanup Utility
dfrg.msc-Disk Defragment
diskmgmt.msc-Disk Management
diskpart-Disk Partition Manager
control desktop-Display Properties
desk.cpl-Display Properties
control color-Display Properties (w/Appearance Tab
Preselected)
drwtsn32-Dr. Watson System Troubleshooting
Utility
verifier-Driver Verifier Utility
eventvwr.msc-Event Viewer
sigverif-File Signature Verification Tool
findfast.cpl-Findfast
control folders-Folders Properties
control fonts-Fonts
fonts-Fonts Folder
freecell-Free Cell Card Game
joy.cpl-Game Controllers
gpedit.msc-Group Policy Editor (XP Prof)
mshearts-Hearts Card Game
iexpress-Iexpress Wizard
ciadv.msc-Indexing Service
inetcpl.cpl-Internet Properties
ipconfig /all-IP Configuration (Display Connection
Configuration)
ipconfig /displaydns-IP Configuration (Display DNS Cache
Contents)
ipconfig /flushdns-IP Configuration (Delete DNS Cache
Contents)
ipconfig /release-IP Configuration (Release All
Connections)
ipconfig /renew-IP Configuration (Renew All Connections)
ipconfig /registerdns-IP Configuration (Refreshes DHCP &
Re-Registers DNS)
ipconfig /showclassid-IP Configuration (Display DHCP Class ID)
ipconfig /setclassid-IP Configuration (Modifies DHCP Class
ID)
javaws-Java Control Panel (If Installed)
control keyboard-Keyboard Properties
secpol.msc-Local Security Settings
lusrmgr.msc-Local Users and Groups
logoff-Logs You Out Of Windows
winchat-Microsoft Chat
winmine-Minesweeper Game
control mouse-Mouse Properties
main.cpl-Mouse Properties
netstat -Netstat
control netconnections-Network Connections
ncpa.cpl-Network Connections
netsetup.cpl-Network Setup Wizard
notepad-Notepad
nvtuicpl.cpl-Nview Desktop Manager (If Installed)
packager-Object Packager
odbccp32.cpl-ODBC Data Source Administrator
osk-On Screen Keyboard
password.cpl-Password Properties
perfmon.msc-Performance Monitor
perfmon-Performance Monitor
telephon.cpl-Phone and Modem Options
powercfg.cpl-Power Configuration
control printers-Printers and Faxes
printers-Printers Folder
eudcedit-Private Character Editor
QuickTime.cpl-Quicktime (If Installed)
intl.cpl-Regional Settings
regedit-Registry Editor
mstsc-Remote Desktop
ntmsmgr.msc-Removable Storage
ntmsoprq.msc-Removable Storage Operator Requests
rsop.msc-Resultant Set of Policy (XP Prof)
sticpl.cpl-Scanners and Cameras
control schedtasks-Scheduled Tasks
wscui.cpl-Security Center
services.msc-Services
fsmgmt.msc-Shared Folders
shutdown-Shuts Down Windows
mmsys.cpl-Sounds and Audio
spider-Spider Solitare Card Game
cliconfg-SQL Client Configuration
sysedit-System Configuration Editor
msconfig-System Configuration Utility
sfc /scannow-System File Checker Utility (Scan
Immediately)
sfc /scanonce-System File Checker Utility (Scan Once At
Next Boot)
sfc /scanboot-System File Checker Utility (Scan On Every
Boot)
sfc /revert-System File Checker Utility (Return to
Default Setting)
sfc /purgecache-System File Checker Utility (Purge File
Cache)
sfc /cachesize=x-System File Checker Utility (Set Cache Size
to size x)
sysdm.cpl-System Properties
taskmgr-Task Manager
telnet-Telnet Client
tracert-Traceroute to hostname or IP
nusrmgr.cpl-User Account Management
utilman-Utility Manager
firewall.cpl-Windows Firewall
magnify-Windows Magnifier
wmimgmt.msc-Windows Management Infrastructure
syskey-Windows System Security Tool
wupdmgr-Windows Update Launches
tourstart-Windows XP Tour Wizard
write-Wordpad

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