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Do not make the VPN router computer a DHCP client on either the internal or external interface. Where possible, dedicate the VPN router to demand dial-connections rather than allowing remote access connections. By default, both types of connec tions are allowed. You can prevent remote access connections by clearing the Remote Access Server check box on the General tab of the VPN Servers Prop erties dialog box. These guidelines include: If multiple connections with remote sites are required, use a separate remote access network interface (which can be done via a configuration choice in the remote access server console) and user account for each demand-dial con nection required. This will help you monitor connections. This will result in fewer people knowing the password for an individual demand-dial user account. If you need to remove access for a specific location, you can do so by simply removing that site s interface. Because no one at that site knows the password for any other interface, nobody can reconnect without your inter vention. To manage multiple demand-dial interface user accounts, create a Windows group for these accounts and use remote access policies to manage the con nections.

8

For optimum security, Microsoft recommends that you do not assign administrators to the Administrators group and that you avoid running your computer while logged on as an administrator. This lesson examines reasons why you should not run your computer as an administrator and the actions you should take to ensure security for administrators.

7-34

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Explain why you should not run your computer as an administrator Explain the groups administrators should use to log on Explain how to use the Run As program to start a program as an administrator

7

Running Windows Server 2003 as an administrator makes the system vulnerable to Tro jan horse attacks and other security risks. The simple act of visiting an Internet site can be extremely damaging to the system. An unfamiliar Internet site might contain Trojan horse code that can be downloaded to the system and executed. If you are logged on with administrator privileges, a Trojan horse could possibly reformat your hard drive, delete all files, create a new user account with administrative access, and so on. Therefore, you should not assign yourself to the Administrators group and you should avoid running your computer while logged on as an administrator. For most computer activity, you should assign yourself to the Users or Power Users group. When you log on as a member of the Users group, you can perform routine tasks, including running programs and visiting Internet sites, without exposing your computer to unnecessary risks. As a member of the Power Users group, you can perform routine tasks and also install programs, add printers, and use most Control Panel items. If you need to perform an administrator-only task, such as upgrading the operating system or configuring system parameters, you should log on as an administrator, perform the task, and then log off. If you frequently need to log on as an administrator, you can use the Run As program to start programs as an administrator.

The Run As program allows a user to run specific tools and programs with permissions other than those provided by the account with which the user is currently logged on. Therefore, you can use the Run As program to run administrative tools with either local or domain administrator rights and permissions while logged on as a normal user. The

VPN protocols These guidelines include:

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8-31

Use L2TP/IPSec where possible, as it provides stronger security L2TP/IPSec can be used behind a NAT router in a site-to-site configuration if both VPN routers are using Windows Server 2003 Provide both L2TP/IPSec and PPTP if you must support VPN routers that do not support L2TP/IPSec, or for routers for which certificate services are not available Use the strongest encryption possible for each interface Do not use operating systems as VPN routers that cannot use the highest strength encryption These guidelines include: Use a local account for the user credentials (which is the default), and use a long, strong password Schedule a periodic manual change of the password, and coordinate this with the administrator of the other VPN router Where possible, use EAP for the authentication mechanism EAP/MS-CHAPv2 does not require client computers to have a computer cer tificate (Users use passwords as usual.