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Several important changes were made to IPSec in Windows Server 2003. The changes can be grouped into three categories: management, security, and interoperability. For improved management, the IPSec Monitor MMC snap-in that was first shipped with Windows XP has been added to the server platform to replace the IPSecmon.exe tool in Windows 2000. Windows Server 2003 also adds the ability to use logical addresses in addition to IP addresses. This can be useful when the IP addresses for computers change somewhat frequently as can happen if they get their addresses from a DHCP server. The most important manageability change to IPSec in Windows Server 2003 is the ability to configure IPSec through the network shell, Netsh. You can enter the network shell by typing netsh at the command line and can execute Netsh commands by placing them in batch files. In fact, several setting for IPSec can be set only through Netsh:

name (such as www.microsoft.com or detroit.support.tailspintoys.com) and letting a DNS server resolve (look up) the fully qualified domain name (FQDN) into its associated IP address (such as 192.168.3.42), which is the address format actually used to route traffic over TCP/IP networks. TCP/IP networks include Windows networks as well as the Internet. domain A Microsoft network that uses one or more Windows servers designed to manage the network and provide network services for Windows clients. A domain contains one or more domain controllers that hold the user account database as well as other information about network services. Additional servers can be used to provide other administrative services for the domain or to serve files to users on the network. Dynamic Host Configuration Protocol (DHCP) A protocol used to automatically configure client IP address information for computers when they join a network. DHCP specifies the manner in which the DHCP client and server negotiate an address for the client s use. The process of assigning addresses involves a DHCP server and a DHCP client. The DHCP server holds information about the address range in use, the remaining addresses available, the network gateway, the DNS server addresses, the WINS server addresses, and other administratively configurable options. A particularly important function of the DHCP server is to administer the lease period. The lease period is the amount of time that any DHCP client is allowed to keep its address without checking in with the server. At the end of the lease, the client must query the server to see if the address is still valid.

Default exemption handling Strong certificate revocation list (CRL) checking IKE logging IPSec driver logging Persistent policies Startup exemptions

For example, you can set the default exemption level to allow multicast and broadcast traffic by typing the following string at the command prompt: Netsh ipsec dynamic set config ipsecexempt value=2 You can set it back to its default value by typing: Netsh ipsec dynamic set config ipsecexempt value=3 To improve the security of IPSec, several enhancements were made. The DH key length was increased to 2048 bits to better protect the secret key. To prevent an attacker from exploiting a system between the time a system is powered on and when the IPSec driver is loaded and running, Windows Server 2003 adds a computer startup policy. The computer startup policy, which can be configured though Netsh, is by default configured to

Part III: