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Lesson 1: Securing Network Traffic
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Lesson 1: Securing Network Traffic
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IP Security (IPSec) is a means to protect network data by ensuring its authenticity, its confidentiality, or both. In Windows Vista, you have a choice of implementing IPSec on your network either through IPSec policies or Connection Security Rules. For the 70-622 exam, you need to understand how to configure IPSec through both of these methods.
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After this lesson, you will be able to: n Deploy IPSec on a network through an IPSec policy. n Deploy IPSec on a network through Connection Security Rules. Estimated lesson time: 60 minutes
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What is IPSec
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IPSec is essentially a way to provide security for data sent between two clients on an IP network. IPSec is not just a Windows feature; the Windows implementation of IPSec is based on standards developed by the Internet Engineering Task Force (IETF) IPSec working group. IPSec protects data between two IP addresses by providing the following services:
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Data origin authentication. You can configure IPSec to ensure that each packet you receive from a trusted party originates in fact from that party and is not spoofed. Data integrity. You can use IPSec to ensure that data is not altered in transit. Anti-replay protection. You can configure IPSec to verify that each packet received is unique and not duplicated. You can use IPSec to encrypt network data so that the data is unreadable if captured in transit.
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In Windows Vista, IPSec is enforced either by IPSec policies or Connection Security Rules. IPSec policies by default attempt to negotiate both authentication and encryption services. Connection Security Rules by default attempt to negotiate only authentication services. However, you can configure IPSec policies and Connection Security Rules to provide a combination of these data protection services.
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NOTE
IPSec beyond Windows
Because it is an interoperable standard, IPSec can be implemented to secure communications between Windows and non-Windows computers.
10
Managing Network Security
IPSec Policies
IPSec policies define how a computer or group of computers handle secure communications. You can assign an IPSec policy either to an individual computer in Local Security Policy or to a group of computers in Group Policy. Although you may define many IPSec policies for use on a computer or network, only one policy is ever assigned to a computer at any given time. Figure 10-1 shows a Group Policy object (GPO) in which an IPSec policy is assigned.
Figure 10-1 IPSec policies in a GPO
Every IPSec policy is comprised of one or more IPSec policy rules that determine when IP traffic should be protected. These rules in turn are comprised of IP filters and filter actions. Filters define a source or destination address, address range, computer name, TCP/UDP port, or server type (DNS, WINS, DHCP, default gateway). If traffic leaving or arriving at a computer on which a policy is assigned matches one of the assigned policy s IP filters, the corresponding filter action is applied. Possible filter actions are block, permit, or negotiate security. When matching a source or destination address, the most specific IPSec policy rule always takes precedence.
NOTE
How is security negotiated
Negotiate Security is a general option for a f ilter action, but you can then specif ically choose the way security is negotiated for that f ilter action. For example, should encryption or merely authentication (data integrity) be negotiated What is the order of preference for encryption technologies or hashing algorithms Is it okay to fall back to unsecured communications if no common protocol
Lesson 1: Securing Network Traffic
for security can be agreed upon Because there are so many ways that you can choose to negotiate security for a f ilter action, it is possible to def ine many distinct rules for which the Negotiate Security option has been selected. Remember also that security can be successfully negotiated only when both ends of an IPSec connection can agree on the particular services and algorithms used to protect the data.
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