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Using IPSec Tunnel Mode
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IPSec tunnel mode is used for network-to-network connections (IPSec tunnels between routers) or host-to-network connections (IPSec tunnels between a host and a router). Used this way, IPSec must be supported on both endpoints, and each endpoint must support the same
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Part III:
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authentication protocols and have compatible IPSec filters configured and assigned. IPSec tunnel mode is commonly used for site-to-site connections that cross public networks, such as the Internet.
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Selecting an IPSec Authentication Method
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During the initial construction of the IPSec session also known as the Internet Key Exchange, or IKE each host or endpoint authenticates the other host or endpoint. When configuring IPSec, you must ensure that each host or endpoint supports the same authentication methods. IPSec supports three authentication methods:
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Because IPSec requires mutual authentication, it also can be used to control network access to computers on your network that store high-value assets. For more information on how you can use IPSec this way, see the white paper Using Microsoft Windows IPSec to Help Secure an Internal Corporate Network Server on the Microsoft Web site at http: //www.microsoft.com/downloads/details.aspx FamilyID=a774012a-ac25-4a1d-8851b7a09e3f1dc9&displaylang=en.
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Authenticating with Kerberos
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Kerberos is used for IPSec mutual authentication by default. For Kerberos to be used as the authentication protocol, both hosts or endpoints must receive Kerberos tickets from the same Active Directory forest. Thus, you should choose Kerberos for IPSec authentication only when both hosts or endpoints are within your own organization. Kerberos is an excellent authentication method for IPSec because it requires no additional configuration or network infrastructure. Important
Some types of traffic are exempted by default from being secured by IPSec, even when the IPSec policy specifies that all IP traffic should be secured. The IPSec exemptions apply to Broadcast, Multicast, Resource Reservation Setup Protocol (RSVP), IKE, and Kerberos traffic. Kerberos, a security protocol itself, can be used by IPSec for IKE authentication. To remove the exemption for Kerberos and RSVP, set the value NoDefaultExempt to 1 in the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSEC, or use the Nodefaultexempt.vbs script located in the Tools\Scripts folder on the CD included with this book.
19:
Implementing TCP/IP Security
Authenticating with X.509 Certificates
You can use X.509 certificates for IPSec mutual authentication of hosts or endpoints. Certificates enable you to create IPSec-secured sessions with hosts or endpoints outside your Active Directory forests, such as with business partners in extranet scenarios. You also must use certificates when using IPSec to secure virtual private network (VPN) connections made by using Layer Two Tunneling Protocol (L2TP). To use certificates, the hosts must be able to check hat the other s certificate is valid.
Authenticating with Preshared Key
You can use a preshared key, which is a simple, case-sensitive text string, to authenticate hosts or endpoints. Preshared key authentication should be used only when testing or troubleshooting IPSec connectivity because the preshared key is not stored in a secure fashion by hosts or endpoints.
Creating IPSec Policies
IPSec is a policy-driven technology. In Windows Server 2003, Windows 2000, and Windows XP, you can have only one IPSec policy assigned at a time. IPSec policies are dynamic, meaning you do not have to stop and start the IPSec service or restart the computer when assigning or unassigning IPSec policies. You can also use Group Policy to deploy IPSec policies to clients running Windows Server 2003, Windows 2000, and Windows XP. The Windows operating system includes three precreated IPSec policies:
Client (Respond Only) A computer configured with the Client policy will use IPSec if the host it is communicating with requests using IPSec and supports Kerberos authentication. Server (Request Security) A computer configured with the Server policy will always attempt to negotiate IPSec but will permit unsecured communication with hosts that do not support IPSec. The Server policy permits unsecured ICMP traffic.
A computer configured with the Secure Server policy will request that IPSec be used for all inbound and outbound connections. The computer will accept unencrypted packets but will always respond by using IPSec-secured packets. The Secure Server policy permits unsecured ICMP traffic.
Secure Server (Require Security)
In addition to the precreated policies, you can create custom IPSec policies. When creating your own IPSec policies, you must configure rules that include the following settings:
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