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Remote Access Server Configuration Guidelines
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Follow these guidelines to configure the remote access server:
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Use packet filters on the remote access server to ensure only VPN protocols are accepted on the Internet-facing connection. Configure both PPTP and L2TP/IPSec VPN protocols in cases where some clients cannot use L2TP/IPSec but you want to secure communications with the highest security possible. Clients will always try to use L2TP/IPSec unless configured to use PPTP. Choose most secure authentication protocols:
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Do not allow PAP for authentication because it requires a clear-text password. Require smart cards for authentication where possible. Where EAP is not an option, ensure MS-CHAPv2 is the only protocol selected. (By default, MS-CHAP is also selected.) Configure VPN server authentication so that MS-CHAPv2, EAP authentication types, or both are the only authentication choices. Clients that are not config ured to use selected server protocols will not be able to connect.
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Configure encryption strength to the strongest option available. This will provide 128-bit MPPE (for PPTP connections) and 3DES IPSec (for L2TP/IPSec) connec tions. Use remote access policies:
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Use IAS if more than one remote access server is required. This means con sistent remote access policy application and improved accounting. Use packet filters on the remote access policy profile settings for the VPN connection to ensure that only traffic originating from remote access clients is accepted. The default remote access policy Connections To Microsoft Routing And Remote Access Server has these packet filters configured.
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If an ISP s RADIUS database is used for authentication, use IAS proxy services to direct authorization choices to internal remote access services. This provides you with control over authorization.
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Designing VPN Connectivity
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Guidelines for Network Deployment
Follow these guidelines:
Place the VPN server between two firewalls on a perimeter network. Configure the external firewall to direct only VPN traffic to the VPN server. Configure the internal firewall to filter all traffic for viruses, worms, Trojans, and so on.
Practice: Designing a Remote Access Server VPN
In this practice, you will make choices for a remote access server VPN for a fictitious company. Read the scenario and then answer the questions that follow. If you are unable to answer a question, review the materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of the chapter.
Important Answers in this practice depend on knowledge gained in previous lessons and possibly earlier chapters.
Scenario
Humongous Insurance has decided that its dial-up remote access connections must
be replaced with VPNs. More than 2000 clients use the current remote access config
uration. The company has hired you to be the new tunnel administrator and has
given its approval for the purchase of whatever equipment and software you recom
mend for the establishment of its new VPN infrastructure. The following require
ments must be met:
All VPNs must be remote access VPNs.
The new infrastructure must be designed for the highest level of security.
Consistency and redundancy are paramount.
Deployment and maintenance must be automated.
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7
Designing Secure Communications Between Networks
Review Questions
Answer the following questions. 1. What VPN protocol will you select
2. What authentication choices will you allow
3. What encryption strength will you require
4. What are the certificate requirements of this design
5. What type of certificate infrastructure is required, and how will certificates be deployed
Lesson 3
Designing Demand-Dial Routing Between Private Networks
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Lesson 3: Designing Demand-Dial Routing Between Private Networks
After this lesson, you will be able to
Explain what site-to-site demand-dial routing is. Design secure demand-dial routing.
Estimated lesson time: 45 minutes
What Is Demand-Dial Routing
Demand-dial routing is the creation of an on-demand connection between two networks. When a client computer directs communications to another network, a routing device initiates a connection with the other network. Site-to-site VPNs can be created by using a demand-dial connection and a VPN tunneling protocol to create a compul sory tunnel (a tunnel that must be used if data travels this path) in response to a client request to route data between two networks. This can be accomplished by:
Important Demand-dial routing is also referred to as gateway-to-gateway VPN, router-torouter VPN, or site-to-site VPN. In this book, the VPN configuration that uses demand-dial rout ing will be referred to as a site-to-site VPN, and the connection type will be called demand-dial routing. In this book, the term demand-dial routing is the same as saying site-to-site VPN, but you should realize that demand-dial routing can exist without the protection of a compulsory tunnel. Also, note that the VPN server used as part of a demand-dial connection is called a VPN router, and the VPN server to which clients connect by using VPN client software is called a remote access VPN server.
Providing two VPN servers one on the perimeter of each network and then configuring at least one of them to connect to the other and create the tunnel when a connection request is made. Providing two VPN servers one at each location with a dial-up connection to an ISP and then configuring at least one of them to connect to the other and create the tunnel when a connection request is made.
A remote access VPN requires the client computer to have VPN software and a VPN tunneling protocol installed, and it requires that the client request a VPN connection. The site-to-site demand-dial VPN does not. Instead, the two VPN servers create the VPN. One of them, the calling router, acts as if it were the VPN client. The calling router initiates the connection with the answering router (the computer that plays the VPN server role) in response to a request from a client computer to connect to a com-
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