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Remote Access Policy Profile Packet Filtering
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As described earlier, just because the user has access to the network via VPN, that does not mean that the user should have access to every resource on the network while accessing from an unsecured location. Remote access policies that define authorization and connection constraints can be used to specify a set of IP packet filters that are applied per user or group to remote access connections. When the connection is accepted, the packet filters define the types of IP traffic that are allowed from and to the VPN client. This feature can be used for extranet connections. An extranet is a portion of your organization network that is accessible to users outside the organization, such as business partners and vendors. By using remote access policy profile packet filtering, you can create a remote access policy that specifies that members of the Partners group can only access the Web servers at specific IP addresses or on a specific subnet. This feature can also be used to prevent VPN remote access clients from sending packets that they did not originate. When the remote access client computer makes the VPN connection, by default it creates a default route so that all traffic that matches the default route is sent over the VPN connection. If other computers are forwarding traffic to the remote access VPN client, treating the remote access client computer as a router, then that traffic will also be forwarded across the VPN connection. This is a security problem because the VPN server has not authenticated the computer that is forwarding traffic to the remote access VPN client. The computer forwarding traffic to the remote access VPN client computer has the same network access as the authenticated remote access VPN client computer. To prevent the VPN server from receiving traffic across the VPN connection for computers other than authenticated remote access VPN client computers, configure remote access policy packet filters on the remote access policy that is used for your VPN connections. The default remote access policy for Windows Server 2003 named Connections To Microsoft Routing And Remote Access Server already has the correct input packet filters for this configuration. Note Although this is the default setting for the VPN server to apply filters for all individual remote users, this can make the IP filter list quite huge in a largescale environment, thus potentially causing a performance hit. If you are seeing performance degrade when going into the thousands of users per gateway, make sure to use Quarantine to check to make sure the client s routing bits are disabled, thus blocking the client from acting as a router, and then disable the individual IP filters and see if this improves performance.
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To secure VPN connections and their data, Windows Server 2003 and Windows XP support a wide array of security features. Basic elements of security are authentica tion security (the use of MS-CHAP v2 or EAP-TLS), authorization security (dial-in properties of a user account and remote access policies), encryption security (MPPE for PPTP and DES/3DES for L2TP/IPSec), and packet filtering (for PPTP and L2TP/IPSec traffic). Advanced security features include EAP-TLS for certificatebased authentication, Network Access Quarantine Control to verify the configura tion of the remote access client computer, remote access account lockout to prevent online dictionary attacks, and remote access policy profile packet filtering to define the traffic that is allowed over the VPN connection. There are obviously a lot of choices to make here, but the best method to use is to default to the highest security levels that are appropriate for your design: use MSCHAP v2 or EAP-TLS, use L2TP/IPSec and IP filters as much as possible, and use machine and user certificates to enable two-factor authentication with smart cards or other EAP devices. Don t go overkill on it make it secure enough to mitigate your needs. The more security you enable, the more you increase the amount of administration and user support you will have to deal with weigh both sides of security vs. supportability to meet your company s constraints on support resources.
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