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Allow privileges for remote access only to the appropriate users, and make sure that a proper remote access policy is in place. Allowing all users to have access to the VPN systems of the company is the easiest thing to do, but often it is not the most practical thing to do. Limit privileges for remote access systems to users who have a definite need for them. Allow access only to full-time employees and contractors that require access. By doing so, you reduce the attack surface a hacker has to attack your system, the need for redun dancy, the load on the gateways, and the amount of extraneous access to the Active
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Appendix A
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VPN Deployment Best Practices |
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Directory environment. If you are using certificates, restricting access also cuts down on the amount of certificate revocation you will need to do as contractors and partners complete their projects.
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Packet Filters
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Use the automated packet filter systems incorporated into the Routing And Remote Access service for remote access connections. You can turn off this default functionality if you want. Many consultants will tell you there is an increase in performance by doing so, but if the load is that high you should implement load-balancing to take care of the overhead, not reduce security. Also, do not add too many packet filters to the automatically plumbed list. Every packet filter does affect throughput and performance of the system, so be frugal in your use of packet filters.
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Unless there is no avoiding it, do not use split-tunneling. To comply with industry standards, Microsoft allows for split-tunneling on VPN sys tems through the use of Connection Manager. You can also implement split tunnel ing by using DHCPInform messages and the Classless Static Routes DHCP. Although Microsoft provides this support, the recommendation is that you do not deploy split-tunneling. Split-tunneling has an inherent security hole on the client side of the link that could result in someone gaining unauthorized access to the corporate intranet. By disabling routing on the VPN client and disabling split-tunneling, you immediately prevent a major security risk. In their own implementation of VPN, one of the options that Microsoft checks for on each VPN client is the disablement of split-tunneling on the VPN client prior to allowing access to the Microsoft intra net. We recommend that you do the same for your company.
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Use of Quarantine Being Realistic
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Remember that quarantine relies on running a client script and the longer the script, the longer the quarantine check and the slower the access is to the corporate LAN. Make the script reasonable, less than 30 seconds of processing time. Quarantine can be a very powerful tool, and it is highly recommended that you use the quarantine features of Windows Server 2003 for client conformity checks prior to allowing access to the corporate LAN. Keep in mind the following issues when deploying quarantine:
Keep the client-side scripting short and simple. If the script takes too
long to run, the user will incorrectly assume the connection is stalled and will naturally cancel the connection and start over. This reaction causes the whole process to start again. A good way to mitigate this is to put a graphi cal progress bar on the client screen so that the user knows something is
PART IV
Appendixes
happening and that progress is being made. Microsoft Operations Technol ogy Group has done this for its VPN users, and it has been very successful. Quarantine operates as a custom connect action on Connection Manager, so see 7 for more information.
Use a quarantine network rather than allowing access to individual
resources in the corporate LAN. You ll be tempted to just punch through access to resources that are already in place, but remember that every quarantined user will be getting IP filters created to them for quaran tine access. To cut down on filter lists and processor usage, create a small quarantine network that has all the resources and then allow access for quarantined users to that network segment. This means that only one IP fil ter needs to be plumbed (the filter that allows access to that IP segment), and LAN access is still protected.
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