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Your monitoring strategy is apt to have its weaknesses on your first try, so be prepared to fine-tune your strategy If you find that you are collecting too much information, and you cannot detect what is important, reduce the data you collect rather than abandon monitoring If you notice that you are not collecting an important piece of information, start collecting that data If you are getting too many alerts on your pager in the middle of the night, and most of those alerts are not significant, fine-tune the alerting procedure rather than turn off the pager An excellent solution to monitoring ISA Server, especially if you have multiple servers deployed, is to use an automated monitoring tool These monitoring tools can collect information from many sources and analyze the information Microsoft Operations Manager is one example of an automated monitoring solution that can monitor ISA Server computers for you..

Microsoft s implementation of IPSec supports offloading of encryption to network interface cards (NICs) that can perform encryption. Not every NIC can support offloaded encryption, but several are specifically designed to do so. Use of such cards can improve the performance on servers where many possible IPSec connections can be frequently used. You can read more about one of these special NICs at http://www.3com.com/products/proddatasheet/datasheet /3c905b_fx.pdf.

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The following steps explain the Quick Mode process in detail: 1. Computer Red performs an IKE mode policy lookup to determine the full policy. (IKE negotiation does not factor in the port number, IP address, or other factors that might have triggered the negotiation.) 2. Computer Red proposes its options (cryptographic as well as frequency of key changes, and so on) and filters to Computer Blue. 3. Computer Blue does its own IKE mode policy lookup. If it finds a match with that proposed by Computer Red, it completes the Quick Mode negotiation to create a pair of IPSec SAs. 4. One SA is outbound, the other is inbound, each SA is identified by a Security Parameters Index (SPI), and the SPI is part of the header of each packet sent. Com puter Red s IPSec driver uses the outbound SA and signs, and, if specified, encrypts the packets. If hardware offload of IPSec cryptographic functions is supported by the network card, the IPSec driver just formats the packets; otherwise, it formats and cryptographically processes the packets. 5. The IPSec driver passes the packets to the network adapter driver. 6. The network adapter driver puts the datagrams on the network.

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Monitoring Network Protocol Security 11-31

You can monitor real-time information by configuring alerts that are raised when specific events occur. You can also collect real-time information about client connections, server performance, and connectivity on ISA Server. Consider the following when you create a monitoring and reporting strategy:

7. The network adapter at Computer Blue receives the (encrypted) packets from the network. 8. The SPI is used to find the corresponding SA. (This SA has the associated crypto graphic key necessary to decrypt and process the packets.) 9. If the network adapter is specifically designed to perform encryption and therefore can decrypt the packets, it will do so. It passes the packets to the IPSec driver. 10. Computer Blue s IPSec driver uses the inbound SA to retrieve the keys and pro cesses the packets if necessary. 11. The IPSec driver converts the packets back to normal IP packet format and passes them to the TCP/IP driver that passes them to the receiving application. 12. IPSec SAs continue processing packets. SAs are refreshed by IKE Quick Mode negotiation for as long as the application sends and receives data. When the SAs become idle, they are deleted. 13. IKE Main Mode is not deleted when idle. It has a lifetime of 8 hours, but this num ber is configurable (5 minutes to a maximum of 48 hours). New traffic triggers a new Quick Mode negotiation. If IKE Main Mode expires, a new IKE mode is nego tiated when needed.

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