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4.4  Identification and Authentication ................................................................................. 30 
4.5  Login Banners ............................................................................................................... 30 
4.6  Virtual Private Networks (VPN) ................................................................................... 30 
4.6.1  IPsec Overview ......................................................................................................... 30 
4.6.2  IPsec Transforms and Lifetimes ............................................................................... 34 
4.6.3  NAT Traversal .......................................................................................................... 36 
4.6.4  X.509 Certificates ..................................................................................................... 36 
4.6.5  Information Flow Policies......................................................................................... 41 
4.6.6  IPsec Session Interuption/Recovery ......................................................................... 42 
4.7  Product Updates ............................................................................................................ 43 
4.8  Configure Reference Identifier ..................................................................................... 43 
5  Security Relevant Events ...................................................................................................... 45 
5.1  Deleting Audit Records................................................................................................. 62 
6  Network Services and Protocols ........................................................................................... 63 
7  Modes of Operation .............................................................................................................. 67 
8  Security Measures for the Operational Environment............................................................ 70 
9  Related Documentation ......................................................................................................... 71 
9.1  World Wide Web .......................................................................................................... 71 
9.2  Ordering Documentation .............................................................................................. 71 
9.3  Documentation Feedback.............................................................................................. 71 
10  Obtaining Technical Assistance ............................................................................................ 72