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By Sean Convery, and Bernie Trudel

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These types of designs tend to be very firewall centric and do not adequately take advantage of IDS and other security technologies to mitigate the risk of a single firewall vulnerability. Enterprise Options The design process is often a series of trade-offs. This short subsection of the document highlights some of the high-level options that a network designer could implement if faced with tighter budget constraints. Some of these trade-offs are done at the module level, while others are done at the component level.

2 crypto map secure1 ! ! EIGRP Routing to keep links up ! 0 distribute-list 2 out Cisco Systems Copyright © 2000 Cisco Systems, Inc. All Rights Reserved. Page 54 of 66 distribute-list 2 in ! Crypto ACLs ! 2 ! Inbound ACLs from Internet ! 27 access-list 110 deny ip any any log WAN Module Figure 36 WAN Module: Detail Allow Only IPsec Traffic To Internet Via the Corporate Internet Module Authenticate Users Terminate IPsec Focused Layer 4-7 Analysis Broad Layer 4-7 Analysis To Edge Distribution Module PSTN Stateful Packet Filtering Authenticate Remote Site Authenticate Users Basic Layer 7 Filtering Terminate IPsec Terminate Analog Dial Products Used Cisco 3640 IOS Router Cisco Systems Copyright © 2000 Cisco Systems, Inc.

These queries run through the second firewall to the database server. Depending on the specific applications in use, the database server might need to communicate with back-end systems located in the server module of the enterprise. In summary, the firewalls must allow only three specific communication paths, each with its own protocol, and block all other communication unless it is the return path packets that are associated with the three original paths. The servers themselves must be fully protectedespecially the Web serverwhich is a publicly-addressable host.

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A Security Blueprint for Enterprise Networks by Sean Convery, and Bernie Trudel

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