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By Sean Convery, and Bernie Trudel

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As in remote-access VPN, 3DES and SHA-HMAC are used for IKE and IPSec parameters to provide the maximum security with little effect on performance. IPSec hardware accelerators are used in the VPN routers. Rest of the module The traffic from the three services is aggregated by the firewall onto one private interface before being sent to the edge distribution module via a pair of routers. The firewall must be configured with the right type of constraining access control to allow only the appropriate traffic through to the inside interface of the firewall from each of the services.

This connection must be permitted by the first firewall, as well as the associated return traffic. As in the case with the Web server, there is no reason for the application server to initiate a connection to the Web server or even out to the Internet. Likewise, the user’s entire session runs over HTTP and SSL with no ability to communicate directly with the application server or the database server. Cisco Systems Copyright © 2000 Cisco Systems, Inc. All Rights Reserved. Page 34 of 66 At one point, the user will want to perform a transaction.

IPSec hardware accelerators are used in the VPN routers. Rest of the module The traffic from the three services is aggregated by the firewall onto one private interface before being sent to the edge distribution module via a pair of routers. The firewall must be configured with the right type of constraining access control to allow only the appropriate traffic through to the inside interface of the firewall from each of the services. In addition to access control, the firewalls provide a point of auditing for all VPN traffic and an enforcement point for NIDS threat response.

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


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