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Appendix A

Glossary

AutoLink Recovery

An extension of the fault recovery capabilities of the Aurorean Client which includes automatic fail-over to a backup Aurorean Client system in the event of a service outage or VPN hardware failure. AutoLink Recovery

(ALR) is implemented with the installation of a second Aurorean Client system consisting of a pair of Aurorean Policy Servers and Aurorean Network Gateways. The secondary Aurorean Client system operates in

parallel with but independently of the primary Aurorean Client system. Each system must be located on the same corporate network, but can be physically situated at different sites for disaster recovery. For more information about ALR, refer to the ALR Application Note.

Client Synchronization

A two-part process which automatically upgrades Aurorean Client firmware and settings by downloading updated files from the Aurorean

Policy Server. During client synchronization, a portion of the tunnel is utilized as a management channel between the Aurorean Client computer and the Aurorean Policy Server, operating in the “background” of the client connection without any visible effect on performance. Data Synchronization

acquires revised POP, ISP, policy and other configuration data while Software Synchronization acquires new Prescriber remedies and updated Aurorean

Client program files.

Firewall

A combination of hardware and software which limits the exposure of a corporate network to outside attack by enforcing a boundary between the network and the Internet. Firewalls normally fall into one of two categories: application-level or network-level (often referred to as a packet filter). An application-level firewall examines traffic at the application level, and only passes packets that are sent by approved applications (such as FTP, E-mail, or Telnet). This type of firewall often readdresses outgoing traffic so that it appears to have originated at the firewall rather than an internal host, thereby concealing the address of the internal host. A network-level firewall examines

traffic at the network packet level, and filters packets based on the destination and/or source address. The Aurorean Network Gateway offers Firewall/NAT Traversal as a policy option to Aurorean Client users such as contractors,

visitors and others, who are connected temporarily on internal networks,

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