Enterasys Networks Network Card manual Generic Routing Encapsulation GRE, 211

Appendix A

Glossary

permitting them to dial out of the network across the firewall to their own corporate network and returning to their computer. Aurorean Client uses this feature in conjunction with the HyperText Transfer Protocol Secure (HTTP-S) to successfully traverse the firewall without causing harm to the native network.

Generic Routing Encapsulation (GRE)

Tunneling protocol developed by Cisco that can encapsulate a wide variety of protocol packet types inside IP tunnels, creating a virtual point-to-point link over the Internet. For PPTP, GRE is used to encapsulate PPP data packets within an IP packet (IP packet headers contain address information necessary for routing, while PPP packets do not).

Internet Service Provider (ISP)

A vendor who provides direct access to the Internet. ISPs bill users for the amount of time they are connected, and may also offer additional services such as Web site hosting, E-mail, or news group readers. Remote users reach the ISP by dialing into an ISP POP with a computer, modem, and phone line, or over a dedicated circuit (such as a cable modem connection).

Management Channel

A portion of the tunnel connection that is used to download an updated TollSaver database from the Aurorean Policy Server to the Aurorean

Client computer. When a remote user establishes a tunnel connection to the corporate network, Aurorean Client sends a message to the Aurorean Policy Server asking if the TollSaver database has changed. If the Aurorean Client’s database is out-of-date, the Aurorean Policy Server downloads a new database during low-traffic periods, so that the download does not interfere with regular traffic between the remote user and the network.

Network Address Translation (NAT)

Described by Whatis.com as the translation of an Internet Protocol address used within one network to a different IP address known within another network. One network is designated the inside network and the other is the outside. Typically, a company maps its local inside network addresses to one or more global outside IP addresses and unmaps the global IP addresses on

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