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Appendix A
Glossary
RiverMaster Administrator’s Guide
211
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database is out-of-date, the Aurorean Policy Server downloads a new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