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18
C
ONFIGURING
G
ENERIC
R
OUTING
E
NCAPSULATION
18.1 Configuring GRE
Generic Routing Encapsulation (GRE) is a standards-based (RFC1701, RFC2784) tunneling protocol that can
encapsulate a wide variety of protocol packet types inside IP tunnels, creating a virtual point-to-point link between
routers at remote points over an IP network. A tunnel is a logical interface that provides a way to encapsulate passenger
packets inside a transport protocol. By connecting multiprotocol subnetworks in a single-protocol backbone
environment, IP tunneling using GRE allows network expansion across a single-protocol backbone environment.
IPSec and GRE complement each other well, while IPSec provides a secure method of transporting data across the
internet GRE provides the capability to transport routing protocols (for example: OSPF) that use broadcast and
multicast.
18.2 Installing Licenses
There are three licenses that control access to the features:
Basic VPN Management (vpn_mgmt)—allows users to manage a remote Black Box router.
Firewall (firewall)—allows users to manage the firewall features. Also includes Basic VPN Management.
Advanced VPN and firewall (vpn_plus_firewall)—Allows users to manage remote LANs. Also includes
Basic VPN and Firewall licenses. Use this license to access the GRE features in this release.
To see the licenses available in this release, enter: