Generic Routing Encapsulation
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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
Alcatel-Lucent
GRE CONFIGURATION SCENARIOS USING OMNIACCESS 5740
USG
GRE protocol is used to tunnel either IP or non-IP packets across an IP cloud. In
the legacy applications, GRE was used to transport non-routable protocols like
SNA and non-IP protocols like IPX, Appletalk, and DECnet since normal IP
Security (IPsec) configurations could not transfer routing protocols, such as
OSPF.
In current applications, IPsec provides security by encrypting packets sent over
GRE tunnels.
The following features can be configured on a GRE Tunnel:
• GRE
• GRE + IP Filters + DoS
• GRE over IPsec
1. GRE CONFIGURATION
The OmniAccess 5740 USG topology below consists of the following
components:
• OA5740-A
• OA5740-B
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