GRE Configuration Scenarios using OmniAccess 5740 USG
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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
3. GRE OVER IPSEC CONFIGURATION
The following figure displays a typical scenario to configure GRE over IPsec:
Figure 43: GRE + IPsec Configuration Topology
IPsec is used for transport mode encryption for tunneled traffic only. Ensure tunnel
end-point reachability from OA5740-A.