GRE over IPsec allows you to combine the advantages of GRE (multicast and broadcast support) and IPsec (transmitting traffic in encrypted form). A GRE over IPsec connection encapsulates the traffic in GRE packets and then transmits them over an encrypted link (IPsec encapsulation).
To configure GRE over IPSec, follow these steps:
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Task |
Description |
|---|---|
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Step 1. Configure a site‑to-site VPN connection. |
For more details on configuring a site-to-site VPN connection, see the section Site-to-Site VPN connections. |
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Step 2. Configure a GRE tunnel. |
For more details on configuring a GRE tunnel interface, see the section Tunnel Interface. Important! When configuring a GRE tunnel interface, make sure to specify the addresses of the VPN interfaces as the source (local) and destination (remote) IP addresses. |