Update GRE configuration with dynamic addresses
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Running a GRE tunnel over IPSec with IKEv2 is a common scenario. This is easy to configure on client, but has an issue on server side: client IP addresses are assigned dynamically via mode-config and have to be updated for GRE interface.
This script handles the address updates and disables the interface if the client is disconnected.
Just install the script:
... and add a scheduler to run the script periodically:
The configuration goes to interface's comment. Add the client's IKEv2 certificate CN into the comment: