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VPN Site to Site with StrongSwan fails Technical Level
  • VPN Site To Site with StrongSwan (mobile router using Linux with IPSec implementation) fails.
  • Unstable VPN connection between the VPN peers.
  • Security Gateway not able to create new keys with StrongSwan.

There is a known issue with Strongswan that it only stores (and uses) keys that are re-keys of existing keys.

There are even scenarios when Strongswan peer itself starts a new Phase 2 exchange but never stores the exchanged keys because they are not re-keys of existing key and then we are not able to decrypt the traffic encrypted with the new keys.

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