Netvanta routers provide IKEv1 key exchange and IPSec secure VPN tunnel communication. OpenVPN uses TLS to authenticate peers instead of IKE. It is as secure, but because it is implemented in userspace, rather than the OS kernel, is not as efficient as IPSec. That said it is about time that the Netvanta VPN implementation was upgraded to IKEv2, which is used by many mobile devices today.
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Regards,
Mick