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No, you can't do that because the Elastic IP is not directly "attached" to the instance. The instance only "knows" about its private IP address, not the Elastic IP.
You could potentially get this working by doing some really interesting iptables work on the instance but it would be super complex because you wouldn't want outbound traffic to use the public IP directly from the instance except when replying to traffic that is going out the VPN - so you'd need some way to identify that. In short, I wouldn't do this.
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Thank you for your reply, that is mean that I can not use public IP for VPN, because our third-party provider wants us to use only public IP and the connection (to our web server) should be done by VPN only. can please advise the best way to achieve that?