Attaching Public IP address to VNIC in Oracle Cloud instance running Ubuntu 20.04 server

DanRan

10/30/23, 9:29 PM

I am running Ubuntu Server 20.04 on an oracle cloud instance. In Ubuntu, When I type ip a it returns the following (showing only my private Oracle IP attached to the VNIC):

2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 0X:0X:1X:1X:1X:9X brd ff:ff:ff:ff:ff:ff
    altname enp0s3
    inet 10.0.0.119/24 brd 10.0.0.255 scope global ens3
       valid_lft forever preferred_lft forever

The problem here, is that Oracle seems to assign the Oracle Private IP to the VNIC, and then NAT my Public Oracle IP address to the VNIC. The problem with this, is that I am using my Oracle Instance as a VPN Server, and need to enable port forwarding on it via /etc/ufw/before.rules. When adding the servers public IP address to the port forwarding rules, and forwarding the IP to the VPN Client, the client cannot traverse this built in Oracle NAT, and therefore, port forwarding doesn't work on the VPN Client.

Could someone please explain in detail (and possibly with screen shots), how exactly I can configure my oracle settings to attach my public IP address directly to my VNIC on my Oracle Instance, so that port forwarding can work with my vpn server?

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DanRan

1/3/24, 7:34 AM

Is anyone out there that can help me with this? I still have not found a solution.

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