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 NetworkManager is disabled on Charon-SSP OCI. Therefore, the interface configuration relies on ifcfg-files in /etc/sysconfig/network-scripts.

 The information in this chapter is not comprehensive. Please refer to the Oracle cloud documentation for up-to-date and comprehensive information.

Concepts

VCN: VCN stands for Virtual Cloud Network. Before you can launch an instance, you need to have a virtual cloud network (VCN) and subnet into which you can launch the instance. A VCN is associated with resources such as a CIDR address block, a route table, an Internet gateway, a default security list, etc.

Subnet: A subnet is a subdivision of the VCN. The subnet directs traffic according to a route table. For example, if you access the instance via a public IP address, the route table will direct traffic to an internet gateway. A subnet also uses a security list to control traffic in and out of the instance.

Instance: An instance is a virtual machine that is launched into a VCN and subnet. It is associated with an image (e.g., Charon-SSP image) and a certain shape representing the virtual hardware.

VNIC: A virtual network interface card, which attaches to an instance and resides in a subnet to enable a connection to the subnet's VCN. The VNIC determines how the instance connects with endpoints inside and outside the VCN. Each instance has a primary VNIC that's created during instance launch and cannot be removed. All VNICs of an instance must be in the same availability domain as the instance.

Address Assignment

Each VCN is assigned a block of private IP addresses. This block can be split by the user to form several IP subnets. Routing within one VCN works automatically.

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• it is automatically assigned a private IP address from the address range assigned to the subnet,
• the user can choose whether to assign a public IP address if the subnet is a public subnet.

 Public IP addresses are not directly visible to the instance. The instance operating system always works with the private address. For external connections, the private address is mapped to the public IP address via NAT.

Reserved addresses (important, if manual address assignment is used):

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Other special addresses:

• 169.254.0.0/16: Reserved for OCI use.

Public IP addresses:

There are two types of public IP addresses (only available in public subnets):

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Access to the Internet for private VCN subnets is possible across a gateway instance providing VPN access to the customer network and allowing (NATted) Internet access via this path. Alternatively, a NAT gateway in the cloud can be used to map the private addresses to public addresses. The NAT gateway can be implemented on a Charon host system or it can be provided by OCI for a charge.
Please note that the Charon host always needs either direct Internet access or Internet access via NAT from a NAT gateway in the OCI cloud to access the license server.

Direct Solaris guest access to the Internet:

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