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• Create a cloud instance in which the Charon host system runs.
• Add two NICs to the Charon host system. One for the Charon host and one for the guest system.
• Configure the appropriate access rules for instance and NICs.
• One NIC is dedicated to the Charon host, one to the guest system. Configure a private and public IP address for the NIC used by the Charon host. Configure a private IP address for the NIC used by the guest system (and optionally a public IP address - not recommended).
• On the Charon host (Linux level), remove the private IP address from the NIC dedicated to the guest system if it was automatically configured and ensure that the interface will be enabled when the system starts.
• Assign the appropriate NIC to the guest system.
• Configure the guest system MAC address to be the same as the one of the NIC selected for the guest (if this is not done automatically by your emulator product).
• After booting the guest system, configure the private IP originally assigned by the cloud provider to the NIC dedicated to the guest as the IP address of the guest Ethernet interface.
• Set the default route of the guest system to the default gateway or VPN gateway of the LAN.

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• The sample configuration assumes a CentOS 7 system and that the interface is configured outside the control of the NetworkManager.
• Should the NetworkManager be active, the plugin ifcfg-rh must be enabled in section main of the NetworkManager configuration file /etc/NetworkManager/NetworkManager.conf. It enables the NetworkManager to read and write ifcfg-files.
• After the initial creation of the ifcfg-file, the interface can be managed by the Charon-SSP Manager.
• For the full feature-set of the file-based network configuration, the network-scripts package is required.

To make the second interface usable for the Charon guest system, perform the following steps:

1. Add a second interface to your instance as described in the cloud-specific Getting Started guide and your cloud provider's documentation.
   
   
2. Log into the instance and become the root user (use: sudo -i)
   
   
3. Identify the names of the two Ethernet interfaces:
   # ip link show
   
   
4. Create an interface configuration file for the second interface.
   1. A file for the first interface may exist depending on the default of the cloud environment. In this case, you can copy  Example (use correct interface name for your configuration):
      # cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth1


   2. If there is no file that can be copied, you must create the ifcfg-file for the new interface manually.
      
      
5. Edit this file to match the characteristics of eth1 (use correct interface name for your configuration). The private IP address used for this interface will be assigned to the guest system. Therefore, configure the Linux Interface without IP address, similar to the example below.
   
   BOOTPROTO=none
DEVICE=eth1
NAME=eth1
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
NM_CONTROLLED=no 
   
   Please note:
   On some cloud platforms, the automatic cloud-specific configuration prevents the entries in the ifcfg-file to take effect (for example on GCP). Please refer to your cloud-provider's documentation and the Network Management section in the Getting Started Guide of your version for additional information.       


6. Restart the network:
   # systemctl restart network
Please note: Should there be an error when executing this command, kill the DHCP client process and retry the command.

NetworkManager-based Configuration Examples

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• For Charon-SSP: start the Charon Manager and open the configuration window for the emulated system.
• For other emulator products: open the configuration file with a text editor.
• Configure the emulated system with the dedicated Ethernet interface as its interface.
• Set If your emulator product does not do so automatically, set the MAC address to the same value as used by the host interface (the value assigned by your cloud provider).
• Save your configuration.

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