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An automatically assigned public IP address is released by AWS for example if
- a second interface with a private address is added to the instance and the instance or the network is then stopped and restarted,a second interface with a public IP (
- an Elastic IP ) is added to associated with the instance and the instance or the network is restarted,
- an Elastic IP address is added to associated with the primary interface of the instance.
See https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-instance-addressing.html for details.
An automatically assigned public IP address is not persistent. Every time a instance starts, it is assigned a new public IP address. If persistent public addresses are needed, use Elastic IP addresses.
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- Internal virtual bridge on the host system:
Such a bridge has several TAP interfaces. The host and the guest systems are connected to this bridge and can communicate directly to one another using L3 and L2 protocols. The bridge uses its own IP subnet that can be defined by the user. Setting up such a configuration is supported by the Charon Manager. - Communication via the AWS subnet LAN:
In this case, a second interface is added to the Charon host system. The second interface is then assigned to the emulated guest system. After the correct configuration, the host and guest can communicate across the AWS LAN using IP. L2 protocols or any protocols that require changing the MAC address to something different than the MAC address assigned to the second interface by AWS will not work.
To connect the guest system to the LAN, the following basic configuration steps must be performed:- Add the additional interface to the Charon host system.
- Create a configuration file for the additional interface.
- Remove the private IP address assigned to the second interface by AWS from the Linux configuration.
- Use Charon Manager to assign the interface to the emulated SPARC system.
- Use Charon Manager to set the MAC address of the emulated SPARC system to the same value as the one used on the host system Ethernet interface.
- On the Solaris system, configure the private IP address that was previously assigned to the second interface on Linux.
- Additional steps may be required:
- If the primary interface has an automatically assigned IP address, this will be released after the first network restart with two interfaceswhen the instance is stopped and restarted. Hence the configuration must be changed to use a persistent Elastic IP address first to maintain reachability of the host system.
- If both the primary and the second interface only have private IP addresses or both interfaces have public addresses (Elastic IP) assigned, separate routing tables must be created for both interfaces Separate routing tables and routing rules may have to be created to enable proper routing for both interfaces.
The section Example of a More Complex Network Configuration provides some hints on how to configure the second interface in the different situations. Please refer to the AWS documentation for up-to-date comprehensive information.
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