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do not support Jumbo frames. For physical interfaces, this feature must be disabled in the emulator configuration (together with any other offloading parameters) using the initialize_command parameter.

Considerations for Cloud Environments

Every cloud environment has specific characteristics that could conflict with the interface configurations made for Charon-PAR. Please refer to the documentation provided by the cloud provider and the network-specific sections in the Getting Started Guide of your cloud-specific product to understand the networking behavior of your cloud instance before you change any interface settings.

Important points that apply to most cloud environments:

• If the Charon host is configured with more than one active IP interface, asymmetric routing can cause connectivity problems. In such cases, policy-based routing (per interface routing tables with associated IP rules) is required.

• Only IP unicast traffic is supported. Non-IP traffic or multicast/broadcast traffic is not supported and requires traffic tunneling.

• Promiscuous interface mode is not supported.
• Only traffic with the MAC address assigned by the cloud provider is allowed across an interface.

• Routing requires special configuration steps (source/destination check disabling) on the cloud instances. Enabling IP forwarding on the Linux host is not enough.

• Cloud specific security rules must allow the relevant traffic. Configuring the Linux firewall correctly is not enough.

• If a host NIC is dedicated to a guest system, the MAC address and IP address assigned to the interface by the cloud provider must be used by the guest.

Basic Configuration Components

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