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Ethernet Interface Preparation

Red Hat and CentOS Version 7.x

Even though it is not mandatory, it is good practice to exclude the Ethernet interfaces that will be used by the guest system running on Charon-PAR from being managed by the NetworkManager. 

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There are other settings required to disable certain off-load functions on interfaces dedicated to a Charon-PAR guest system. These settings are configured in the emulator configuration file and described further down in this document.

Red Hat and CentOS Version 8.x

Starting with CentOS/Red Hat/Oracle Linux 8.x, the network-scripts package has been deprecated and the bridge-utils package is no longer available in the standard repositories. Network management for these Linux versions has been changed to use the NetworkManager capabilities. Network management can be handled via the Gnome GUI or via nmcli commands. Please refer to the documentation of your Red Hat or CentOS version for more information.

The network-scripts package can be installed optionally to maintain the same network management methods as used in Linux version 7. However, there is no guarantee how long the package will still be available.

The following image shows a sample configuration that disables the IPv4 configuration for an interface that is to be dedicated to the emulator using the GNOME network settings (include the option to make the interface available to other users):

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You can use the following command to disable IPv6 for an interface (enp0s8 in the example):

# sysctl -w net.ipv6.conf.enp0s8.disable_ipv6=1

To make this setting permanent, add it to /etc/sysctl.conf.