Nutanix AHV must protect against or limit the effects of denial-of-service (DoS) attacks by ensuring the operating system is implementing rate-limiting measures on impacted network interfaces.

DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity.

This requirement addresses the configuration of the operating system to mitigate the impact of DoS attacks that have occurred or are ongoing on system availability. For each system, known and potential DoS attacks must be identified and solutions for each type implemented. A variety of technologies exist to limit or, in some cases, eliminate the effects of DoS attacks (e.g., limiting processes or establishing memory partitions). Employing increased capacity and bandwidth, combined with service redundancy, may reduce the susceptibility to some DoS attacks.

For AOS, Prism Central, and Files, this requirement is Not Applicable.

Verify "firewalld" has "nftables" set as the default backend using the following command.

$ sudo grep -i firewallbackend /etc/firewalld/firewalld.conf

# FirewallBackend FirewallBackend=nftables

If the "nftables" is not set as the "firewallbackend" default, this is a finding.

Configure Nutanix AHV firewall services using the following command.

$ sudo salt-call state.sls security/KVM/iptablesKVM