Global network set
A global network set resource (GlobalNetworkSet) represents an arbitrary set of IP subnetworks/CIDRs, allowing it to be matched by Calico policy. Network sets are useful for applying policy to traffic coming from (or going to) external, non-Calico, networks.
The metadata for each network set includes a set of labels. When Calico is calculating the set of IPs that should match a source/destination selector within a global network policy rule, it includes the CIDRs from any network sets that match the selector.
Important: Since Calico matches packets based on their source/destination IP addresses, Calico rules may not behave as expected if there is NAT between the Calico-enabled node and the networks listed in a network set. For example, in Kubernetes, incoming traffic via a service IP is typically SNATed by the kube-proxy before reaching the destination host so Calico’s workload policy will see the kube-proxy’s host’s IP as the source instead of the real source.
apiVersion: projectcalico.org/v3 kind: GlobalNetworkSet metadata: name: a-name-for-the-set labels: role: external-database spec: nets: - 198.51.100.0/28 - 203.0.113.0/24
Global network set definition
|name||The name of this network set.||Lower-case alphanumeric with optional
|labels||A set of labels to apply to this endpoint.||map|
|nets||The IP networks/CIDRs to include in the set.||Valid IPv4 or IPv6 CIDRs, for example “192.0.2.128/25”||list|