NewL3Segment creates a new L3Segment.

SetFilterForwardPolicies sets the default policy for the FORWARD chain in the filter tables for both IPv4 and IPv6.

CurrentNetns can be passed to L3Segment.AddHost to indicate that the host lives in the current network namespace (eg.

L3Segment simulates a switched, dual-stack capable network that interconnects multiple hosts running in their own network namespace.