SetupCrossNsDNAT sets up a network namespace, named "test", along with two IP addresses 2.2.2.3 and 2.2.2.4 to be used for namespace aware tests.

SetupDNAT sets up a NAT translation from 2.2.2.2 to 1.1.1.1.

SetupDNAT6 sets up a NAT translation from fd00::2 to fd00::1.

TeardownCrossNsDNAT cleans up the resources created by SetupCrossNsDNAT.

TeardownDNAT cleans up the resources created by SetupDNAT.

TeardownDNAT6 cleans up the resources created by SetupDNAT6.