return net.Interfaces()
}

// getAllDefaultRoutes obtains IPv4 and IPv6 default routes on the node. If unable
// to read the IPv4 routing info file, we return an error. If unable to read the IPv6
// routing info file (which is optional), we'll just use the IPv4 route information.
// Using all the routing info, if no default routes are found, an error is returned.
func getAllDefaultRoutes() ([]Route, error) {
	routes, err := v4File.extract()

	defer func() { v4File.name = ipv4RouteFile }()

	// Should not occur, as caller ensures we have IPv4 route file, but being thorough
	v4File.name = "no-such-file"
	errStrFrag := "no such file"
	_, err := getAllDefaultRoutes()
	if err == nil {
		t.Errorf("Expected error trying to read non-existent v4 route file")
	}
	if !strings.Contains(err.Error(), errStrFrag) {