Migration is secure using SSH tunnel by default. For secure private networks you can disable it to speed up migration. Deprecated, use the 'migration' property instead!
+`next-id`: `[lower=<integer>] [,upper=<integer>]` ::
+
+Control the range for the free VMID auto-selection pool.
+
+`lower`=`<integer>` ('default =' `100`);;
+
+Lower, inclusive boundary for free next-id API range.
+
+`upper`=`<integer>` ('default =' `1000000`);;
+
+Upper, inclusive boundary for free next-id API range.
+
`u2f`: `[appid=<APPID>] [,origin=<URL>]` ::
u2f