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I have a real machine without network, i want to create network between virtual box and my real machine. Also i have a COM Device i want to control them from virtual box, what i need to select in com device mode setting?

For a host-guest simulated network connection use "Host Only" network mode.

For the comm port, just enable it in the VM settings and associate it with a selected host comm port. It will be visible in the guest as COM1 unless you change the defaults.

See user manual for details on both.