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What is id option. I have no idea what it is and there are no results about it. For example from Arch Linux wiki

qemu-system-x86_64 -nic user,id=nic0,smb=shared_dir_path disk_image

What is id=nic0 and where do I get it?

Balora
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  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Apr 09 '23 at 18:23

1 Answers1

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You don’t get it, you set it. As per QEMU documentation:

-nic [tap|bridge|user|l2tpv3|vde|netmap|vhost-user|socket][,...][,mac=macaddr][,model=mn]
This option is a shortcut for configuring both the on-board (default) guest NIC hardware and the host network backend in one go. […]

The following two example do exactly the same, to show how -nic can be used to shorten the command line length:

qemu-system-x86_64 -netdev user,id=n1,ipv6=off -device e1000,netdev=n1,mac=52:54:98:76:54:32
qemu-system-x86_64 -nic user,ipv6=off,model=e1000,mac=52:54:98:76:54:32

From the “expanded” example you can see where the id= goes.

On -netdev, id= means:

Assign symbolic name for use in monitor commands.

On -device, the network card is assigned a network backend by specifying its ID in the netdev= option.

So there are two answers:

  • It’s used when using the QEMU Monitor
  • It’s used to connect network frontend and backend

With -nic, specifying an ID is optional, it will be generated for you if it’s missing.

Daniel B
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