mirror of https://github.com/kholia/OSX-KVM.git
99 lines
3.8 KiB
Plaintext
99 lines
3.8 KiB
Plaintext
There are two main ways to set up networking on OS X / macOS, as it does not
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function with what QEMU defaults to for network settings:
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-----------------------------------
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User Mode Networking (Easier Setup)
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-----------------------------------
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By default, QEMU uses user mode networking (SLiRP). This networking mode is the
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slowest and is not visible via the outside network, but requires no host-side
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setup, so it's perfect if you just want internet but don't care about latency
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or about connecting to the VM from an external source.
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In order to do this, change the line in your qemu-system-x86_64 command (found
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in boot-macOS.sh) to the following:
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-netdev user,id=net0 -device network_adapter,netdev=net0,id=net0,mac=52:54:00:c9:18:27 \
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Once you set network_adapter to the preferred adapter, no further setup is required; your
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internet should Just Werk™ in your virtual machine!
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For further information on detailed configuration options, see QEMU's
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documentation on networking ( http://wiki.qemu.org/Documentation/Networking )
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Here is the list of network adapters supported by macOS,
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e1000-82545em - The problem that we run into here is that OS X is nitpicky
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about what emulated networking devices it is willing to accept. The
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e1000-82545em is a known adapter that can be used on pretty much any version of
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MacOS.
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To use this adapter, replace network_adapter with e1000-82545em
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vmxnet3 - An alternative solution to e1000 is to use vmxnet3 instead. Unlike
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the e1000, vmxnet3 is a paravirtualized NIC, which can allow for better
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performance (in theory). The only catch is that the you need to have a recent
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version of MacOS (10.11 or later).
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To use this adapter, replace network_adapter with vmxnet3
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-----------------------------------
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Tap Networking (Better Performance)
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-----------------------------------
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Installing "virt-manager" automagically creates the "virbr0" local private bridge :-)
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sudo apt-get install uml-utilities virt-manager
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sudo ip tuntap add dev tap0 mode tap
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sudo ip link set tap0 up promisc on
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sudo brctl addif virbr0 tap0
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sudo ip link set dev virbr0 up # as needed
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sudo ip link set dev tap0 master virbr0
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Note: If `virbr0` network interface is not present on your system, it may
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have been deactivated. Try enabling it by using the following commands,
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virsh net-start default
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virsh net-autostart default
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Add "-netdev tap,id=net0,ifname=tap0,script=no,downscript=no -device e1000-82545em,netdev=net0,id=net0,mac=52:54:00:c9:18:27 \"
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to your qemu-system-x86_64 command.
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QEMU networking tip
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-------------------
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# printf '52:54:00:AB:%02X:%02X\n' $((RANDOM%256)) $((RANDOM%256)) # generates QEMU compatible mac addresses!
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------------------
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Bridged Networking
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------------------
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QEMU defaults to using NAT for its guests. It has a built-in DHCP server that
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provides addresses from the 192.168.12x.0 subnet. However, this configuration
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makes file sharing, printer sharing, and other common networking activities
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harder to use in a home network.
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Bridged networking allows your QEMU guest to get an address on the same subnet
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as the host computer. For example, many home networks let the wireless router
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handle IP assignment via DHCP. Here are the steps for setting up the bridge.
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To setup bridged networking from the command line, refer to this documentation
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at the Ubuntu website. https://help.ubuntu.com/community/KVM/Networking
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Ultimately, the script for booting the QEMU guest will need a line similar to
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the following to enable bridged networking in the guest:
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-netdev bridge,id=net0,br=virbr0,"helper=/usr/lib/qemu/qemu-bridge-helper"
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On some systems the `qemu-bridge-helper` file has incorrect permissions. For it
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to work, it needs to be setuid root. This can be accomplished with this command:
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$ sudo chmod u+s /usr/lib/qemu/qemu-bridge-helper
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Note that this is sometimes viewed as a security hole. Be careful and understand
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what you are doing before running this command.
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