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It's also possible to let QEMU control your tun/tap devices. It's only needed to create a bridge device with f.e. netctl.
91 lines
2.8 KiB
Markdown
91 lines
2.8 KiB
Markdown
Guide to Bridged Networking
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===========================
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*Note*: you don't need to set up bridged networking just to get internet access. With `basic.sh` you should be able to access the internet from MacOS automatically. *However*, the ICMP protocol (used for `ping`) is not supported with the default networking solution.
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To set up bridged networking for the macOS VM, use one of the following methods:
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## Using /etc/network/interfaces
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It is possible to create the bridge and tun/tap interfaces by adding the following lines to `/etc/network/interfaces`. Replace `DEVICENAME` with your ethernet card's device name, and `MYUSERNAME` with the user that is starting the VM.
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```
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auto br0
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iface br0 inet dhcp
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bridge_ports DEVICENAME tap0
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auto tap0
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iface tap0 inet dhcp
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pre-up tunctl -u MYUSERNAME -t tap0
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```
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## Using NetworkManager
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You can use NetworkManager to control the bridge and tun/tap interfaces, by creating them with the following commands. Replace `DEVICENAME` with your ethernet card's device name.
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### Make the Bridge
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```
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nmcli connection add type bridge \
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ifname br1 con-name mybridge
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```
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### Attach Bridge to Ethernet
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```
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nmcli connection add type bridge-slave \
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ifname DEVICENAME con-name mynetwork master br1
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```
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### Make the Tun/Tap
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```
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nmcli connection add type tun \
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ifname tap0 con-name mytap \
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mode tap owner `id -u`
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```
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### Attach Tun/Tap to Bridge
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```
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nmcli connection mod mytap connection.slave-type bridge \
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connection.master br1
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```
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## Attach Bridge to QEMU
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Once you have set up the bridge and tun/tap on the host, you'll have to add the following line to `basic.sh`, replacing `-netdev user,id=net0`. Change `tap0` to your corresponding device name.
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```
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-netdev tap,id=net0,ifname=tap0,script=no,downscript=no \
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```
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You can optionally use the `vmxnet3` driver for higher performance compared to the default e1000. Note that replacing it requires macOS El Capitan or higher.
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```
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-device vmxnet3,netdev=net0,id=net0,mac=52:54:00:c9:18:27 \
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```
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## Using Netctl
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You can also use netctl and the qemu bridge helper to control the bridge and tun/tap interfaces. Replace `DEVICENAME` with your ethernet card's device name.
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### Create netctl configuration file in /etc/netctl (f.e. /etc/netctl/kvm-bridge)
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```
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Description="Bridge Interface br10 : DEVICENAME"
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Interface=br10
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Connection=bridge
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BindsToInterfaces=(DEVICENAME)
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IP=dhcp
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# If you want also for DHCPv6,uncomment below line
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#IP6=dhcp
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```
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### Activate netctl bridge handler with system boot
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```
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sudo netctl enable kvm-bridge
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```
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### Create bridge whitelist file for qemu (/etc/qemu/bridge.conf)
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```
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allow br10
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```
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## Attach Bridge to QEMU
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Now you'll have to add the following line to `basic.sh`, replacing `-netdev user,id=net0`. Change `br10` to your corresponding device name.
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```
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-netdev bridge,br=br10,id=net0 \
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```
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