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Lukas Kalbertodt e86edb583e [DOCS] Add note about automatic internet to networking.md

So I wasted 1,5 hours trying to make bridged networking work just
to get internet access in MacOS. I thought I didn't have internet in
the VM because I tried to `ping 1.1.1.1`. Hopefully this note can
help future users not to waste their time, too.

2019-10-13 02:13:55 -04:00

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Guide to Bridged Networking

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.

To set up bridged networking for the macOS VM, use one of the following methods:

Using /etc/network/interfaces

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.

auto br0
iface br0 inet dhcp
  bridge_ports DEVICENAME tap0

auto tap0
iface tap0 inet dhcp
  pre-up tunctl -u MYUSERNAME -t tap0

Using NetworkManager

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.

Make the Bridge

nmcli connection add type bridge \
    ifname br1 con-name mybridge

Attach Bridge to Ethernet

nmcli connection add type bridge-slave \
    ifname DEVICENAME con-name mynetwork master br1

Make the Tun/Tap

nmcli connection add type tun \
    ifname tap0 con-name mytap \
    mode tap owner `id -u`

Attach Tun/Tap to Bridge

nmcli connection mod mytap connection.slave-type bridge \
    connection.master br1

Attach Bridge to QEMU

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.

    -netdev tap,id=net0,ifname=tap0,script=no,downscript=no \

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.

    -device vmxnet3,netdev=net0,id=net0,mac=52:54:00:c9:18:27 \

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