Vagrant private networks allow you to access your guest machine by some address that is not publicly accessible from the global internet. In general, this means your machine gets an address in the private address space.
Multiple machines within the same private network (also usually with the restriction that they're backed by the same provider) can communicate with each other on private networks.
Guest operating system support. Private networks generally require configuring the network adapters on the guest machine. This process varies from OS to OS. Vagrant ships with knowledge of how to configure networks on a variety of guest operating systems, but it is possible if you are using a particularly old or new operating system that private networks will not properly configure.
The easiest way to use a private network is to allow the IP to be assigned via DHCP.
Vagrant.configure("2") do |config| config.vm.network "private_network", type: "dhcp" end
This will automatically assign an IP address from the reserved address space. The IP address can be determined by using
vagrant ssh to SSH into the machine and using the appropriate command line tool to find the IP, such as
You can also specify a static IP address for the machine. This lets you access the Vagrant managed machine using a static, known IP. The Vagrantfile for a static IP looks like this:
Vagrant.configure("2") do |config| config.vm.network "private_network", ip: "192.168.50.4" end
It is up to the users to make sure that the static IP does not collide with any other machines on the same network.
While you can choose any IP you would like, you should use an IP from the reserved private address space. These IPs are guaranteed to never be publicly routable, and most routers actually block traffic from going to them from the outside world.
For some operating systems, additional configuration options for the static IP address are available such as setting the default gateway or MTU.
Warning! Do not choose an IP that overlaps with any other IP space on your system. This can cause the network to not be reachable.
You can specify a static IP via IPv6. DHCP for IPv6 is not supported. To use IPv6, just specify an IPv6 address as the IP:
Vagrant.configure("2") do |config| config.vm.network "private_network", ip: "fde4:8dba:82e1::c4" end
This will assign that IP to the machine. The entire
/64 subnet will be reserved. Please make sure to use the reserved local addresses approved for IPv6.
You can also modify the prefix length by changing the
netmask option (defaults to 64):
Vagrant.configure("2") do |config| config.vm.network "private_network", ip: "fde4:8dba:82e1::c4", netmask: "96" end
IPv6 supports for private networks was added in Vagrant 1.7.5 and may not work with every provider.
If you want to manually configure the network interface yourself, you can disable Vagrant's auto-configure feature by specifying
Vagrant.configure("2") do |config| config.vm.network "private_network", ip: "192.168.50.4", auto_config: false end
If you already started the Vagrant environment before setting
auto_config, the files it initially placed there will stay there. You will have to remove those files manually or destroy and recreate the machine.
The files created by Vagrant depend on the OS. For example, for many Linux distros, this is
/etc/network/interfaces. In general you should look in the normal location that network interfaces are configured for your distro.
© 2010–2017 Mitchell Hashimoto
Licensed under the MPL 2.0 License.