VirtualBox has a bug where the IPv6 route is lost on every other
configuration of a host-only network. This is also triggered when a VM
is booted.
To fix this, we test the route-ability of all IPv6 networks, and
reconfigure if necessary. This is very fast but we still only do this if
we have any IPv6 networks.
This change allows you to specify multiple network interfaces to bridge
to, picking the first found.
```ruby
config.vm.network "public_network",
bridge: ["en4: Thunderbolt Ethernet",
"en6: Broadcom NetXtreme Gigabit Ethernet Controller",
"en0: Wi-Fi (AirPort)"]
```
fixes#3083
Detect the presence of the default DHCP server that comes in a fresh
VirtualBox install and clean it up to prevent it from colliding with
Vagrant-managed network config.
In order to accomplish this, we:
- add a `remove_dhcp_server` call to the virtualbox driver
- fix dhcp options parsing to allow `:dhcp_{ip,lower,upper}`
configuration options to make it through (so a user can override the
removal behavior with some explicit configuration)
- add the full `:network_name` to the details returned from
`:read_dhcp_servers`, so we can have a durable value to pass to
`:remove_dhcp_server`
Note that we do have to eat one more `VBoxManage list dhcpservers` for
each network interface to support this, but this seemed like a nominal
cost
This is just a refactor, no behavior change.
Instead of stitching together dhcpserver info in the structure returned
from `read_host_only_interfaces`, sprout a new driver method called
`read_dhcp_servers` to return that information separately.
This means that driver clients (well there's really only _one_ client in
`ProviderVirtualBox::Action::Network`) have to do a bit more work to get
interface and DHCP server information.
But this gives us (a) a cleaner and more consistent driver interface and
(b) groundwork for a fix for #3083, which will require interacting with
DHCP servers outside of the context of host-only interfaces.
