Multiple NICs in a Vagrant machine

README.md

With this Vagrantfile, you will have a Vagrant VM with three NICs. Vagrant uses eth0 for NAT'ing the guest to the outside world. (I do not know a way to override this. Vagrant is very unhappy with eth0 being the NAT interface.) eth1 and eth2 will be on separate virtual subnets available only between the host and the guest.

ifconfig-on-host

vboxnet2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
  ether 0a:00:27:00:00:02
  inet 192.168.33.1 netmask 0xffffff00 broadcast 192.168.33.255
vboxnet3: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
  ether 0a:00:27:00:00:03
  inet 10.33.33.1 netmask 0xffffff00 broadcast 10.33.33.255

ifconfig-on-VM

vagrant@precise64:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 08:00:27:88:0c:a6
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe88:ca6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:438 errors:0 dropped:0 overruns:0 frame:0
          TX packets:352 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:47045 (47.0 KB)  TX bytes:40380 (40.3 KB)

eth1      Link encap:Ethernet  HWaddr 08:00:27:5c:f7:79
          inet addr:192.168.33.10  Bcast:192.168.33.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe5c:f779/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:656 (656.0 B)  TX bytes:578 (578.0 B)

eth2      Link encap:Ethernet  HWaddr 08:00:27:9f:b1:3a
          inet addr:10.33.33.10  Bcast:10.33.33.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe9f:b13a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:656 (656.0 B)  TX bytes:468 (468.0 B)

Vagrantfile

Vagrant::Config.run do |config|
  config.vm.box = "precise64"
  config.vm.box_url = 'http://files.vagrantup.com/precise64.box'

  # Assign this VM to a host-only network IP, allowing you to access it
  # via the IP. Host-only networks can talk to the host machine as well as
  # any other machines on the same network, but cannot be accessed (through this
  # network interface) by any external networks.
  config.vm.network :hostonly, "192.168.33.10"
  config.vm.network :hostonly, "10.33.33.10"
end