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Unable to Connect to Vagrant Guest VMs in a Private Network

I had a problem connecting to a vagrant virtualbox cluster from the host (OS X 10.10.4 Yosemite).

There are three hosts set up as a vagrant private_network, each having an assigned IP in the range 192.168.37.2 – 192.168.37.4

The virtual network I wanted to connect to (vboxnet0) had a status of Up and the hosts were running. I could connect with vagrant ssh to all of the hosts in the network, but I was unable to ping the virtual host from the host OS.

arp -a showed no entry for the virtual network (vboxnet0):

? (192.168.0.1) at 14:cc:20:4c:37:40 on en0 ifscope [ethernet]

? (192.168.0.100) at b8:e9:37:ec:1c:c4 on en0 ifscope [ethernet]

? (192.168.0.106) at 14:10:9f:de:62:e7 on en0 ifscope permanent [ethernet]

? (192.168.0.255) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet]

vboxmanage list hostonlyifs showed six other virtual networks setup, most with status Down, possibly from other vagrant installations

Running these steps fixed it:

  1. Shutdown all nodes with vagrant halt

  2. Remove all the virtual networks with vboxmanage hostonlyif remove vboxnet0 for every network returned by vboxmanage list hostonlyifs

  3. Recreate with vboxmanage hostonlyif create. This recreated the vboxnet0 network which was the only one I was interested in

  4. Recreate with vboxmanage hostonlyif ipconfig vboxnet0 –ip 192.168.37.1

This seems to reset the state, now I can connect to each of the hosts in the network.