OK, strange question. I have SSH forwarding working with Vagrant. But I\'m trying to get it working when using Ansible as a Vagrant provisioner.
I found out exactly what
Here's a workaround:
Create an ansible.cfg file in the same directory as your Vagrantfile with the following lines:
ansible.cfg
[ssh_connection] ssh_args = -o ControlMaster=auto -o ControlPersist=60s -o ForwardAgent=yes