LIST natpf rules in Virtualbox/Vagrant

Question

I often get errors like this when running Vagrant:

VBoxManage: error: A NAT rule of this name already exists
VBoxManage: error: Details: code NS_ERROR_INVALID_AR         


        

Answer 1

I came here with the same problem; with your hint about deleting the rule I found that you can use the VirtualBox GUI to find the rules and delete them.

Of course, this only works when you are working on a machine with a GUI desktop.

• Open the VirtualBox manager
• Open the settings for the box in question (rmb -> settings, or the gear icon)
• Select Network from the list on the left and open the Port Forwarding dialogue

From here you'll be able to directly remove the rules.

http://i.stack.imgur.com/6fQQc.png

---

Looking at the rules, it seems they just get a name that is equal to the port being set. So you can also look at the Vagrantfile, and search for a line like this:

db.vm.network :forwarded_port, guest: 5432, host: 5432

And guess that the name of the rule will be 5432. The name of the rule for forwarding the ssh port 22, is called ssh

$ vboxmanage modifyvm "vbox-id" --natpf1 delete "5432"

Answer 2

You can delete a rule from the command line by issuing:

VBoxManage controlvm "boot2docker-vm" natpf1 delete "tcp-port80"

the last parameter in quotes is the rule name you wish to delete.

Answer 3

This got the job done for me:

VBoxManage showvminfo $VM_NAME --machinereadable | awk -F '[",]' '/^Forwarding/ { printf ("Rule %s host port %d forwards to guest port %d\n", $2, $5, $7); }'

Answer 4

Expanding on Andrew's answer, this lists the rules for all your VMs

for vm in `vboxmanage list vms | awk -F'"' '$0=$2'`
do
    echo "Rules for VM $vm"
    VBoxManage showvminfo $vm --machinereadable | awk -F '[",]' '/^Forwarding/ { printf ("Rule %s host port %-5d forwards to guest port %-5d\n", $2, $5, $7); }'
    printf '\n'
done

Answer 5

You can list the nat rules by the following command:

VBoxManage showvminfo #{vmid}

You then get a lot of information about your VM including the forwarding rules, for example:

NIC 1 Rule(1):   name = ssh, protocol = tcp, host ip = 127.0.0.1, host port = 2022, guest ip = , guest port = 22