Unreachable vagrant boxes

Currently having issue with running my ansible playbook after running vagrant up.

Here's my Vagrant file:

```
# -*- mode: ruby -*-
# vi: set ft=ruby :

VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
# General Vagrant VM configuration.
config.vm.box = "geerlingguy/centos8"
config.ssh.insert_key = false
config.vm.synced_folder ".", "/vagrant", disabled: true
config.vm.provider :virtualbox do |v|
v.memory = 512
v.linked_clone = true
end

# Application server 1.
config.vm.define "app1" do |app|
app.vm.hostname = "orc-app1.test"
app.vm.network :private_network, ip: "192.168.60.4"
end

# Application server 2.
config.vm.define "app2" do |app|
app.vm.hostname = "orc-app2.test"
app.vm.network :private_network, ip: "192.168.60.5"
end

# Database server.
config.vm.define "db" do |db|
db.vm.hostname = "orc-db.test"
db.vm.network :private_network, ip: "192.168.60.6"
end
end
```

Here's my hosts.ini file:

```
# Application servers
[app]
192.168.60.4
192.168.60.5

# Database server
[db]
192.168.60.6:2201

# Group 'multi' with all servers
[multi:children]
app
db

# Variables that will be applied to all servers
[multi:vars]
ansible_user=vagrant
ansible_ssh_private_key_file=~/.vagrant.d/insecure_private_key
```