doc(README): requirements and network diagram

README.md

@@ -1,14 +1,38 @@
 # linux_ws2122 - Ansible
 
-Setup gateway and client vm via ansible.
+Setup gateway and client vm via Ansible. A DHCP and DNS server is installed on
+the gateway VM. Issued DHCP leases are transmitted via DDNS as forward and
+reverse entry of the zone `linuxws2122.de`.
 
-- Adapt IP-Addresses of the client and gateway VM in `host_vars`.
+## Requirements
-- Adapt name of the interfaces for booth VMs in `host_vars`.
+
+Requirements or individual adaptations to be able to run the Ansible Playbook:
+
+- Two Fedora 34 VMs are needed (gateway and client). Both receive a network
+  interface, which are connected to the subnet of the domestic router via the
+  network bridge `br0` of the host system in order to receive an IP address of the
+  router. This connection is shown in the network diagram with the colour `orange`.
+
+  In addition, both VMs receive a second network interface for internal
+  communication. The connection is shown in the network diagram in the colour
+  grey.
+
+- Adapt IP-Addresses of the client and gateway VM in `host_vars`, if the
+  IP-Addresses are not equal with the pre-defined ones.
+- Adapt name of the interfaces for booth VMs in `host_vars`, if the names of the
+  interface are not equal with the pre-defined ones.
 - Configure your Router (Fritz!Box, SpeedPort, ect) to route traffic for
   `192.168.181.0/24` via `gateway`.
-- Restart VMs after running the playbook
+- Enable password root login with SSH. Set password in `group_vars/all/ansible.yaml`.
+- Restart VMs after running the playbook.
+
+## Running the Playbooks
 
 ```bash
 ansible-playbook -i hosts.yaml gateway.linuxws2122.de.yaml
 ansible-playbook -i hosts.yaml client.linuxws2122.de.yaml
 ```
+
+## Network diagram
+
+![network-diagram](./png/network.png)