+ DHCP: step-by-step guide for test setup with Virtual Box

dhcpd/README.md

@@ -0,0 +1,53 @@
+# DHCP server
+
+Contents:
+* [Test setup with Virtual Box](#vbox)
+
+<a id="vbox"></a>
+## Test setup with Virtual Box
+
+To set up a test environment for DHCP server you need:
+
+* Linux host machine
+* Virtual Box
+* Virtual machine (guest OS doesn't matter)
+
+### Configure client
+
+1. Install Virtual Box and run the following command to create a Host-Only network:
+
+        $ VBoxManage hostonlyif create
+
+    You can check its status by `ip a` command.
+
+    You can also set up Host-Only network using Virtual Box menu:
+
+        File -> Host Network Manager...
+
+2. Create your virtual machine and set up its network:
+
+        VM Settings -> Network -> Host-only Adapter
+
+3. Start your VM, install an OS.  Configure your network interface to use DHCP and the OS should ask for a IP address from our DHCP server.
+
+### Configure server
+
+1. Edit server configuration file 'AdGuardHome.yaml', for example:
+
+        dhcp:
+          enabled: true
+          interface_name: vboxnet0
+          gateway_ip: 192.168.56.1
+          subnet_mask: 255.255.255.0
+          range_start: 192.168.56.2
+          range_end: 192.168.56.2
+          lease_duration: 86400
+          icmp_timeout_msec: 1000
+
+2. Start the server
+
+        ./AdGuardHome
+
+    There should be a message in log which shows that DHCP server is ready:
+
+        [info] DHCP: listening on 0.0.0.0:67