update readme

README.md

@@ -1,5 +1,7 @@
-# wanmonitor
-WAN Monitor & Failover Connection Manager
+# WAN Monitor & Failover Connection Manager
+
+
+# Configuration
 
 All configuration is done in /etc/config/wanmonitor file. Options available:
 * check_host - IP address of remote host used to check Internet connectivity
@@ -8,4 +10,36 @@ All configuration is done in /etc/config/wanmonitor file. Options available:
 * wan_primary - Primary WAN interface name to use
 * wan_secondary - Secondary WAN interface name to use
 
-In order to work this software correctly it is recommended to disable default routes on all WAN interfaces.
+What is more it can make a use of WAN routes metrics set in /etc/config/network,
+thus allowing to use PPPoE to work correctly. When PPPoE connection is established,
+it automatically adds a route with proper (higher) priority and this connection
+is being used as default. After a while, when WanMonitor notices primary connection
+is again available, it removes a route for secondary WAN connection (eg. in order to
+save mobile traffic).
+
+
+# Sample configuration
+
+/etc/config/network:
+<pre>config interface 'wan1'
+        option ifname 'eth0'
+        option metric '0'
+        option proto 'pppoe'
+        option username 'login'
+        option password 'password'
+        option service 'PPPoE'
+
+config interface 'wan2'
+        option ifname 'eth1'
+        option proto 'dhcp'
+        option metric '5'
+        option defaultroute '0'
+        option service 'LTE'</pre>
+
+/etc/config/wanmonitor:
+<pre>config wanmonitor
+        option check_host '8.8.8.8'
+        option interval '5'
+        option sleep '5'
+        option wan_primary 'wan1'
+        option wan_secondary 'wan2'</pre>