fix ip range for eth1

howto/ganeti.md

@@ -1067,7 +1067,7 @@ address blocks reserved in the cluster.
 
         auto eth1
         iface eth1 inet static
-            address 172.30.130.1
+            address 172.30.130.1/24
 
     This IP must be allocated in the reverse DNS zone file
     (`30.172.in-addr.arpa`) and the `torproject.org` zone file in