diff --git a/api/aliases.go b/api/aliases.go
index 3550e1a..4ac0fa6 100644
--- a/api/aliases.go
+++ b/api/aliases.go
@@ -8,6 +8,18 @@ import (
 	"net/http"
 )
 
+// 7 nachkommerstellen sollten genug sein (7cm genau)
+// http://blog.3960.org/post/7309573249/genauigkeit-bei-geo-koordinaten
+
+const GEOROUND = 0.0000001
+
+func geoEqual(a, b float64) bool {
+	if (a-b) < GEOROUND && (b-a) < GEOROUND {
+		return true
+	}
+	return false
+}
+
 type ApiAliases struct {
 	aliases *models.Aliases
 	config  *models.Config
@@ -35,17 +47,34 @@ func (api *ApiAliases) cleaner() {
 			//counter for the diffrent attribute
 			count := 0
 			if nodeinfo := node.Nodeinfo; nodeinfo != nil {
-				count += 1
-				if alias.Hostname == nodeinfo.Hostname {
-					count -= 1
-				}
-				if alias.Location != nil && nodeinfo.Location != nil {
-					count += 2
-					if alias.Location.Latitude == nodeinfo.Location.Latitude {
+				if len(alias.Hostname) > 0 {
+					count += 1
+					if alias.Hostname == nodeinfo.Hostname {
 						count -= 1
+						alias.Hostname = ""
 					}
-					if alias.Location.Longtitude == nodeinfo.Location.Longtitude {
+				}
+				if len(alias.Owner) > 0 {
+					count += 1
+					if nodeinfo.Owner != nil && alias.Owner == nodeinfo.Owner.Contact {
 						count -= 1
+						alias.Owner = ""
+					}
+				}
+				if alias.Location != nil {
+					count += 2
+					if nodeinfo.Location != nil {
+						if geoEqual(alias.Location.Latitude, nodeinfo.Location.Latitude) {
+							count -= 1
+							if geoEqual(alias.Location.Longtitude, nodeinfo.Location.Longtitude) {
+								count -= 1
+								alias.Location = nil
+							}
+						} else {
+							if geoEqual(alias.Location.Longtitude, nodeinfo.Location.Longtitude) {
+								count -= 1
+							}
+						}
 					}
 				}
 				if nodeinfo.Wireless != nil && alias.Wireless != nil {
@@ -62,11 +91,16 @@ func (api *ApiAliases) cleaner() {
 					if alias.Wireless.TxPower5 == nodeinfo.Wireless.TxPower5 {
 						count -= 1
 					}
+					if alias.Wireless.Channel24 == nodeinfo.Wireless.Channel24 && alias.Wireless.TxPower24 == nodeinfo.Wireless.TxPower24 && alias.Wireless.Channel5 == nodeinfo.Wireless.Channel5 && alias.Wireless.TxPower5 == nodeinfo.Wireless.TxPower5 {
+						alias.Wireless = nil
+					}
 				}
 			}
+
 			//delete element
 			if count <= 0 {
 				delete(api.aliases.List, key)
+				fmt.Print("[api] node updated '", key, "'\n")
 			}
 		}
 	}
@@ -93,6 +127,7 @@ func (api *ApiAliases) SaveOne(w http.ResponseWriter, r *http.Request, ps httpro
 		return
 	}
 	api.aliases.Update(ps.ByName("nodeid"), &alias)
+	fmt.Print("[api] node updated '", ps.ByName("nodeid"), "'\n")
 	jsonOutput(w, r, alias)
 }
 
@@ -101,6 +136,7 @@ func (api *ApiAliases) Cleanup(w http.ResponseWriter, r *http.Request, _ httprou
 	jsonOutput(w, r, api.aliases.List)
 }
 func (api *ApiAliases) AnsibleDiff(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
+	fmt.Print("[api] ansible\n")
 	api.cleaner()
 	jsonOutput(w, r, models.GenerateAnsible(api.nodes, api.aliases.List))
 }
diff --git a/models/ansible.go b/models/ansible.go
index 4984813..f418c30 100644
--- a/models/ansible.go
+++ b/models/ansible.go
@@ -27,10 +27,12 @@ func GenerateAnsible(nodes *Nodes, aliases map[string]*Alias) *Ansible {
 			ansible.Nodes = append(ansible.Nodes, nodeid)
 
 			vars := &AnsibleHostVars{
-				Address:  node.Nodeinfo.Network.Addresses[0],
 				Hostname: alias.Hostname,
 				Owner:    alias.Owner,
 			}
+			if node.Nodeinfo.Network.Addresses != nil {
+				vars.Address = node.Nodeinfo.Network.Addresses[0]
+			}
 			if alias.Wireless != nil {
 				vars.Channel24 = alias.Wireless.Channel24
 				vars.TxPower24 = alias.Wireless.TxPower24