diff --git a/INSTALL.md b/INSTALL.md
index 8d890e1..d52e741 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -25,6 +25,12 @@ As root:
 go get -v -u github.com/FreifunkBremen/yanic
 ```
 
+### allow to ping
+only needed if config has `nodes.ping_count` > 0
+```sh
+sudo setcap cap_net_raw=+ep  /opt/go/bin/yanic
+```
+
 #### Work with other databases
 If you like to use another database solution than influxdb, Pull Requests are
 welcome. Just fork this project and create another subpackage within the folder
diff --git a/docs/docs_install.md b/docs/docs_install.md
index 388eade..54a9b56 100644
--- a/docs/docs_install.md
+++ b/docs/docs_install.md
@@ -26,6 +26,12 @@ As root:
 go get -v -u github.com/FreifunkBremen/yanic
 ```
 
+### allow to ping
+only needed if config has `nodes.ping_count` > 0
+```sh
+sudo setcap cap_net_raw=+ep  /opt/go/bin/yanic
+```
+
 ### Install
 
 ```sh
diff --git a/runtime/node.go b/runtime/node.go
index 820c1ee..ee2a880 100644
--- a/runtime/node.go
+++ b/runtime/node.go
@@ -13,7 +13,7 @@ type Node struct {
 	Firstseen  jsontime.Time    `json:"firstseen"`
 	Lastseen   jsontime.Time    `json:"lastseen"`
 	Online     bool             `json:"online"`
-	NoRespondd bool             `json:"-"`
+	NoRespondd bool             `json:"no_respondd"`
 	Statistics *data.Statistics `json:"statistics"`
 	Nodeinfo   *data.NodeInfo   `json:"nodeinfo"`
 	Neighbours *data.Neighbours `json:"-"`
diff --git a/runtime/nodes.go b/runtime/nodes.go
index 4b41d42..77de315 100644
--- a/runtime/nodes.go
+++ b/runtime/nodes.go
@@ -80,9 +80,10 @@ func (nodes *Nodes) Update(nodeID string, res *data.ResponseData) *Node {
 	// Update fields
 	node.Lastseen = now
 	node.Online = true
-	node.Neighbours = res.Neighbours
 	node.Nodeinfo = res.NodeInfo
 	node.Statistics = res.Statistics
+	node.Neighbours = res.Neighbours
+	node.NoRespondd = res.Statistics == nil && res.Neighbours == nil
 
 	return node
 }
@@ -170,24 +171,32 @@ func (nodes *Nodes) expire() {
 	nodes.Lock()
 	defer nodes.Unlock()
 
+	wg := sync.WaitGroup{}
+
 	for id, node := range nodes.List {
 		if node.Lastseen.Before(pruneAfter) {
 			// expire
 			delete(nodes.List, id)
 		} else if node.Lastseen.Before(offlineAfter) {
 			// set to offline
-			if nodes.config.PingCount > 0 && nodes.ping(node) {
-				node.Online = true
-				node.NoRespondd = true
+			wg.Add(1)
+			go func(node *Node) {
+				defer wg.Done()
+				if nodes.config.PingCount > 0 && nodes.ping(node) {
+					node.Online = true
+					node.NoRespondd = true
 
-				node.Statistics = nil
-				node.Neighbours = nil
-			} else {
-				node.Online = false
-				node.NoRespondd = false
-			}
+					node.Statistics = nil
+					node.Neighbours = nil
+				} else {
+					node.Online = false
+					node.NoRespondd = false
+				}
+			}(node)
 		}
 	}
+	wg.Wait()
+	log.WithField("nodes", "expire").Debug("end")
 }
 
 // adds the nodes interface addresses to the internal map
@@ -249,6 +258,7 @@ func (nodes *Nodes) save() {
 
 	// serialize nodes
 	SaveJSON(nodes, nodes.config.StatePath)
+	log.WithField("nodes", "save").Debug("end")
 }
 
 // SaveJSON to path
diff --git a/runtime/nodes_ping.go b/runtime/nodes_ping.go
index d5f7e53..9198178 100644
--- a/runtime/nodes_ping.go
+++ b/runtime/nodes_ping.go
@@ -10,13 +10,21 @@ func (nodes *Nodes) ping(node *Node) bool {
 	if node.Nodeinfo != nil {
 		logNode = logNode.WithField("node_id", node.Nodeinfo.NodeID)
 	}
-	if node.Address == nil {
+	var addr string
+	if node.Address != nil {
+		addr = node.Address.IP.String()
+		if node.Address.IP.IsLinkLocalUnicast() {
+			addr += "%" + node.Address.Zone
+		}
+	} else {
 		logNode.Debug("error no address found")
-		return false
-	}
-	addr := node.Address.IP.String()
-	if node.Address.IP.IsLinkLocalUnicast() {
-		addr += "%" + node.Address.Zone
+		if node.Nodeinfo != nil {
+			for _, addrMaybe := range node.Nodeinfo.Network.Addresses {
+				if len(addrMaybe) >= 5 && addrMaybe[:5] != "fe80:" {
+					addr = addrMaybe
+				}
+			}
+		}
 	}
 
 	logAddr := logNode.WithField("addr", addr)
@@ -26,9 +34,10 @@ func (nodes *Nodes) ping(node *Node) bool {
 		logAddr.Debugf("error during ping: %s", err)
 		return false
 	}
-	//pinger.SetPrivileged(true)
+	pinger.SetPrivileged(true)
 	pinger.Count = nodes.config.PingCount
 	pinger.Timeout = nodes.config.PingTimeout.Duration
+	pinger.Interval =  pinger.Timeout / pinger.Count
 	pinger.Run() // blocks until finished
 	stats := pinger.Statistics()
 	logAddr.WithFields(map[string]interface{}{
diff --git a/runtime/nodes_ping_test.go b/runtime/nodes_ping_test.go
index 170f4d1..23f43a2 100644
--- a/runtime/nodes_ping_test.go
+++ b/runtime/nodes_ping_test.go
@@ -27,7 +27,13 @@ func TestPing(t *testing.T) {
 		ifaceToNodeID: make(map[string]string),
 	}
 
-	node := nodes.Update("expire", &data.ResponseData{NodeInfo: &data.NodeInfo{NodeID: "nodeID-Lola"}})
+	node := nodes.Update("expire", &data.ResponseData{NodeInfo: &data.NodeInfo{
+		NodeID:  "nodeID-Lola",
+		Network: data.Network{Addresses: []string{"fe80::1", "fd2f::1"}},
+	}})
+	// get fallback
+	assert.False(nodes.ping(node))
+
 	node.Address = &net.UDPAddr{Zone: "bat0"}
 	// error during ping
 	assert.False(nodes.ping(node))