diff --git a/docker-manage-network b/docker-manage-network
index 0b6635f..a5de14d 100755
--- a/docker-manage-network
+++ b/docker-manage-network
@@ -159,6 +159,10 @@ function create_device {
     ip link set dev $VETH0 up
     ip netns exec $NSDOCK ip link set dev $VETH1 name $DEVNAME
     ip netns exec $NSDOCK ip link set dev $DEVNAME up
+    ip netns exec $NSDOCK sysctl net.ipv6.conf.all.disable_ipv6=1
+    ip netns exec $NSDOCK sysctl net.ipv6.conf.default.disable_ipv6=1
+    ip netns exec $NSDOCK sysctl net.ipv6.conf.lo.disable_ipv6=1
+
     set +e
     log_debug "device $DEVNAME created in container $DOCKID \
         and attached to bridge $BRNAME"
@@ -244,18 +248,34 @@ function get_ip_dhcp {
 
     DOCKID=$1
     DEVNAME=$2
-    set +u
-    DHCP=$3
-    [ "$DHCP" == "" ] && DHCP=dhclient
-    set -u
+    PIDFILE=$3
 
     NSDOCK=$(build_ns $DOCKID)
     set -e
-    ip netns exec $NSDOCK dhclient $DEVNAME -nw
+    ip netns exec $NSDOCK dhclient $DEVNAME -nw -pf "$PIDFILE"
     set +e
     log_debug "dhcp client launched for device $DEVNAME in container $DOCKID"
 }
 
+function release_dhcp {
+    # 
+    # @Syntax: get_ip_dhcp $1 $2 $3 (default=dhclient) ]
+    #
+    # This function launches a dhcp client stated in $3 (optional parameter which defaults to dhclient) for device $2 in container $1
+    #   * NOTE: the current parameters for the dhcp client are only tested for dhclient.
+    #
+
+    DOCKID=$1
+    DEVNAME=$2
+    PIDFILE=$3
+
+    NSDOCK=$(build_ns $DOCKID)
+    set -e
+    ip netns exec $NSDOCK dhclient $DEVNAME -r -pf "$PIDFILE"
+    set +e
+    log_debug "dhcp client killed for device $DEVNAME in container $DOCKID"
+}
+
 function read_param {
     # 
     # @Syntax: read_param $1 $@
@@ -338,7 +358,9 @@ MACADDR=
 DHCP=no
 CLEAN_NAMESPACES=no
 GW=
+DHCPPIDFILE=
 
+RELEASEDHCP=False
 CREATE=False
 UPDATE=False
 DELETE=False
@@ -384,9 +406,16 @@ while [ $# -gt 0 ]; do
                         exit_on_error "missing parameter for --mac"
                         shift;;
     --ip|-i)                read_param IPADDR $@
-                        exit_on_error "missing paramter for --ip"
+                        exit_on_error "missing parameter for --ip"
+                        shift;;
+    --dhcp)             DHCP=yes
+                        read_param DHCPPIDFILE $@
+                        exit_on_error "missing parameter for --dhcp"
+                        shift;;
+    --release-dhcp)     RELEASEDHCP=yes
+                        read_param DHCPPIDFILE $@
+                        exit_on_error "missing parameter for --release-dhcp"
                         shift;;
-    --dhcp)                 DHCP=yes;;
     --gateway|-g)           read_param GW $@
                         exit_on_error "missing parameter for --gateway"
                         shift;;
@@ -427,9 +456,16 @@ if is_true $CREATE; then
     create_device $ID $BRIDGENAME $DEVICENAME
 fi
 
+if is_true $UPDATE; then
+    if is_true $RELEASEDHCP; then
+        UPDATE=False
+        release_dhcp $ID "$DEVICENAME" "$DHCPPIDFILE"
+    fi
+fi
+
 if is_true $CREATE || is_true $UPDATE; then
     [ "$MACADDR" != "" ] && assign_mac $ID "$DEVICENAME" "$MACADDR"
-    [ "$DHCP" == "yes" ] && get_ip_dhcp $ID "$DEVICENAME"
+    [ "$DHCP" == "yes" ] && get_ip_dhcp $ID "$DEVICENAME" "$DHCPPIDFILE"
     [ "$IPADDR" != "" ] && assign_ip $ID "$DEVICENAME" "$IPADDR"
     [ "$GW" != "" ] && assign_gw $ID "$DEVICENAME" "$GW"
 fi
diff --git a/vmm/onedock/cancel b/vmm/onedock/cancel
index e4bd1cd..b457d08 100755
--- a/vmm/onedock/cancel
+++ b/vmm/onedock/cancel
@@ -25,9 +25,6 @@ source ${DRIVER_PATH}/vmmfnc.sh
 
 NAME=$1
 
-log_onedock_debug $(docker stop "$NAME" && docker rm "$NAME")
-ERR=$?
-
 ONEDOCK_CONTAINER_FOLDER=${ONEDOCK_FOLDER}/${NAME}
 mkdir -p "$ONEDOCK_CONTAINER_FOLDER"
 ONEDOCK_CLEANUP_FILE=${ONEDOCK_CONTAINER_FOLDER}/deployment.cleanup
@@ -36,6 +33,8 @@ if [ -e "$ONEDOCK_CLEANUP_FILE" ]; then
     exec_file "$ONEDOCK_CLEANUP_FILE" "Failed to cleanup container ($CLEANUP)"
 fi
 
+log_onedock_debug $(docker stop "$NAME" && docker rm "$NAME")
+ERR=$?
 
 # This is just to clean possible snapshots (maybe there are none)
 DISKIMAGENAME=$(build_dock_name "$LOCAL_SERVER" "" "$NAME" "0")
diff --git a/vmm/onedock/vmmfnc.sh b/vmm/onedock/vmmfnc.sh
index 1c5ba78..69e9ed1 100644
--- a/vmm/onedock/vmmfnc.sh
+++ b/vmm/onedock/vmmfnc.sh
@@ -247,6 +247,8 @@ function setup_network {
     BOOTSTRAP_FILE=$5
     ONEDOCK_CONTAINER_FOLDER=$6
 
+    CONTNAME="one-$(echo "$DOMXML" | xmlstarlet sel -t -v /VM/ID)"
+
     cat <<EOT > $NETWORKFILE
 EOT
     NICS="$(echo "$DOMXML" | xmlstarlet sel -t \
@@ -262,6 +264,7 @@ EOT
 
         NICNAME=eth${NIC_ID}
         NIC_STR="--create-device $NICNAME"
+        NIC_STR_UPDATE="--update-device $NICNAME"
         [ "$BRIDGE" != "" ] && BRIDGE_STR="--bridge $BRIDGE"
         [ "$MAC" != "" ] && MAC_STR="--mac $MAC"
         if [ "$IP" != "" ]; then
@@ -315,16 +318,25 @@ EOT
         fi
 
         # If there is a missing value, let's check if we should use DHCP
+        USING_DHCP=False
         if [ "$IP_STR" == "" -o "$GW_STR" == "" ]; then
             if [ "$MAC_STR" != "" ]; then
                 if is_true "$ONEDOCK_DEFAULT_DHCP"; then
-                    IP_STR="--dhcp"
+                    USING_DHCP=True
+                    IP_STR="--dhcp /var/run/dhclient.$CONTNAME-$NICNAME.pid"
+                    IP_STR2="--release-dhcp /var/run/dhclient.$CONTNAME-$NICNAME.pid"
+                    # IP_STR="--dhcp"
                     GW_STR=
                 fi
             fi
         fi
         echo "$SUDO $DN --container-name $CONTAINERNAME \
             $BRIDGE_STR $MAC_STR $IP_STR $NIC_STR $GW_STR" >> $NETWORKFILE
+
+        if [ "$USING_DHCP" == "True" ]; then
+            echo "$SUDO $DN --container-name $CONTAINERNAME \
+                $BRIDGE_STR $IP_STR2 $NIC_STR_UPDATE" >> $CLEANUP_FILE
+        fi
     done
 
     if [ "$ONEDOCK_OVERRIDE_DNS" != "" ]; then