diff --git a/check-connectivity.sh b/check-connectivity.sh
new file mode 100755
index 0000000..de82626
--- /dev/null
+++ b/check-connectivity.sh
@@ -0,0 +1,479 @@
+#!/usr/bin/env bash
+
+script_name="$(basename $(realpath $0))"
+working_dir="$(dirname $(realpath $0))"
+
+conf_file="${working_dir}/conf/${script_name%%.*}.conf"
+
+LOCK_DIR="/tmp/$(basename $0).$$.LOCK"
+log_file="${LOCK_DIR}/${script_name%%.*}.log"
+
+PROBLEM_FOUND=false
+
+LINK_UP=false
+RESTART_CHECK_FILE="/tmp/${script_name%%.*}.NEED-RESTART"
+
+
+# ----------
+# Base Function(s)
+# ----------
+
+clean_up() {
+
+   # Perform program exit housekeeping
+   rm -rf "$LOCK_DIR"
+   blank_line
+   exit $1
+}
+
+usage() {
+
+
+   [[ -n  "$1" ]] && error "$1"
+
+
+   [[ $terminal ]] && echo -e "
+\033[1mUsage:\033[m
+
+   $(basename $0)
+
+\033[1mDescription\033[m
+
+   Script checks presence of some basic network settings and do some basic connectivity
+   tests. If fundamental problems found, then restart machine if this i not the firts time.
+   If this i the first time, file \033[1m$RESTART_CHECK_FILE\033[m is created.
+
+\033[1mOptions\033[m
+
+   No Options present
+
+\033[1mFiles\033[m
+
+   $conf_file: Configuration file
+
+\033[1mExample:\033[m
+
+   Chech connectivity of this machine
+
+      $(basename $0)
+
+"
+
+   clean_up 1
+
+}
+
+
+echononl(){
+   if $terminal ; then
+      echo X\\c > /tmp/shprompt$$
+      if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
+         echo -e -n "   $*\\c" 1>&2
+      else
+         echo -e -n "   $*" 1>&2
+      fi
+      rm /tmp/shprompt$$
+   fi
+}
+
+error (){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mError\033[m ] $*"
+   else
+      echo "   [ Error ] $*"
+   fi
+   echo ""
+}
+
+warn (){
+	echo ""
+	if $terminal ; then
+		echo -e "   [ \033[33m\033[1mWarn\033[m ]  $*"
+	else
+		echo "   [ Warn ]  $*"
+	fi
+	echo ""
+}
+
+info (){
+	if $terminal ; then
+		echo ""
+		echo -e "   [ \033[32m\033[1mInfo\033[m ]  $*"
+		echo ""
+	fi
+}
+
+echo_ok() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[32mok\033[m ]"
+   fi
+}
+echo_failed(){
+   if $terminal ; then
+      echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
+   fi
+}
+echo_skipped() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[33m\033[1mskipped\033[m ]"
+   fi
+}
+
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+blank_line() {
+   if $terminal ; then
+      echo ""
+   fi
+}
+
+
+# Check if at least one interface has physical link is up
+#
+online() {
+
+   # Call this functionin a subshell to avoid exiting main programm
+   #
+   # Example: 
+   #    $(online) && echo -e '\033[32m\033[1mOnline\033[m' || echo -e '\033[31m\033[1mOFFLINE\033[m'
+   #
+   find /sys/class/net/ -maxdepth 1 -mindepth 1 \
+      ! -name "*lo*" \
+      ! -name "*tun*" \
+      ! -name "*veth*" \
+      -exec sh -c 'cat "$0"/carrier 2>&1' {} \; | grep -q -E '^1$' && exit 0 
+      
+      # using ethtool also works:
+      #
+      #-exec sh -c 'ethtool $(basename "$0") 2>&1' {} \; | grep 'ink detected' | grep -i -q 'yes' && exit 0
+
+}
+
+# ----------
+# - Jobhandling
+# ----------
+
+# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
+# -
+trap clean_up SIGHUP SIGINT SIGTERM
+
+# - Create lock directory '$LOCK_DIR"
+#
+mkdir "$LOCK_DIR"
+
+
+# ----------
+# - Some checks ..
+# ----------
+
+# - Running in a terminal?
+# -
+if [[ -t 1 ]] ; then
+   terminal=true
+else
+   terminal=false
+fi
+
+# - Print help?
+# -
+if [[ "$(trim $*)" = "-h" ]] || [[ "$(trim $*)" = "--help" ]] ; then
+    usage
+fi
+
+
+# ==========
+# - Begin Main Script
+# ==========
+
+# ----------
+# - Headline
+# ----------
+
+if $terminal ; then
+   echo ""
+   echo -e "\033[1m----------\033[m"
+   echo -e "\033[32m\033[1mRunning script \033[m\033[1m$script_name\033[32m .. \033[m"
+   echo -e "\033[1m----------\033[m"
+   echo ""
+fi
+
+# ----------
+#  Read Configurations from $conf_file
+# ----------
+
+
+# - Give your default values here
+# -
+DEFAULT_IPV6_PRESENT=true
+DEFAULT_CHECK_HOSTS="www.oopen.de www.google.de www.heise.de www.debian.org"
+
+echononl "Load Configurations from file '$(basename "$conf_file")'."
+if [[ -f "$conf_file" ]]; then
+   source "$conf_file"
+   echo_ok
+else
+   echo_skipped
+   warn "No configuration file found. Loading script default values.."
+fi
+
+[[ -z "$IPV6_PRESENT" ]] && IPV6_PRESENT="$DEFAULT_IPV6_PRESENT"
+[[ -z "$DNS_CHECK_HOSTS" ]] && DNS_CHECK_HOSTS="$DEFAULT_CHECK_HOSTS"
+[[ -z "$HTTPS_CHECK_HOSTS" ]] && HTTPS_CHECK_HOSTS="$DEFAULT_CHECK_HOSTS"
+
+
+blank_line
+
+
+echononl "Check if at least one interface has physical link is up"
+if ! $(online) ; then
+   echo_failed
+   PROBLEM_FOUND=true
+else
+   echo_ok
+   LINK_UP=true
+fi
+
+if $LINK_UP ; then
+   info 'Machine has at least one interface with physical link is up.'
+else
+   error 'Machine is OFFLINE'
+   if [[ -f "$RESTART_CHECK_FILE" ]] ; then
+
+      _file_mod_time=$(date --utc --reference=$RESTART_CHECK_FILE +%s)
+      _now=$(date +%s)
+      _delta=$(($_now-$_file_mod_time))
+      echo "_delta=: $_delta"
+
+      if [[ $_delta -gt 3900 ]] ; then
+         touch "$RESTART_CHECK_FILE"
+      else
+         /sbin/reboot -f
+      fi
+   else
+      touch "$RESTART_CHECK_FILE"
+   fi
+   clean_up 1
+fi
+
+
+# ---
+# Routing ok?
+# ---
+
+# Determin IPv4 default gateway(s)
+#
+DEFAULT_GW_4="$(/sbin/ip -4 route | awk '/default/ { print $3 }')"
+if [[ -z "$DEFAULT_GW_4" ]] ; then
+   DEFAULT_GW_4="$(/sbin/ip -4 route | awk '/nexthop/ { print $3 }')"
+fi
+
+declare -a DEFAULT_GW_4_ARR=()
+for _ip in $DEFAULT_GW_4 ; do
+   DEFAULT_GW_4_ARR+=("$_ip")
+done
+
+echononl "Check if IPv4 default route is set.."
+
+if [[ ${#DEFAULT_GW_4_ARR[@]} -gt 0 ]] ; then
+   echo_ok
+   if [[ ${#DEFAULT_GW_4_ARR[@]} -eq 1 ]] ; then
+      info "Default IPv4 Gateway(s): ${DEFAULT_GW_4_ARR[@]}"
+   else
+      msg="Default IPv4 Gateway(s): ${DEFAULT_GW_4_ARR[0]}"
+      for index in "${!DEFAULT_GW_4_ARR[@]}"; do 
+         [[ $index -eq 0 ]] && continue
+         msg="$msg
+                                      ${DEFAULT_GW_4_ARR[$index]}"
+      done
+      info "$msg"
+   fi
+else
+   echo_failed
+   PROBLEM_FOUND=true
+
+   error "No default route IPV4is set."
+
+   if [[ -f "$RESTART_CHECK_FILE" ]] ; then
+
+      _file_mod_time=$(date --utc --reference=$RESTART_CHECK_FILE +%s)
+      _now=$(date +%s)
+      _delta=$(($_now-$_file_mod_time))
+      echo "_delta=: $_delta"
+
+      if [[ $_delta -gt 3900 ]] ; then
+         touch "$RESTART_CHECK_FILE"
+      else
+         /sbin/reboot -f
+      fi
+   else
+      touch "$RESTART_CHECK_FILE"
+   fi
+   clean_up 1
+fi
+
+
+# Determin IPv6 default gateway(s)
+#
+if $IPV6_PRESENT ; then
+   DEFAULT_GW_6="$(/sbin/ip -6 route | awk '/default/ { print $3 }')"
+
+   declare -a DEFAULT_GW_6_ARR=()
+   for _ip in $DEFAULT_GW_6 ; do
+      DEFAULT_GW_6_ARR+=("$_ip")
+   done
+
+   echononl "Check if IPv6 default route is set.."
+   if [[ ${#DEFAULT_GW_6_ARR[@]} -gt 0 ]] ; then
+      echo_ok
+      if [[ ${#DEFAULT_GW_6_ARR[@]} -eq 1 ]] ; then
+         info "Default IPv6 Gateway(s): ${DEFAULT_GW_6_ARR[@]}"
+      else
+         msg="Default IPv6 Gateway(s): ${DEFAULT_GW_6_ARR[0]}"
+         for index in "${!DEFAULT_GW_6_ARR[@]}"; do 
+            [[ $index -eq 0 ]] && continue
+            msg="$msg
+                                      ${DEFAULT_GW_6_ARR[$index]}"
+         done
+         info "$msg"
+      fi
+   else
+      echo_failed
+
+      warn "No default route IPv6 is set."
+   fi
+
+fi
+
+
+# ---
+# Nameservice ok?
+# ---
+
+FOUND_NS_PROBLEM=true
+
+# Check if nameserver entry at /etc/resolv.conf ist present
+# 
+echononl "Check if nameserver entry at /etc/resolv.conf ist present.."
+FIRST_NS="$(cat /etc/resolv.conf | awk '/nameserver/ {print $2}' | awk 'NR == 1 {print; exit}')"
+if [[ -n "$FIRST_NS" ]] ; then
+   echo_ok
+   FOUND_NS_PROBLEM=false
+   
+   info "Found nameserver \033[1m$FIRST_NS\033[m at '/etc/resolv.conf'."
+else
+   echo_failed
+   error "No nameserverentry at '/etc/resolv.conf' found."
+fi
+
+
+# Check if nameservice works..
+#
+echononl "Check if first nameserver works.."
+if ! $FOUND_NS_PROBLEM ; then
+
+   FOUND_NS_PROBLEM=true
+
+   for _hostname in $DNS_CHECK_HOSTS ; do
+      if [[ -n "$(dig +short @$FIRST_NS $_hostname)" ]] ; then
+         FOUND_NS_PROBLEM=false
+         break
+      fi
+   done
+
+   if $FOUND_NS_PROBLEM ; then
+      echo_failed
+      PROBLEM_FOUND=true
+
+      error "First nameserver located at /etc/resolv.conf does not work properly."
+
+      if [[ -f "$RESTART_CHECK_FILE" ]] ; then
+
+         _file_mod_time=$(date --utc --reference=$RESTART_CHECK_FILE +%s)
+         _now=$(date +%s)
+         _delta=$(($_now-$_file_mod_time))
+         echo "_delta=: $_delta"
+
+         if [[ $_delta -gt 3900 ]] ; then
+            touch "$RESTART_CHECK_FILE"
+         else
+            /sbin/reboot -f
+         fi
+      else
+         touch "$RESTART_CHECK_FILE"
+      fi
+      clean_up 1
+   else
+      echo_ok
+
+      info "Nameserver works as expected."
+   fi
+else
+   echo_skipped
+   warn "Test was not triggert because of nameserver problems.."
+fi
+
+
+# ---
+# Website reachable?
+# ---
+
+FOUND_CHECK_HOST_PROBLEM=true
+
+# Check if some websites reachable..
+#
+for _host in $HTTPS_CHECK_HOSTS ; do
+   echononl "Check if website \033[1m$_host\033[m is reachable.."
+   if ! $FOUND_NS_PROBLEM ; then
+
+      case "$(curl -s --max-time 2 -I $_host | sed 's/^[^ ]*  *\([0-9]\).*/\1/; 1q')" in
+         [23]) echo_ok
+               FOUND_CHECK_HOST_PROBLEM=false
+               break
+               ;;
+         5)    echo_failed
+               error "The web proxy won't let us through"
+               ;;
+
+         *)    echo_failed
+               error "Something is wrong with HTTP connections. Go check it."
+               ;;
+      esac
+   else
+      echo_skipped
+      warn "Test was not triggert because of nameserver problems.."
+      break
+   fi
+
+done
+
+if $FOUND_CHECK_HOST_PROBLEM ; then
+
+   PROBLEM_FOUND=true
+
+   if [[ -f "$RESTART_CHECK_FILE" ]] ; then
+
+      _file_mod_time=$(date --utc --reference=$RESTART_CHECK_FILE +%s)
+      _now=$(date +%s)
+      _delta=$(($_now-$_file_mod_time))
+      echo "_delta=: $_delta"
+
+      if [[ $_delta -gt 3900 ]] ; then
+         touch "$RESTART_CHECK_FILE"
+      else
+         /sbin/reboot -f
+      fi
+   else
+      touch "$RESTART_CHECK_FILE"
+   fi
+   clean_up 1
+fi
+
+
+! $PROBLEM_FOUND && rm -f "$RESTART_CHECK_FILE"
+clean_up 0
diff --git a/conf/check-connectivity.conf.sample b/conf/check-connectivity.conf.sample
new file mode 100644
index 0000000..5b8a50f
--- /dev/null
+++ b/conf/check-connectivity.conf.sample
@@ -0,0 +1,33 @@
+# -------------------------------------------
+# - Settings for script check-connectivity.sh
+# -------------------------------------------
+
+# - IPV6_PRESENT
+# -
+# - Possible values: true/false
+# -
+# - Example:
+# -    IPV6_PRESENT=false
+# -
+# - Default value: true
+# -
+#IPV6_PRESENT=true
+
+
+# - DNS_CHECK_HOSTS
+# -
+# - Blank sepatated list of hostnames checked by lokal nameservice simply
+# - for their ip-addresses
+# - 
+# - Defaults to: DNS_CHECK_HOSTS="www.oopen.de www.google.com www.heise.de"
+# -
+#DNS_CHECK_HOSTS="www.oopen.de www.google.com www.heise.de www.debian.org"
+
+
+# - HTTPS_CHECK_HOSTS
+# -
+# - Blank sepatated list of websites which will be checked for accessibility
+# -
+# - Defaults to: HTTPS_CHECK_HOSTS="www.oopen.de www.google.com www.heise.de"
+# -
+#HTTPS_CHECK_HOSTS="www.oopen.de www.google.com www.heise.de www.debian.org"