diff --git a/change_munin_ip.sh b/change_munin_ip.sh
new file mode 100755
index 0000000..70cfe8e
--- /dev/null
+++ b/change_munin_ip.sh
@@ -0,0 +1,600 @@
+#!/usr/bin/env bash
+
+script_name="$(basename $(realpath $0))"
+working_dir="$(dirname $(realpath $0))"
+
+conf_file="${working_dir}/conf/${script_name%%.*}.conf"
+
+LOCK_DIR="/tmp/${script_name%%.*}.LOCK"
+log_file="${LOCK_DIR}/${script_name%%.*}.log"
+
+
+# ----------
+# Base Function(s)
+# ----------
+
+clean_up() {
+
+   # Perform program exit housekeeping
+   rm -rf "$LOCK_DIR"
+   blank_line
+   exit $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
+}
+
+
+fatal(){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mFatal\033[m ]: $*"
+      echo ""
+      echo -e "   \033[31m\033[1mScript was interupted\033[m!"
+   else
+      echo "   [ Fatal ]: $*"
+      echo ""
+      echo "              Script was terminated...."
+   fi
+   echo ""
+   clean_up 1
+}
+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[1mWarning\033[m ]: $*"
+   else
+      echo "[ Warning ]: $*"
+   fi
+   echo ""
+}
+
+warn_only_terminal () {
+   if $terminal ; then
+      echo ""
+      echo -e "\t[ \033[33m\033[1mWarning\033[m ]: $*"
+      echo ""
+   fi
+}
+
+info (){
+   if $terminal ; then
+      echo ""
+      echo -e "   [ \033[32m\033[1mInfo\033[m ]  $*"
+      echo ""
+   fi
+}
+
+ok (){
+   if $terminal ; then
+      echo ""
+      echo -e "   [ \033[32m\033[1mOk\033[m ]    $*"
+      echo ""
+   fi
+}
+
+echo_done() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[32mdone\033[m ]"
+   fi
+}
+echo_ok() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[32mok\033[m ]"
+   fi
+}
+echo_warn() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[33mwarn\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[90m\033[1mskipped\033[m ]"
+   fi
+}
+echo_wait(){
+   if $terminal ; then
+      echo -en "\033[75G[ \033[5m\033[1m...\033[m ]"
+   fi
+}
+
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+blank_line() {
+   if $terminal ; then
+      echo ""
+   fi
+}
+
+containsElement () {
+   local e
+   for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done
+   return 1
+}
+
+is_number() {
+
+   return $(test ! -z "${1##*[!0-9]*}" > /dev/null 2>&1);
+
+   # - also possible
+   # -
+   #[[ ! -z "${1##*[!0-9]*}" ]] && return 0 || return 1
+   #return $([[ ! -z "${1##*[!0-9]*}" ]])
+}
+
+is_valid_ipv4() {
+  local -a octets=( ${1//\./ } )
+  local RETURNVALUE=0
+
+  # return an error if the IP doesn't have exactly 4 octets
+  [[ ${#octets[@]} -ne 4 ]] && return 1
+
+  for octet in ${octets[@]}
+  do
+    if [[ ${octet} =~ ^[0-9]{1,3}$ ]]
+    then # shift number by 8 bits, anything larger than 255 will be > 0
+      ((RETURNVALUE += octet>>8 ))
+    else # octet wasn't numeric, return error
+      return 1
+    fi
+  done
+  return ${RETURNVALUE}
+}
+
+# - Test if given argument is a valid IPv6 Address
+# -
+#is_valid_ipv6() {
+#   local _ipv6=$1
+#
+#   if [ "$1" != "${1#[0-9a-f]*:}" ] \
+#      && [ "$1" = "${1#*[^0-9a-f:]}" ] \
+#      && [ "${1#*[0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f]}" = "${1#*:*:*:*:*:*:*:*:*:}" ]; then
+#      return 0
+#   else
+#      return 1
+#   fi
+#}
+is_valid_ipv6() {
+   local _ipv6="$1"
+
+   _regex_ipv6='^([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}$'
+
+
+   if [[ "$_ipv6" =~ ${_regex_ipv6} ]]; then
+      return 0
+   else
+      return 1
+   fi
+}
+
+
+
+# ----------
+# Some checks ..
+# ----------
+
+# - Running in a terminal?
+# -
+if [[ -t 1 ]] ; then
+   terminal=true
+else
+   terminal=false
+fi
+
+
+# ----------
+# Default Values
+# ----------
+
+BATCH_MODE=false
+
+DEFAULT_MUNIN_CONF_FILE='/etc/munin/munin-node.conf'
+
+DEFAULT_IPT_FIREWALL_MAIN_IPV4_FILE='/etc/ipt-firewall/main_ipv4.conf'
+DEFAULT_IPT_FIREWALL_MAIN_IPV6_FILE='/etc/ipt-firewall/main_ipv6.conf'
+
+# ----------
+# Read Configuration
+# ----------
+
+if [[ -f "$conf_file" ]]; then
+   source "$conf_file"
+else
+   warn_only_terminal "No configuration file '$conf_file' present.\n
+                     Loading default values.."
+fi
+
+
+# ----------
+# Read commandline parameter
+# ----------
+
+while getopts bh opt ; do
+   case $opt in
+      b)    BATCH_MODE=true
+            ;;
+      h)    usage
+            ;;
+      \?)   usage ;;
+   esac
+done
+
+if [[ -n "${IPv4_ADDRESS_OLD}" ]] ; then 
+   _IPv4_ADDRESS_OLD="${IPv4_ADDRESS_OLD}"
+fi
+
+if [[ -n "${IPv6_ADDRESS_OLD}" ]] ; then 
+   _IPv6_ADDRESS_OLD="${IPv6_ADDRESS_OLD}"
+fi
+
+if [[ -n "${IPv4_ADDRESS_NEW}" ]] ; then 
+   _IPv4_ADDRESS_NEW="${IPv4_ADDRESS_NEW}"
+fi
+
+if [[ -n "${IPv6_ADDRESS_NEW}" ]] ; then 
+   _IPv6_ADDRESS_NEW="${IPv6_ADDRESS_NEW}"
+fi
+
+if [[ -z "${MUNIN_CONF_FILE}" ]]; then
+   MUNIN_CONF_FILE="${DEFAULT_MUNIN_CONF_FILE}"
+fi
+
+if ${BATCH_MODE} && ( [[ -z "${IPv4_ADDRESS_OLD}" ]] || [[ -z "${IPv4_ADDRESS_NEW}" ]] \
+                      || [[ -z "${IPv6_ADDRESS_OLD}" ]] || [[ -z "${IPv6_ADDRESS_NEW}" ]] ) ; then
+
+   [[ -z "${IPv4_ADDRESS_OLD}" ]]  && fatal "Variable 'IPv4_ADDRESS_OLD' is empty and we are in batch mode!"
+   [[ -z "${IPv4_ADDRESS_NEW}" ]]  && fatal "Variable 'IPv4_ADDRESS_NEW' is empty and we are in batch mode!"
+   [[ -z "${IPv6_ADDRESS_OLD}" ]]  && fatal "Variable 'IPv6_ADDRESS_OLD' is empty and we are in batch mode!"
+   [[ -z "${IPv6_ADDRESS_NEW}" ]]  && fatal "Variable 'IPv6_ADDRESS_NEW' is empty and we are in batch mode!"
+
+   fatal "Something wired went wrong.."
+fi
+
+if ! ${BATCH_MODE} ; then
+   echo ""
+   echo -e "\033[32m--\033[m"
+   echo ""
+   echo "Insert IPv4-Address which do you want to change (old address)."
+   echo ""
+   echo -e "Type \"\033[33mNone\033[m\" if no IPv4 address should be changed."
+   echo ""
+   IPv4_ADDRESS_OLD=
+   _set_ipv4=true
+   while [ "X$IPv4_ADDRESS_OLD" = "X" ]; do
+
+      if [[ -z "${_IPv4_ADDRESS_OLD}" ]]; then
+         echononl "Old IPv4-Address: "
+
+         read IPv4_ADDRESS_OLD
+
+         ## - To lower case
+         IPv4_ADDRESS_OLD=${IPv4_ADDRESS_OLD,,}
+
+         if [ "X$IPv4_ADDRESS_OLD" = "X" ]; then
+            echo -e "\n\t\033[33m\033[1mAn entry is required!\033[m\n"
+            IPv4_ADDRESS_OLD=""
+            continue
+         fi
+
+      else
+         echononl "Old IPv4-Address: [${_IPv4_ADDRESS_OLD}]: "
+
+         read IPv4_ADDRESS_OLD
+
+         ## - To lower case
+         IPv4_ADDRESS_OLD=${IPv4_ADDRESS_OLD,,}
+
+         if [[ -z "$(trim ${IPv4_ADDRESS_OLD})" ]]; then
+            IPv4_ADDRESS_OLD=${_IPv4_ADDRESS_OLD}
+         fi
+      fi
+
+      if [ "${IPv4_ADDRESS_OLD,,}" = "none" ];then
+         _set_ipv4=false
+         break
+      fi
+
+      if ! is_valid_ipv4 $IPv4_ADDRESS_OLD ; then
+         echo -e "\n\t\033[33m\033[1m$IPv4_ADDRESS_OLD\033[m is NOT a valid IPv4 Address\n"
+         IPv4_ADDRESS_OLD=""
+         continue
+      fi
+   done
+
+   if $_set_ipv4 ; then
+      echo ""
+      echo -e "\033[32m--\033[m"
+      echo ""
+      echo "Insert IPv4-Address of the new munin server."
+      echo ""
+
+      IPv4_ADDRESS_NEW=
+
+      while [ "X$IPv4_ADDRESS_NEW" = "X" ]; do
+
+
+         if [[ -z "${_IPv4_ADDRESS_NEW}" ]]; then
+            echononl "New IPv4-Address: "
+
+            read IPv4_ADDRESS_NEW
+
+            ## - To lower case
+            IPv4_ADDRESS_NEW=${IPv4_ADDRESS_NEW,,}
+
+            if [ "X$IPv4_ADDRESS_NEW" = "X" ]; then
+               echo -e "\n\t\033[33m\033[1mAn entry is required!\033[m\n"
+               IPv4_ADDRESS_NEW=""
+               continue
+            fi
+
+         else
+
+            echononl "New IPv4-Address [${_IPv4_ADDRESS_NEW}]: "
+
+            read IPv4_ADDRESS_NEW
+            
+            ## - To lower case
+            IPv4_ADDRESS_NEW=${IPv4_ADDRESS_NEW,,}
+
+            if [[ -z "$(trim ${IPv4_ADDRESS_NEW})" ]]; then
+               IPv4_ADDRESS_NEW=${_IPv4_ADDRESS_NEW}
+            fi
+
+         fi
+
+         if ! is_valid_ipv4 $IPv4_ADDRESS_NEW ; then
+            echo -e "\n\t\033[33m\033[1m$IPv4_ADDRESS_NEW\033[m is NOT a valid IPv4 Address\n"
+            IPv4_ADDRESS_NEW=""
+            continue
+         fi
+      done
+   fi
+
+
+   echo ""
+   echo -e "\033[32m--\033[m"
+   echo ""
+   echo "Insert IPv6-Address which do you want to change (old address)."
+   echo ""
+   echo -e "Type \"\033[33mnone\033[m\" if no IPv6 address should be changed."
+   echo ""
+   IPv6_ADDRESS_OLD=
+   _set_ipv6=true
+   while [ "X$IPv6_ADDRESS_OLD" = "X" ]; do
+
+      if [[ -z "${_IPv6_ADDRESS_OLD}" ]]; then
+         echononl "Old IPv6-Address: "
+
+         read IPv6_ADDRESS_OLD
+
+         ## - To lower case
+         IPv6_ADDRESS_OLD=${IPv6_ADDRESS_OLD,,}
+
+         if [ "X$IPv6_ADDRESS_OLD" = "X" ]; then
+            echo -e "\n\t\033[33m\033[1mAn entry is required!\033[m\n"
+            IPv6_ADDRESS_OLD=""
+            continue
+         fi
+
+      else
+         echononl "Old IPv6-Address: [${_IPv6_ADDRESS_OLD}]: "
+
+         read IPv6_ADDRESS_OLD
+
+         ## - To lower case
+         IPv6_ADDRESS_OLD=${IPv6_ADDRESS_OLD,,}
+
+         if [[ -z "$(trim ${IPv6_ADDRESS_OLD})" ]]; then
+            IPv6_ADDRESS_OLD=${_IPv6_ADDRESS_OLD}
+         fi
+      fi
+
+      if [ "${IPv6_ADDRESS_OLD,,}" = "none" ];then
+         _set_IPv6=false
+         break
+      fi
+
+      if ! is_valid_ipv6 $IPv6_ADDRESS_OLD ; then
+         echo -e "\n\tXX\033[33m\033[1m$IPv6_ADDRESS_OLD\033[mXX is NOT a valid IPv6 Address\n"
+         IPv6_ADDRESS_OLD=""
+         continue
+      fi
+   done
+
+   if $_set_ipv6 ; then
+
+      echo ""
+      echo -e "\033[32m--\033[m"
+      echo ""
+      echo "Insert IPv6-Address iof the new munin server"
+      echo ""
+
+      IPv6_ADDRESS_NEW=
+
+
+      while [ "X$IPv6_ADDRESS_NEW" = "X" ]; do
+
+
+         if [[ -z "${_IPv6_ADDRESS_NEW}" ]]; then
+            echononl "New IPv6-Address: "
+
+            read IPv6_ADDRESS_NEW
+
+            ## - To lower case
+            IPv6_ADDRESS_NEW=${IPv6_ADDRESS_NEW,,}
+
+            if [ "X$IPv6_ADDRESS_NEW" = "X" ]; then
+               echo -e "\n\t\033[33m\033[1mAn entry is required!\033[m\n"
+               IPv6_ADDRESS_NEW=""
+               continue
+            fi
+
+         else
+
+            echononl "New IPv6-Address [${_IPv6_ADDRESS_NEW}]: "
+
+            read IPv6_ADDRESS_NEW
+            
+            ## - To lower case
+            IPv6_ADDRESS_NEW=${IPv6_ADDRESS_NEW,,}
+
+            if [[ -z "$(trim ${IPv6_ADDRESS_NEW})" ]]; then
+               IPv6_ADDRESS_NEW=${_IPv6_ADDRESS_NEW}
+            fi
+
+         fi
+
+         if ! is_valid_ipv6 $IPv6_ADDRESS_NEW ; then
+            echo -e "\n\t\033[33m\033[1m$IPv6_ADDRESS_NEW\033[m is NOT a valid IPv6 Address\n"
+            IPv6_ADDRESS_NEW=""
+            continue
+         fi
+      done
+
+   fi
+fi
+
+#clear
+echo ""
+echo ""
+echo -e "\033[14G\033[32mReplace IP-Address(es) for munin server\033[m"
+echo ""
+
+if $_set_ipv4 ; then
+   echo "   Old IPv4 Address...........................: $IPv4_ADDRESS_OLD"
+   echo "   New IPv4 Address...........................: $IPv4_ADDRESS_NEW"
+else
+   echo -e "   IPv4 Address(es)...........................: \033[33mNone\033[m"
+fi
+echo ""
+if $_set_ipv6 ; then
+   echo "   Old IPv6 Address...........................: $IPv6_ADDRESS_OLD"
+   echo "   New IPv6 Address...........................: $IPv6_ADDRESS_NEW"
+else
+   echo -e "   IPv6 Address(es)........................: \033[33mNone\033[m"
+fi
+echo ""
+echo -e "   Munin Node configuration file..............: \033[33m${MUNIN_CONF_FILE}\033[m"
+echo -e "   ipt firewall main IPv4 file................: \033[33m${IPT_FIREWALL_MAIN_IPV4_FILE}\033[m"
+echo -e "   ipt firewall main IPv6 file................: \033[33m${IPT_FIREWALL_MAIN_IPV6_FILE}\033[m"
+
+
+echo ""
+OK=
+while [ "$OK" != "yes" -o "$OK" != "no" ] ; do
+   echononl "Parameters ok? [yes/no]: "
+   read OK
+   ## - To lower case
+   OK=${OK,,}
+   if [ "X$OK" = "X" ]; then
+      echo -e "\n\t\033[33m\033[1mAn entry is required!\033[m\n"
+      OK=""
+      continue
+   fi
+   if [ "$OK" != "yes" -o "$OK" != "no" ] ; then
+      break
+   fi
+   echo -e "\n\t\033[33m\033[1mWrong entry!\033[m\n"
+done
+[[ $OK = "yes" ]] || fatal Repeat execution with different parameters
+
+blank_line
+blank_line
+
+
+echononl "   Replace ${IPv4_ADDRESS_OLD} in file '${MUNIN_CONF_FILE}'.."
+if [[ -f "${MUNIN_CONF_FILE}" ]] ; then
+   if $(grep -q "${IPv4_ADDRESS_OLD}" "${MUNIN_CONF_FILE}" 2> /dev/null) ; then
+      perl  -i -n -p -e "s#${IPv4_ADDRESS_OLD}#${IPv4_ADDRESS_NEW}#g" "${MUNIN_CONF_FILE}" > /dev/null 2>&1
+      if [[  $? -gt 0 ]]; then
+         echo_failed
+      else
+         echo_ok
+      fi
+   else
+      echo_skipped
+   fi
+else
+   echo_skipped
+fi
+
+echononl "   Replace ${IPv6_ADDRESS_OLD} in file '${MUNIN_CONF_FILE}'.."
+if [[ -f "${MUNIN_CONF_FILE}" ]] ; then
+   if $(grep -q "${IPv6_ADDRESS_OLD}" "${MUNIN_CONF_FILE}" 2> /dev/null) ; then
+      perl  -i -n -p -e "s#${IPv6_ADDRESS_OLD}#${IPv6_ADDRESS_NEW}#g" "${MUNIN_CONF_FILE}" > /dev/null 2>&1
+      if [[  $? -gt 0 ]]; then
+         echo_failed
+      else
+         echo_ok
+      fi
+   else
+      echo_skipped
+   fi
+else
+   echo_skipped
+fi
+
+
+echononl "   Replace ${IPv4_ADDRESS_OLD} in file '${IPT_FIREWALL_MAIN_IPV4_FILE}'.."
+if [[ -f "${IPT_FIREWALL_MAIN_IPV4_FILE}" ]] ; then
+   if $(grep -q -E "munin_remote_ip=\"?${IPv4_ADDRESS_OLD}\"?" "${IPT_FIREWALL_MAIN_IPV4_FILE}" 2> /dev/null) ; then
+      perl  -i -n -p -e "s#munin_remote_ip=\"?${IPv4_ADDRESS_OLD}\"?#munin_remote_ip=\"${IPv4_ADDRESS_NEW}\"#g" "${IPT_FIREWALL_MAIN_IPV4_FILE}" > /dev/null 2>&1
+      if [[  $? -gt 0 ]]; then
+         echo_failed
+      else
+         echo_ok
+      fi
+   else
+      echo_skipped
+   fi
+else
+   echo_skipped
+fi
+
+echononl "   Replace ${IPv6_ADDRESS_OLD} in file '${IPT_FIREWALL_MAIN_IPV6_FILE}'.."
+if [[ -f "${IPT_FIREWALL_MAIN_IPV6_FILE}" ]] ; then
+   if $(grep -q -E "munin_remote_ip=\"?${IPv6_ADDRESS_OLD}\"?" "${IPT_FIREWALL_MAIN_IPV6_FILE}" 2> /dev/null) ; then
+      perl  -i -n -p -e "s#munin_remote_ip=\"?${IPv6_ADDRESS_OLD}\"?#munin_remote_ip=\"${IPv6_ADDRESS_NEW}\"#g" "${IPT_FIREWALL_MAIN_IPV6_FILE}" > /dev/null 2>&1
+      if [[  $? -gt 0 ]]; then
+         echo_failed
+      else
+         echo_ok
+      fi
+   else
+      echo_skipped
+   fi
+else
+   echo_skipped
+fi
+
+clean_up 0
diff --git a/conf/change_munin_ip.conf.sample b/conf/change_munin_ip.conf.sample
new file mode 100644
index 0000000..9348f42
--- /dev/null
+++ b/conf/change_munin_ip.conf.sample
@@ -0,0 +1,56 @@
+# -------------------------------------------
+# - Settings for script check-connectivity.sh
+# -------------------------------------------
+
+# IPv4_ADDRESS_OLD
+#
+# Example:
+#  IPv4_ADDRESS_OLD=135.181.136.84
+#
+#IPv4_ADDRESS_OLD=
+
+
+# IPv4_ADDRESS_NEW
+#
+# Example:
+#  IPv4_ADDRESS_NEW=37.27.121.227
+#
+#IPv4_ADDRESS_NEW=
+
+
+# IPv6_ADDRESS_OLD
+#
+# Example:
+#  IPv6_ADDRESS_OLD='2a01:4f9:3a:1051::84'
+#
+# IPv6_ADDRESS_OLD
+
+
+# IPv6_ADDRESS_NEW
+#
+# Example:
+#  IPv6_ADDRESS_NEW='2a01:4f9:3070:2bda::227'
+#
+#IPv6_ADDRESS_NEW=
+
+
+# MUNIN_CONF_FILE
+#
+# Defaults to: /etc/munin/munin-node.conf
+#    
+#MUNIN_CONF_FILE='/etc/munin/munin-node.conf'
+
+
+# IPT_FIREWALL_MAIN_IPV4_FILE
+#
+# Defaults to: /etc/ipt-firewall/main_ipv4.conf
+#
+#IPT_FIREWALL_MAIN_IPV4_FILE='/etc/ipt-firewall/main_ipv4.conf'
+
+
+# IPT_FIREWALL_MAIN_IPV6_FILE
+#
+#Defaults to:  /etc/ipt-firewall/main_ipv6.conf
+#
+#IPT_FIREWALL_MAIN_IPV6_FILE='/etc/ipt-firewall/main_ipv6.conf'
+