Bash Reconnect Script Telekom Speedport W723V Typ B for NAS

#!/bin/sh
########################################################
# Reconnect Script Telekom Speedport W723V Typ B
# schapplm, 26.01.2013
# Vorlage: Philipp Immel 2012 April 13 für W723V Typ A
########################################################
# Description: Reconnects Speedport W 723V router Typ B
# Syntax: recon
# Extern: read printf echo curl grep awk sleep rm
########################################################

#----------------------
# Read router password
#----------------------
password="YOURPASSWORD"

#---------------------------
# Check external IP address
#---------------------------
echo "Fetching external IP address …"
OLDIP=$( curl -s http://checkip.dyndns.org | sed 's/[a-zA-Z/<> :]//g' )
echo "Your IP before reconnect:" $OLDIP

#----------------------------------------------
# Log on to router and get a session ID cookie
#----------------------------------------------
echo "Logging in …"
curl --user-agent "Mozilla/4.0" --location --cookie-jar "/volume1/pyload/SessionID.txt" --data "pws=$password" --data "login_pwd=2" --referer "https://speedport.ip/hcti_start_passwort.stm" --insecure  "https://speedport.ip/cgi-bin/login.cgi" &> /dev/null
sleep 1

#----------------------------------------------
# Execute Disconnect and Connect Script
#----------------------------------------------
echo "Reconnect …"
curl --user-agent "Mozilla/4.0" --location --cookie-jar "/volume1/pyload/SessionID.txt" --insecure "https://speedport.ip/cgi-bin/disconnect.exe" &> /dev/null
sleep 3
curl --user-agent "Mozilla/4.0" --location --cookie-jar "/volume1/pyload/SessionID.txt" --insecure "https://speedport.ip/cgi-bin/connect.exe" &> /dev/null

#-------------------------
# Log out from the router
#-------------------------
echo "Logging off …"
curl --location --insecure --cookie "/volume1/pyload/SessionID.txt" "https://speedport.ip/cgi-bin/logout.cgi" &> /dev/null
sleep 10

#---------------------------
# Check external IP address
#---------------------------
echo "Fetching external IP address …"
NEWIP=$( curl -s --data "dummy=42" --connect-timeout 120 "http://checkip.dyndns.org/dummy/" | sed 's/[a-zA-Z/<> :]//g' )

#-------------------
# Check for success
#-------------------
if [ "$OLDIP" != "$NEWIP" ] && [ "$NEWIP" != "" ]
then
    echo "Reconnect has been successful. Your new IP address is:" $NEWIP
else
    echo "Reconnect has not been successful. Please try again. Your IP address is still:" $OLDIP
fi

#--------------------
# Remove cookie file
#--------------------
rm /volume1/pyload/SessionID.txt