1. Update IP address to domain service

Dynamic DNS
By using a domain name service, you can easily connect to your Raspberry Pi when you are not home. This is actually necessary if the IP address given by your provider changes frequently. But also if you always have the same IP: simply using a pretty url to connect is nice.

Schedule this script to run every x hours, mine runs every 4 hours:
crontab -e
add this line at the bottom:
0 */4 * * * sudo sh /etc/ipupdate/ipupdate.sh



# this script will check if the current external IP address has been changed by your ISP internet provider.
# If so, it will update your subdomain (for example: mypc.freedns.org). This way, you will always be able to
# connect to your Raspberry when you are not at home and don't know the IP address of your home. Also handy
# if your ISP internet provider keeps changing your IP.

TOKEN="UHpTbTVsZGtIODBuWldKY0IxcW1hWTlBOjEwNDg1NDY2"
IFACE=eth0

if test -f /etc/ipupdate/ipupdate.conf
then
CacheIP=$(cat /etc/ipupdate/ipupdate.conf)
fi

ExternIP=$(wget -qO- http://ipecho.net/plain)

if [ "$ExternIP" = "$CacheIP" ]
then
# Both IP are equal
echo "Update not required..."
else
# The IP has change
echo "Updating http://free.afraid.org with " $ExternIP
wget http://freedns.afraid.org/dynamic/update.php?$TOKEN -o /dev/null -O /dev/stdout
echo `date` "Updating log with IP " $ExternIP >> /var/log/dmesg
fi
sudo rm -f /etc/ipupdate/ipupdate.conf
sudo echo $ExternIP > /etc/ipupdate/ipupdate.conf