# The primary network interface
auto eth0
iface eth0 inet static
address 109.255.XXX.XXX
netmask 255.255.255.0
broadcast 192.168.15.102
gateway 192.168.15.1
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The problem is your 'address 109.255.xxx.xxx' line...
it should be 'address 192.168.15.xxx' where you choose an IP address for your server on your local network!
You then just port forward traffic from your router to your local server....
You need to setup a external DNS with someone like DynDNS eg. fulgas.dyndns.info which points to your 109.255.xxx.xxx address
Your broadcast address should also be 192.168.15.255
Make sure you edit the /etc/resolv.conf file and enter your nameservers -
i.e. ‘name server xxx.xxx.xxx.xxx’
Finally...if its still not working, make sure your DHCP client has been removed - sudo apt-get remove dhcp-client