System->Administration->Networking

Select the Connections tab. select the Ethernet connection interface from the list, then click the Properties button. Ensure that the This device is configured is checked. From the Configuration drop-list select DHCP/Static IP address, then click OK.

Select the DNS tab add or delete DNS Servers in the DNS Servers list.

System->Administration->Networking

Select Network settings+Connections Tab+Ethernet connection Activate/Deactivate

System->Administration->Networking

Select the General tab. Enter the name of the computer in the Hostname field.

Click OK, close all open applications and reboot.

This screen lists all network servers and Samba servers, if computers, network folders or Sambas servers could not be found, try to access them directly.

Places->Network Servers

Before beginning, ensure that your internet connection has been configured properly.

Read How do I add Universe and Multiverse?

Register free Dynamic DNS at http://www.dyndns.org.

Install the ipcheck package with Synaptic (See How do I use Synaptic to install packages?)

sudo gedit /root/dyndns_update.sh

Insert the following lines into the new file

USERNAME=myusername
PASSWORD=mypassword
HOSTNAME=myhostname.dyndns.org
cd /root/
if [ -f /root/ipcheck.dat ]; then
    ipcheck -r checkip.dyndns.org:8245 $USERNAME $PASSWORD $HOSTNAME
else
    ipcheck --makedat -r checkip.dyndns.org:8245 $USERNAME $PASSWORD $HOSTNAME
fi

Save the edited file

sudo chmod 700 /root/dyndns_update.sh 
sudo sh /root/dyndns_update.sh 
export EDITOR=gedit && sudo crontab -e

Append the following line at the end of file to refresh your IP in the DynDNS Database/DNS every hour. The ***** format equals minute, hour, date, month and year respectively.

00 * * * * sudo sh /root/dyndns_update.sh

Save the edited file

You need to compile a kernel including the following (NOT as modules):

ieee1394

ohci1394

eth1394

Reboot your PC

Your firewire ethernet connection should be listed under System-> Administration-> Networking, or you can use ifconfig to list your network devices

See https://wiki.ubuntu.com/EthernetOverFirewire for more information.