During an install you will be asked whether to try DHCP to obtain your network information from a DHCP server. This (usually) requires that you identify your host as a host that your DHCP server knows or relies on the DHCP server allocating the next available IP address. Do so just to see if there is a DHCP server available to you.
If a DHCP server is not available then you will be prompted for appropriate network information.
Generally you need the following, where some sample addresses are supplied:
IP 220.127.116.11 Netmask 255.255.255.192 Gateway 18.104.22.168 Domain ktware.com DNS 22.214.171.124
The information is recorded in /etc/network/interfaces and /etc/resolv.conf. Later on edit /etc/resolv.conf to add search ktware.com so that you can refer to your local machines by their name, without fully specifying the domain.
# netstat -n # ifconfig -a