1. Setarea ip-ului ca static / dynamic

ifconfig - afiseaza datele de retea atat pentru loop cat si pentru eth( ifconfig eth0 )

sudo nano /etc/network/interfaces

Ca ip-ul sa fie - static : iface eth0 inet static - dinamic: iface eth0 inet dhcp

Ca setarile sa aibe efect trebuie restartata interfata de retea :sudo /etc/init.d/networking restart (nu merge pe UBUNTU 14.)sudo ifdown eth0 apoi sudo ifup eth0

Se verifica daca setarile s-au incarcat cu comanda ifconfig

Pentru a sterge fereastra se foloseste comanda clear

2. Setarea unui server DHCP

cd /etc ls cd dhcp ls ( -l ) sudo nano dhcpd.conf

sau direct

sudo nano /etc/dhcp/dhcpd.conf - deschide fisierul cu configuratia

Pentru a iesi crtl + x si se salveaza modificarile

sudo /etc/init.d/isc-dhcp-server start ( stop , restart ) - pentru a porni/ opri/ restarta serverulsudo tail /var/lib/dhcp/dhcpd.leases

Pentru a sterge fereastra se foloseste comanda clear

3. IP aliasing

IP aliasing is the process of adding more than one IP address to a network interface. Typical uses of IP aliasing are virtual hosting of Web and FTP servers.  It is fairly simple to set up an IP alias. You merely have to configure the network interface on the system to listen for the additional IP address.

Below are the steps for configuring IP alias under Ubuntu Linux:If you want to put IP alias on an interface, first find the interface, use command

ifconfigOpen the file - /etc/network/interfaces and add the following entries (here we are adding 2 IP aliases)

auto eth0:1

iface eth0:1 inet static

address 192.168.1.10

netmask 255.255.255.0

broadcast 192.168.1.255

network 192.168.1.0

gateway 192.168.1.1

auto eth0:2

iface eth0:2 inet static

address 192.168.1.11

netmask 255.255.255.0

broadcast 192.168.1.255

network 192.168.1.0

gateway 192.168.1.1

You need to enter all the details like address,netmask,network,broadcast and gateways values after entering all the values save this file and exit.

Read more: http://linuxpoison.blogspot.ro/2011/09/configuring-ip-aliases-under-ubuntu.html#ixzz3NnBdbn3l