How do I set a static IP address?

Question

My eth0 is using DHCP to get IP address for Internet. However I still need to set some static IP for my LAN. The following is my setting in /etc/network/interface. Any problem on the script ? I always failed when I try to start network.

I checked the IP via ifconfig. and found eth0:3 is set but others. May I know what's the problem?

  1 auto lo
  2 iface lo inet loopback
  3 
  4 #auto eth0
  5 #iface eth0 inet dhcp
  6 
  7 auto eth0:1
  8 iface eth0:1 inet static
  9 address 192.168.20.222
 10 netmask 255.255.255.0
 11 gateway 192.168.20.1
 12 
 13 auto eth0:2
 14 iface eth0:2 inet static
 15 address 192.168.30.222
 16 netmask 255.255.255.0
 17 gateway 192.168.30.1
 18 
 19 auto eth0:3
 20 iface eth0:3 inet static
 21 address 192.168.211.222
 22 netmask 255.255.255.0
 23 gateway 192.168.221.1   

Solution 1

You don't really need to edit `/etc/network/interfaces' to set the static IP addresses. You can do that using the Network Manager. Just right click on the network applet and go to Edit Connections.

If you however don't want to use the network manager, the following steps will help you assign multiple ip addresses:

1. Disable the network manager sudo service network-manager stop
2. Get the IP address from the server using: sudo dhclient eth0
3. Assign the first ip addresses like this: sudo ip addr add 192.168.20.222/24 dev eth0, and repeat for other IP addresses.
4. Add the default route using: sudo route add default gw <internet gateway ip address>

If you do step 2, step 4 is not required. Hope that helps.

Solution 2

If the problem persists while setting up a static ip, use the following steps to set up a new static ip address:

Open terminal (command line) and type the following command:

sudo vi /etc/network/interfaces

OR

sudo gedit /etc/network/interfaces

Make the changes as follows:

auto eth0
iface eth0 inet static
address 10.10.29.66
netmask 255.255.255.192
network 10.10.29.65
broadcast 10.10.29.127
gateway 10.10.29.65

Save and close the file. Restart networking:

sudo /etc/init.d/networking restart

Solution 3

If you have NetworkManager installed, it could be causing a problem with /etc/network/interfaces. See /usr/share/doc/network-manager/README.Debian (I've used Ubuntu just enough to install it for someone else).

Comments

[Andrea Corbellini]

possible duplicate of How to set static ip address in guest Ubuntu running in Virtual Box

[iAsk]

can network manager achieve some work? I tried to assign static IP in network manager and also failed.

[iAsk]

thanks. I prefer use Network-manager. but when I edit the connection and add two more static ip address and then reboot. Then the ip change to lan only, I lost my dhcp ip address.

[Ben S Nadler]

Well then go with the command line.

[iAsk]

command line is easier, but I need to input password every time. thanks

[Ben S Nadler]

sudo su will relieve you of that trouble.

[iAsk]

sudo su still need input password, how come to relieve the trouble.

[isomorphismes]

@iAsk sudo visudo will solve that askubuntu.com/a/147265/12518