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I want to have the wired interface simultaneously obtain a DHCP address, and also alias a fixed address so I can communicate with a device with a fixed IP address on a different subnet over the same link.

When searching for IP address aliasing in Ubuntu, I found this article How do I add interface aliases using Network Manager GUI?. Unfortunately, the Edit Connections GUI in Ubuntu 14 does not have the "additional addresses" button.

Where has this functionality moved?

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I have updated that answer with another screenshot, see if it helps. But at any rate, I don't think the GUI allows you to have a DHCP and a static address at the same time - multiple static addresses are fine. – muru Feb 14 '15 at 17:27
    
Correct - I tried setting it to manual, adding my static address and switching back to DHCP. Doing so deletes any manual addresses. – tim11g Feb 14 '15 at 18:05
up vote 18 down vote accepted

Skip the gui and do it via command line.

The following link provides detailed information on how to create the alias on a temporary basis, as well as how to edit the interfaces file to make the change permanent.

http://www.cyberciti.biz/faq/linux-creating-or-adding-new-network-alias-to-a-network-card-nic/

Information from site in case of site death:

ifconfig command line

You can use ifconfig command to configure a network interface and alias. For example:

  • eth0 NIC IP 192.168.1.5
  • eth0:0 first NIC alias: 192.168.1.6

To setup eth0:0 alias type the following command as the root user:

# ifconfig eth0:0 192.168.1.6 up

Verify alias is up and running using following command:

# ifconfig -a

# ping 192.168.1.6

However, if you reboot the system you will lost all your alias. To make it permanent you need to add it network configuration file.

# vi /etc/network/interfaces

Append the following to the file (This is in addition to existing information, not a replacement for it)

auto eth0:1
iface eth0:1 inet static
name Ethernet alias LAN card
address 192.168.1.7
netmask 255.255.255.0
broadcast 192.168.1.255
network 192.168.1.0

Save and close the file. Restart the network:

# /etc/init.d/networking restart
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Thanks! the "ifconfig eth0:0 192.168.1.6 up" command works great. I don't need it to persist, so that is a perfect solution. – tim11g Feb 14 '15 at 18:11
    
Just note: ip utility is now recommended way to manupulate interfaces ( serverfault.com/a/458639/115256 ). Here's the HowTo: askubuntu.com/a/547297/53738 – dess Jul 8 '15 at 5:50
    
Why is there no gateway entry in the config above? – Colin 't Hart Jun 1 '16 at 9:47
2  
@Colin'tHart: you can only have one "default gateway" (there are special cases, but that is another story), so if the "main" network config already have a gateway, you should not put any in this alias. If the "main" network have no gateway, you can add in the alias the gateway, specially if it is related to this ip range – higuita Jul 13 '16 at 13:37

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