How do I add an additional IP address to an interface in Ubuntu 14
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?
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.
Correct — I tried setting it to manual, adding my static address and switching back to DHCP. Doing so deletes any manual addresses.
4 Answers 4
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.
Information from site in case of site death:
You can use ifconfig command to configure a network interface and alias. For example:
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.
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 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.
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
@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
In order to add an address temporarily use ip :
ip a add 192.168.178.2/24 dev enx0050b60c19af For example to install OpenWRT on some old devices:
I just learned a trick from my colleague which involve the following:
If say eth_lan0 is set as the name of your wired network and has first been configured with the IP 192.168.1.2 , say with something like netplan , you can then add an alias to connect to another internal network say with an IP with the pattern 10.42.0.x with the following:
sudo ifconfig eth_lan0:1 10.42.0.2 This assumes that the IP 10.42.0.2 has not yet been assigned to your LAN and that your host is connected to both networks, one with IP 192.168.1.x and the other with 10.42.0.x . Check if you have been successful by running ifconfig to see if the alias has been set. Then, it would be recommended to ping the hosts you are trying to connect on the two local networks to make sure everything runs as expected.
Create Multiple IP Addresses to One Single Network Interface
The concept of creating or configuring multiple IP addresses on a single network interface is called IP aliasing. IP aliasing is very useful for setting up multiple virtual sites on Apache using one single network interface with different IP addresses on a single subnet network.
The main advantage of using this IP aliasing is, you don’t need to have a physical adapter attached to each IP, but instead you can create multiple or many virtual interfaces (aliases) to a single physical card.
The instructions given here are applies to all major Linux distributions like Red Hat, Fedora, and CentOS. Creating multiple interfaces and assign IP address to it manually is a daunting task. Here we’ll see how we can assign IP address to it defining a set of IP range. Also understand how we are going to create a virtual interface and assign different range of IP Address to an interface in one go. In this article we used LAN IP‘s, so replace those with ones you will be using.
Creating Virtual Interface and Assign Multiple IP Addresses
Here I have an interface called “ifcfg-eth0“, the default interface for the Ethernet device. If you’ve attached second Ethernet device, then there would be an “ifcfg-eth1” device and so on for each device you’ve attached. These device network files are located in “/etc/sysconfig/network-scripts/” directory. Navigate to the directory and do “ls -l” to list all devices.
# cd /etc/sysconfig/network-scripts/ # ls -l
Sample Output
ifcfg-eth0 ifdown-isdn ifup-aliases ifup-plusb init.ipv6-global ifcfg-lo ifdown-post ifup-bnep ifup-post net.hotplug ifdown ifdown-ppp ifup-eth ifup-ppp network-functions ifdown-bnep ifdown-routes ifup-ippp ifup-routes network-functions-ipv6 ifdown-eth ifdown-sit ifup-ipv6 ifup-sit ifdown-ippp ifdown-tunnel ifup-isdn ifup-tunnel ifdown-ipv6 ifup ifup-plip ifup-wireless
Let’s assume that we want to create three additional virtual interfaces to bind three IP addresses (172.16.16.126, 172.16.16.127, and 172.16.16.128) to the NIC. So, we need to create three additional alias files, while “ifcfg-eth0” keeps the same primary IP address. This is how we moving forward to setup three aliases to bind the following IP addresses.
Adapter IP Address Type ------------------------------------------------- eth0 172.16.16.125 Primary eth0:0 172.16.16.126 Alias 1 eth0:1 172.16.16.127 Alias 2 eth0:2 172.16.16.128 Alias 3
Where “:X” is the device (interface) number to create the aliases for interface eth0. For each alias you must assign a number sequentially. For example, we copying existing parameters of interface “ifcfg-eth0” in virtual interfaces called ifcfg-eth0:0, ifcfg-eth0:1 and ifcfg-eth0:2. Go into the network directory and create the files as shown below.
# cd /etc/sysconfig/network-scripts/ # cp ifcfg-eth0 ifcfg-eth0:0 # cp ifcfg-eth0 ifcfg-eth0:1 # cp ifcfg-eth0 ifcfg-eth0:2
Open a file “ifcfg-eth0” and view the contents.
[[email protected] network-scripts]# vi ifcfg-eth0 DEVICE="eth0" BOOTPROTO=static ONBOOT=yes TYPE="Ethernet" IPADDR=172.16.16.125 NETMASK=255.255.255.224 GATEWAY=172.16.16.100 HWADDR=00:0C:29:28:FD:4C
Here we only need two parameters (DEVICE and IPADDR). So, open each file with VI editor and rename the DEVICE name to its corresponding alias and change the IPADDR address. For example, open files “ifcfg-eth0:0“, “ifcfg-eth0:1” and “ifcfg-eth0:2” using VI editor and change both the parameters. Finally it will look similar to below.
ifcfg-eth0:0
DEVICE="eth0:0" BOOTPROTO=static ONBOOT=yes TYPE="Ethernet" IPADDR=172.16.16.126 NETMASK=255.255.255.224 GATEWAY=172.16.16.100 HWADDR=00:0C:29:28:FD:4C
ifcfg-eth0:1
DEVICE="eth0:1" BOOTPROTO=static ONBOOT=yes TYPE="Ethernet" IPADDR=172.16.16.127 NETMASK=255.255.255.224 GATEWAY=172.16.16.100 HWADDR=00:0C:29:28:FD:4C
ifcfg-eth0:2
DEVICE="eth0:2" BOOTPROTO=static ONBOOT=yes TYPE="Ethernet" IPADDR=172.16.16.128 NETMASK=255.255.255.224 GATEWAY=172.16.16.100 HWADDR=00:0C:29:28:FD:4C
Once, you’ve made all changes, save all your changes and restart/start the network service for the changes to reflect.
[[email protected] network-scripts]# /etc/init.d/network restart
To verify all the aliases (virtual interface) are up and running, you can use “ifconfig” or “ip” command.
[[email protected] network-scripts]# ifconfig eth0 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.125 Bcast:172.16.16.100 Mask:255.255.255.224 inet6 addr: fe80::20c:29ff:fe28:fd4c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:237 errors:0 dropped:0 overruns:0 frame:0 TX packets:198 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:25429 (24.8 KiB) TX bytes:26910 (26.2 KiB) Interrupt:18 Base address:0x2000 eth0:0 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.126 Bcast:172.16.16.100 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:18 Base address:0x2000 eth0:1 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.127 Bcast:172.16.16.100 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:18 Base address:0x2000 eth0:2 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.128 Bcast:172.16.16.100 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:18 Base address:0x2000
Ping each of them from different machine. If everything setup correctly, you will get a ping response from each of them.
ping 172.16.16.126 ping 172.16.16.127 ping 172.16.16.128
Sample Output
[[email protected] ~]# ping 172.16.16.126 PING 172.16.16.126 (172.16.16.126) 56(84) bytes of data. 64 bytes from 172.16.16.126: icmp_seq=1 ttl=64 time=1.33 ms 64 bytes from 172.16.16.126: icmp_seq=2 ttl=64 time=0.165 ms 64 bytes from 172.16.16.126: icmp_seq=3 ttl=64 time=0.159 ms --- 172.16.16.126 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 0.159/0.552/1.332/0.551 ms [[email protected] ~]# ping 172.16.16.127 PING 172.16.16.127 (172.16.16.127) 56(84) bytes of data. 64 bytes from 172.16.16.127: icmp_seq=1 ttl=64 time=1.33 ms 64 bytes from 172.16.16.127: icmp_seq=2 ttl=64 time=0.165 ms 64 bytes from 172.16.16.127: icmp_seq=3 ttl=64 time=0.159 ms --- 172.16.16.127 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 0.159/0.552/1.332/0.551 ms [[email protected] ~]# ping 172.16.16.128 PING 172.16.16.128 (172.16.16.128) 56(84) bytes of data. 64 bytes from 172.16.16.128: icmp_seq=1 ttl=64 time=1.33 ms 64 bytes from 172.16.16.128: icmp_seq=2 ttl=64 time=0.165 ms 64 bytes from 172.16.16.128: icmp_seq=3 ttl=64 time=0.159 ms --- 172.16.16.128 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 0.159/0.552/1.332/0.551 ms
Seems everything working smoothly, With these new IPs’ you can setup virtual sites in Apache, FTP accounts and many other things.
Assign Multiple IP Address Range
If you would like to create a range of Multiple IP Addresses to a particular interface called “ifcfg-eth0“, we use “ifcfg-eth0-range0” and copy the contains of ifcfg-eth0 on it as shown below.
[[email protected] network-scripts]# cd /etc/sysconfig/network-scripts/ [[email protected] network-scripts]# cp -p ifcfg-eth0 ifcfg-eth0-range0
Now open “ifcfg-eth0-range0” file and add “IPADDR_START” and “IPADDR_END” IP address range as shown below.
[[email protected] network-scripts]# vi ifcfg-eth0-range0 #DEVICE="eth0" #BOOTPROTO=none #NM_CONTROLLED="yes" #ONBOOT=yes TYPE="Ethernet" IPADDR_START=172.16.16.126 IPADDR_END=172.16.16.130 IPV6INIT=no #GATEWAY=172.16.16.100
Save it and restart/start network service
[[email protected] network-scripts]# /etc/init.d/network restart
Verify that virtual interfaces are created with IP Address.
[[email protected] network-scripts]# ifconfig eth0 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.125 Bcast:172.16.16.100 Mask:255.255.255.224 inet6 addr: fe80::20c:29ff:fe28:fd4c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1385 errors:0 dropped:0 overruns:0 frame:0 TX packets:1249 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:127317 (124.3 KiB) TX bytes:200787 (196.0 KiB) Interrupt:18 Base address:0x2000 eth0:0 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.126 Bcast:172.16.16.100 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:18 Base address:0x2000 eth0:1 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.127 Bcast:172.16.16.100 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:18 Base address:0x2000 eth0:2 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.128 Bcast:172.16.16.100 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:18 Base address:0x2000 eth0:3 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.129 Bcast:172.16.16.100 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:18 Base address:0x2000 eth0:4 Link encap:Ethernet HWaddr 00:0C:29:28:FD:4C inet addr:172.16.16.130 Bcast:172.16.16.100 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:18 Base address:0x2000
If you having any trouble in setting up, please do post your queries in the comment section.