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Change IP address of ethernet device while Ubuntu system is running

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On a computer running Ubuntu 16.04, I am trying to change the static IP address of an ethernet device, while the system is running. Therefore, I edit the file /etc/network/interfaces.d/${IFNAME} and then execute the command 'service networking restart'. But with that, the ethernet device is not switched to the new IP address, but it keeps the old address and gets the "new" address as secondary IP address. In former versions of Ubuntu, with the same steps as above, the old IP address was replaced by the new one.

What do I have to do now to switch the IP address without a reboot?

posted Dec 8, 2016 by anonymous

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2 Answers

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I believe, but am not sure, that you either have to do it via NetworkManager, or remove NetworkManager and either do everything
manually (addressing + subnet masking, gateways, routing, hostnames, &c) or switch to a different tool such as WICD.

answer Dec 8, 2016 by Amit Parthsarthi
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you should never ever do this since this tears out the whole networking stack from the system ... rather run "ifdown $interfacename" and "ifup $interfacename"

if you actually restart the networking stack, loopback devices will be killed/restarted too (along with any daemons providing protocols though localhost etc) ... this can for example cause dbus to restart ... which is a very bad thing on a desktop where apps communicate through dbus.

answer Dec 8, 2016 by Satish Mishra
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