On Sun 25 Nov 2018 at 07:34:04 (+0100), john doe wrote: > On 11/25/2018 3:05 AM, David Wright wrote: > > On Sat 24 Nov 2018 at 12:25:20 (-0500), Gary Dale wrote: > >> On 2018-11-23 8:25 a.m., Luciano Andress Martini wrote: […] > >>> Just changed 10.5.0.2 to 10.5.0.3 > >>> > >>> #ifdown enp0s3 > >>> #ifup enp0s3 […] > >> My own two cents on the problem is that Interfaces is meant to define > >> how the network is brought up, not to change a running network. If you > >> want to change a running network, use ifconfig or ip to change the > >> address. e.g. ifconfig enp-s3 10.5.0.3 should work since all you are > >> changing is the ip address. > > > > I can't see any advantage in this as you have to do all the grunt work > > yourself instead of letting ifdown/ifup do it for you. For example: […] > > I set up two static alternatives, one using the same address (13) as I > > get from the router, and one wacky one (213) in the "intruder" range: […] > > (the rest of each file is unchanged from the normal one). > > > > Running a script like: > > > > #!/bin/bash > > ifdown enp0s14 > > cp /etc/network/interfaces-static-213 /etc/network/interfaces > > ifup enp0s14 […] > > TL-DR. > > Instead of using the cp command, one could use mapping stanza: > > http://manpages.ubuntu.com/manpages/bionic/man5/interfaces.5.html#mappings
You might, I suppose, if you were setting this up as a permanent solution. As a worked example of (a) the correct order for the operations and (b) the extra leverage obtained by using the appropriate higher level commands, I would have had to edit the /e/n/i file itself, adding an unnecessary layer of extra complication. As it is, by typing: # rm -i /etc/network/interfaces-*¹ /root/to-*² all my experiment's files have been removed, leaving just the trace evidence in my logs. But by all means post a working example here. Following the documentation in man interfaces is obviously difficult for many people, judging by the examples that sometimes get posted. ¹ the two nonce files and a copy of the original /e/n/i. ² the change-overscripts; typing the commands themselves won't work when you get disconnected halfway through the process. Cheers, David.
