Re: ifconfig/ ifupdown/ ip -

[David Wright <deblis@lionunicorn.co.uk>]

On Mon 09 Jul 2018 at 11:52:36 (+1000), Zenaan Harkness wrote:
> So I change between two internet connections from time to time.
> 
> I use /etc/network/interfaces ("/e/n/i")
> 
> When I modify /e/n/i , I then run a little "reset" script, like so:
> 
> dev=eth0
> ifdown $dev
> ifconfig $dev down
> ifup $dev
> 
> Here and there I've had problems.
> 
> Recently I discovered the ip command.
> 
> Apparently, after reconfiguring as above, two IP addresses end up
> attached to eth0 - one for each (staticly configured in /e/n/i)
> ISP network connection.
> 
> So now I am manually running something like:
> 
> ifconfig eth0 down
> ip address del 10.1.1.30/24 dev eth0
> ip address del 192.168.1.30/24 dev eth0
> ip address del fe80::f2de:f1ff:fef7:ea96/64 dev eth0
> ifup eth0
> 
> But this (atm) is a very manual process, and it seems to me that I am
> not taking down eth0 properly, and that I should not have to
> introduce IP address awareness into my eth reset script, just to
> properly reset my eth0 static configuration.
> 
> Any pointers of what I need to read/ what I am missing, would be
> really appreciated.

I use wicd to manage my network, but I wondered if you'd
looked at guessnet which is meant to work with ifup, and
is meant to automate the process. I haven't used it, though.

Cheers,
David.