[Pkg-utopia-maintainers] Bug#693512: Bug#693512: network-manager: Network manager does not remove default routes

[Michael Biebl]

On 18.11.2012 13:29, Miguel A. Rojas wrote:
> # The primary network interface
> allow-hotplug eth0
> iface eth0 inet static
>          address 192.168.2.2
>          netmask 255.255.255.0
>          network 192.168.2.0
>          broadcast 192.168.2.255
>          gateway 192.168.2.1
>          # dns-* options are implemented by the resolvconf package, if 
> installed
>          dns-nameservers 85.62.229.131 85.62.229.132
> -------------------------------------------
> 
>      As you may see, after networkmanager installation, 
> /etc/network/interfaces was not modified (I do not know if this is the 
> default behaviour). I managed to enable interface managed according to 
> http://wiki.debian.org/NetworkManager#Enabling_Interface_Management. 
> After doing that, networkmanager was able to manage the interface and I 
> suppose it got the information from /etc/network/interfaces.
> 
>       Let me know if you need anything else from my side. I really do 
> not know where this route is coming from. Perhaps I did something wrong 
> in the procedure, but I just followed the standard manuals.

So, the problem is basically this:
You have eth0 configured in /etc/network/interfaces.

This device is now configured *both* by ifupdown and NetworkManager if
you set managed=true. So I actually do not recommend that as maintainer
of network-manager (contrary to what the wiki says).
So, if you want to manage eth0 with NetworkManager it is better to
remove the (eth0) configuration from /etc/network/interfaces completely,
so ifupdown does no longer touch it.

Now, while NetworkManager does not enable a ethernet interface if there
is no network link, ifupdown does not care.
It simply runs "ifup eth0" during boot.
This is why your eth0 network device is brought up and you have this
route entry.

So, in summary, I don't think there is actually a bug in
network-manager. It's just the way what happens if you configure your
system to use managed=true.

Andrew, do you have a better idea how to handle this situation?
Could ifup/ifdown be changed to check if managed=true is set and not
configure the device in this case?

Michael

-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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