Re: NetworkManager: network selection

[Dan Williams <dcbw redhat com>]

On Wed, 2015-06-03 at 22:16 +0200, Pieter Cardoen wrote:
> This makes sense! Adapting the routing metric value shall allow me to use WiFi over the mobile connection. 
> I've seen that WiFi connection has a higher metric value than the mobile connection so adapting it may make 
> it work as I want it to. I'll try it tomorrow!

Just checking back in, did this work out for you?

Dan

> Thanks for the help!
> Pieter
>
> > Subject: Re: NetworkManager: network selection
> > From: dcbw redhat com
> > To: pieter cardoen hotmail com
> > CC: thaller redhat com; networkmanager-list gnome org
> > Date: Wed, 3 Jun 2015 10:05:58 -0500
> >
> > On Wed, 2015-06-03 at 08:25 +0200, Pieter Cardoen wrote:
> > > Thomas
> > > Thanks for the reply. It made some things clear. It is for my application not acceptable that the 
> > > NetworkManager just prefers the most recently used network but due to the priority feature, it is 
> > > possible to prefer the WiFi network over a mobile network. However, debian stable doesn't come with 
> > > NetworkManager 1.0. I will try to install this version on Debian Jessie.
> >
> > There are really two kinds of "priority" in NM and they are mostly
> > independent of each other:
> >
> > 1) connection autoconnect when the device is disconnected, which as
> > Thomas said can be modified by the 'connection.autoconnect-priority'
> > property.  This is specific to the device, and all autoconnect decisions
> > are made independently for that device.
> >
> > 2) which device gets the default route and DNS, which can be modified by
> > the ip4.route-metric and ip6.route-metric properties.  This allows you
> > to prefer a specific device for outgoing traffic; so if you want the
> > WiFi to be preferred when WiFi is connected, then you could set each
> > WiFi connection's ip4.route-metric property lower (which means "more
> > preferred") than the WWAN connection's ip4.route-metric property.
> >
> > Does that make sense?
> >
> > Dan
> >
> > > ThanksPieter
> > >
> > > > Subject: Re: NetworkManager: network selection
> > > > From: thaller redhat com
> > > > To: pieter cardoen hotmail com
> > > > CC: networkmanager-list gnome org
> > > > Date: Tue, 2 Jun 2015 21:36:41 +0200
> > > >
> > > > On Di, 2015-06-02 at 20:56 +0200, Pieter Cardoen wrote:
> > > > > I have some questions about how networkmanager selects a network.
> > > > >
> > > > > How does the NetworkManager deamon decide which network to use if 
> > > > > multiple network connections are available?
> > > >
> > > > Hi
> > > >
> > > > when a device is currently not connected, at various instances
> > > > autoconnect hits. For example when you plug-in your cable and carrier
> > > > -detect indicates a link. Or when Wi-Fi scanning indicates new visible
> > > > networks.
> > > >
> > > > So, in that case, NM will search through the non-connected connections
> > > > and choose a candidate to autoconnect.
> > > >
> > > > If there are multiple candidates, the one that was used most recently
> > > > will be used.
> > > >
> > > > > Is it possible to configure preferred networks?
> > > >
> > > > Yes. Such a candidate must have the "connection.autoconnect" property
> > > > set to "yes". This is the default. In nm-applet this is called
> > > > "Automatically connect to this network when it is available".
> > > >
> > > > > Is it possible to configure the NetworkManager to only connect to one 
> > > > > WiFi network and ignore all other free networks?
> > > >
> > > > Yes, set all connection.autoconnect properties of the other connections
> > > > to "no".
> > > >
> > > >
> > > > Since 1.0, there is also a new property "connection.autoconnect
> > > > -priority". You can assign there a number, see
> > > >   nmcli connection show CON-NAME
> > > >   nmcli connection modify CON-NAME connection.autoconnect-priority 1
> > > >   man nm-settings
> > > > If there are multiple autoconnect candidates, those with higher numbers
> > > > will be preferred.
> > > > So, you could set the priority of the connection you prefer to "1",
> > > > leaving all others to their default at 0.
> > > >
> > > >
> > > >
> > > > Thomas
> > >                                     
> > > _______________________________________________ networkmanager-list mailing list networkmanager-list 
> > > gnome org https://mail.gnome.org/mailman/listinfo/networkmanager-list
>