Re: Maintaining connection

[Stuart Gathman <stuart gathman org>]

On 03/11/2015 06:23 PM, Dan Williams wrote:
> On Wed, 2015-03-11 at 15:57 -0500, Alex Ferm wrote:
> > Hello, I'm trying to write a python script that resets NetworkManager
> > when the state is not "NM_STATE_CONNECTED_GLOBAL". Does NetworkManager
> > time out and retry automatically during the "NM_STATE_CONNECTING" state?
> > Also, how is the "NM_STATE_CONNECTED_GLOBAL" determined(ie: is there a
> > periodic ping or something?)?
> What's the reason to reset NM when it reports something isn't connected?
> Just to ensure always-on connectivity as hard as possible?  Also, what
> do you mean by "reset", what specific actions are you running to do so?
In general, it would be useful if NM was able to detect that networking 
was hosed and reset things.  How would it know, however? I generally 
ping the gateway manually to check the connection.  Are gateways always 
pingable?  Just checking for a connection is not sufficient - e.g. when 
wpa_supplicant hangs (radio is operational, but incoming and outgoing 
packets have expired key and are discarded).  Microsoft used to ping one 
of their servers.  But that could be a problem anywhere in between the 
PC and their server.