[Nottingham] How to remote diagnose network issues?

Paul reclusivegeek at yahoo.co.uk
Mon Sep 7 11:18:15 UTC 2015

Hi Jason,

I have not been following the thread for sometime but I am just 
wondering why your using SSH and not a VPN. I use openVPN to manage a 
large estate of systems through out Europe and I have to say it has 
proved very reliable and secure for many years.

I guess I am missing something ?


On 06/09/15 23:06, Jason Irwin wrote:
> I am trying to have a RasPi create a a reverse tunnel to a server so I 
> can manage it. This should be simple enough. For some reason I have 
> not yet been able to determine, the connection keeps dropping out. 
> Even with autossh.
> My first problem is, what has replaced /etc/network/if-up.d/ in systemd?
> I know systemd defines things differently, but no amount of searching 
> has given the the answer to "How to get systemd to run a script when 
> the network is up".
> Next is, how do I figure out *why* the connection drops? I've got 
> autossh dumping its error messages to a log file that remains 
> annoyingly empty, I just don't get it. I've run this same thing 
> (autossh -f /path/cert -R 1234:here:22 foo at bar) numerous times and it 
> just, well, works! Only thing different in this case is that the RasPi 
> is on a VPN that can hiccup (which the Pi detects and restarts). Thing 
> is, with autossh, I would expect it to re-connect back to me one the 
> Pi has finished slapping ithe VPN around (regardless of any systemd muck).
> Internet connection to the location is also woeful, so any video 
> chat/desktop share is fraught; or I'd use TeamViewer or something 
> access Cygwin on a local lappy. Luckily there is an IT adept out at 
> the location for the next few days.
> Any help gratefully received!
> J.
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> Nottingham at mailman.lug.org.uk
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