Hi,

Our re-engineered Minster Music and Bells system has now been redeployed and 
has been working in anger (sort-of) since Monday when WMT re-opened to the 
public.  There were one or two teething problems which I was able fix by 
logging in to the system remotely.

However, I've been experiencing a recurrent issue with network access.  For 
the third time this morning I found that I was unable to log into one or other 
of the two Pis in the system and connectivity was only restored after a power 
cycle.  Apart from being inconvenient, this is concerning because I'd like to 
be able to shut the system down before removing the power.  Also, since I am 
still not visiting the WMT due to my wife's vulnerability to COVID I have to 
phone in and ask the duty manager to do it.

The network architecture is a bit unusual in that we didn't want the expense 
of an extra Network Switch and USB/Ethernet Adaptor.  To solve the former I 
configured one Pi as a Router and to solve the latter I used USB Networking, 
which the Pi supports.  Here is a quick and dirty diagram:

    WMT                      Music                              Bells
 Network-------------------Pi---------------------------Pi

      ^                                ^                                  ^
      |                                |                                  |
Accessed                Accessed                    Accessed
    via                             via                              via
   VPN                      Ethernet                       USB0

USB Networking was described to me at:

https://www.raspberrypi.org/forums/viewtopic.php?
f=36&t=295221&p=1785228#p1781380

(There is something in the Raspberry Pi docs, but since the Raspberry Pi 
Foundation redesigned their website, I can't find it.)

Can anyone suggest a reason for these dropouts?                  

-- 



                Terry Coles



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