On 05/17/2016 05:55 PM, William Hermans wrote:
/William:/
/That would work. /
/
/
/The only "edge case" I might see as a problem would be if your
ping target went off line. Then the BBB would reboot itself every
ten minutes even though nothing was wrong with the BBB. I guess
you could ping several different targets in rotation and only
reboot if they all disappeared./
/This gets us back to a real cheap local watchdog./
You only need to ping one ip address. Your internet gateway IP. e.g.
your first hop outside of your local network.
The need to ping an Internet host just adds to the requirements. Pinging
your local router IP would meet the requirement of whether the BBB
interface is up. Adding Internet connectivity just added more complexity.
/
/
/As an aside: Does anyone know what test a computer runs to
determine if it is connected to the internet?/
/Most desktop/laptop computers have a different network icon as to
whether the network/WiFi you connected to has internet
connectivity. Is the Windows computer pinging some Microsoft
location that is "guaranteed" to be up?/
/
/
/--- Graham/
I'm not 100% sure, but the test Windows does is not always correct.
Sometimes the icon shows not connected, when in fact as soon as you
try to surf something on the web, it goes to the working icon . . .
My guess is that it does some simple DNS tests, and then after a while
it gives up checking.
On Tue, May 17, 2016 at 2:29 PM, Graham Haddock <[email protected]
<mailto:[email protected]>> wrote:
William:
That would work.
The only "edge case" I might see as a problem would be if your
ping target went off line. Then the BBB would reboot itself every
ten minutes even though nothing was wrong with the BBB. I guess
you could ping several different targets in rotation and only
reboot if they all disappeared.
This gets us back to a real cheap local watchdog.
As an aside: Does anyone know what test a computer runs to
determine if it is connected to the internet?
Most desktop/laptop computers have a different network icon as to
whether the network/WiFi you connected to has internet
connectivity. Is the Windows computer pinging some Microsoft
location that is "guaranteed" to be up?
--- Graham
==
On Tue, May 17, 2016 at 2:30 PM, William Hermans
<[email protected] <mailto:[email protected]>> wrote:
@Graham,
What I propose is that you do not need an Ethernet Micro
connected to the BBB. Instead, you have the BBB ping the
outside world once every set time frame, and it a ping comes
back unreachable after say 5-10 minutes. You just stop
"kicking the dog". Which does present a potential problem that
Your internet connection may just be down. But a remote system
that reboots once every 5-10 minutes because the internet
connection is down is not something I'd personally see as a
bad thing. After all you're unable to connect to the system
anyway.
==
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