Ethernet has always been a point of failure as much as Telephone lines have been in the past. Except for Ethernet it is usually less drastic as many networks are not physically accessible to the elements. Like ours, where we have two external WDS routers that are point to point 1/2 miles distance in between, with a power transformer connected to a house on one end that loves to be struck by lightning . . .;)
On Mon, May 16, 2016 at 6:07 PM, Super Twang <[email protected]> wrote: > @Graham > Wow! I hadn’t yet thought of Ethernet as a point of failure. Apart from > the (“It doesn’t always soft-reset" issue — see outline I.B.1.b) I’d guess > you could solve this with the onboard watchdog timer. Run some kind of > daemon that periodically “Checks for good ethernet” (a bit vague, I know), > if found, it tickles the watchdog, if not, it provokes a reboot. But yes, > the problem remains that the reboot doesn’t always complete. > > Of course if your ethernet got fried, that’d turn into a reboot cycle > without some logic to notify you of the problem, and stop after a number of > cycles. > > > > On May 16, 2016, at 7:56 PM, Graham <[email protected]> wrote: > > It all depends on what you are worried about. > > I have several BBBs that I use as servers, and I want them to be robust. > > So while working through power backup and an external hardware watchdog > per all the previous discussions, we have a thunderstorm roll through the > area. > > No close strikes, but the Ethernet network interface went catatonic, would > not send or receive, but didn't throw any errors. > > I could not SSH into the command line. > > But the local serial port/command line worked fine. The kernel seemed to > be happily running, and not worried about anything in particular. > > The system logs looked like someone had disconnected the Ethernet cable > during the storm, but the network was still physically connected, with the > RJ-45 socket lights blinking. > > A power cycle reestablished everything. > > So, probably some kind of transient flipped a few configuration register > bits and stopped the Ethernet interface. > No physical damage. > > This kind of thing can not be unique, because I note that there are > Ethernet controlled power strips with "Auto-Ping." > Stated feature is “Auto-Ping” feature to intelligently reboot a locked-up > AP, router, VoIP phone, server, camera. or other device automatically. > > Web Power Switch 7. http://www.digital-loggers.com/lpc.html > > So either I can go buy a $115 smart AC power switch, or use an > Ethernet-PIC instead of the MSP430. > > --- Graham > > == > >> >> > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/RaFm9AT7-2c/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/47e04409-af30-4c62-9b3b-445a82036380%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/47e04409-af30-4c62-9b3b-445a82036380%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/AA5B0956-374D-45E8-9336-22899699F9E7%40gmail.com > <https://groups.google.com/d/msgid/beagleboard/AA5B0956-374D-45E8-9336-22899699F9E7%40gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORrFS7Ayqy7H7nQ0FJtkiMvyuU05OK3fBkBUpO_aazSz%2BA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
