unresponsive host (r pi) until repeatedly pinged
I have a strange networking issue with one of my raspberry pis.
It is running a program which takes images from the camera and then uploads them each night to my NAS.
Sometimes the upload fails due to networking issues. Once this issue (whatever it is) occurs, the only way to get connectivity back to the pi is to (pardon the pun) ping it to death.
See the attached file for ping log showing it took 40 ICMP requests before a reply was sent. I will be investigating whether this is somehow related to my router and/or wireless connections - but given all other devices in the house don't suffer this issue I'm inclined to think there is something about RPi networking which may cause it to go to sleep after long periods of inactivity. Is this something anyone is aware of?
If anyone has any theories on what may be causing this, please share them. I should state at this point that no other changes or network traffic was taking place throughout the duration of this ping test and hence it is not being caused by network congestion/contention etc.