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My Raspberry Pi 3 b+ will not allow me to ping it even though I've ping'd and ssh'd into it plenty of times before now.

I can ping my main computer from the pi but not the other direction.

ping hostname.local
ping: cannot resolve Hostname.local: Unknown host

If I use ifconfig on my Pi and get the IP address manually, then I can ping it.

ping pi_ip_address.local
PING Hostname.local (pi_ip_address): 56 data bytes
  • This is not a ping problem, it is a DNS problem. – RalfFriedl Apr 10 at 5:14
  • I can (generally) ping my Pi on the local network using hostname.local or IP address. If you cannot this is a problem in your computer or router. Ping by hostname is an ARP issue - this can be a complex issue, but is unrelated to the Pi. Refreshing the arp cache can resolve this issue. – Milliways Apr 10 at 5:34
  • Is your "main computer" a Windows PC? – Seamus Apr 10 at 9:07
  • Do you use static ip addresses? What is the ip address of the RasPi? Please address me with @Ingo, otherwise I won't see your reply. – Ingo Apr 11 at 9:04
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If your "main computer" is Windows, then this is likely the cause of the problem... "the problem" being that Windows seems to have adopted zero-configuration networking a bit differently than Linux and Apple.

Since I'm not sure your "main computer" is Windows I won't speculate further. But if it is, the people at AdaFruit have a couple of unique ideas that may help. Try one of their solutions first, and if that doesn't resolve it, let us know.

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