On Wed, Feb 15, 2023 at 08:30:08AM +0100, Michel Verdier wrote: > Le 15 février 2023 gene heskett a écrit : > > > gene@bpi54:~$ grep -i bpi54 /etc/hosts > > 192.168.71.12 bpi54.coyote.den bpi54 > > gene@bpi54:~$ getent hosts bpi54 > > fe80::4765:bca4:565d:3c6 bpi54 > > gene@bpi54:~$ ping -c1 coyote (this machines alias in /etc/hosts) > > ping: coyote: Name or service not known > > If coyote is really an alias and not part of domain name give us > grep -i coyote /etc/hosts > > For what you show bpi54 is the short hostname so you need to do > ping -c1 bpi54 > and not > ping -c1 coyote
bpi54 is the machine where Gene is issuing the commands. What we need to see is bpi54 failing to ping some OTHER machine on his local network. I don't know whether "coyote" is such a machine, but if it is then I would have expected to see something like: gene@bpi54:~$ grep -i coyote /etc/hosts 192.168.71.11 coyote.coyote.den coyote followed by a whole bunch of other lines that are false hits, because for some reason Gene used "coyote" as both a local hostname *and* part of his local domain name. Surely there must be some machine on Gene's network which is in the /etc/hosts file on bpi54, and which is not named "coyote" or "den". That's what we want to see. As I said before, it doesn't even have to be a machine that works and responds to pings. It could be a printer that he used in 2003 and no longer exists, but is still in the /etc/hosts file. Anything. That said, I'm curious about this part oF Gene's result: > > gene@bpi54:~$ grep -i bpi54 /etc/hosts > > 192.168.71.12 bpi54.coyote.den bpi54 > > gene@bpi54:~$ getent hosts bpi54 > > fe80::4765:bca4:565d:3c6 bpi54 Where does getent pull that IPv6 address from? That's not what I get when I look myself up: unicorn:~$ grep -i unicorn /etc/hosts 127.0.1.1 unicorn.wooledge.org unicorn unicorn:~$ getent hosts unicorn 127.0.1.1 unicorn.wooledge.org unicorn I don't understand Gene's result. Oh, and one last thing that popped into my head this morning: name service caching daemons. Is it possible that Gene is running nscd or something like it, and that this is influencing his results? It might explain why he felt a need to reboot after changing something.