This seems like it should be something that I know of the top of my head, but I must not. On leap 15.0 on my laptop, I had updated a few other boxes on the LAN. (over ssh) Upon reboot the IP for the host I had updated changed local server on LAN running ISC dhcpd and bind. (I'm not sure what prompted the change, but it seems like something Linux 5.6.5 related in the way the DHCID TXT string is calculated by the client based on the MAC? - that's for another day)
The updated host and server were both happy with what the new IP was for the updated hosts (simple nslookup confirmed that), but my Leap 15.0 laptop still had the old IP cached somewhere (nscd?) and was unable to reconnect to the remote updated hosts after they were rebooted (I could connect with ssh -Y NEWIP just fine)
So the problem was my laptop still holding the old IPs in cache somewhere. What do I restart or how can I flush the cache so my laptop has the new IP for the client so name resolution works from my laptop? (restart nscd?, some nsswitch command? -- that's where I got stuck) I don't have any other caching daemon running other than what Leap starts by default. So what is the magic utility I need?
(RTFM answers are fine as long as which 'M' is identified `:)`