How to reset DNS cache

Proxmox VE shouldn't do any system-level DNS caching, unless you've manually configured some sort of caching local resolver, like systemd-resolved or dnsmasq. What is the content of your /etc/resolv.conf?
 
The content is
Code:
search office.xxx.com
nameserver 10.1.11.254
nameserver 10.1.20.18

I have not configured any caching. As expected, the new IP addresses became visible after some time - therefore I was sure, that there must be some caching somewhere (e.g. nscd)
 

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