I'm running devuan Jessie on my 32-bit i686 laptop, having installed
long ago from the alpha2 release and doing routine upgrades ever after.

Occasionally I get wrong DNS lookups because of occasional DNS
misconfigurations elsewhere, and they get into the DNS cache.

Yes, get the misconfigurations fixed, of course, but then,

How can I clear them from the DNS cache on my laptop? They tend to hang
around for quite a while.

-- hendrik