Disabling host key checking on LAN

[Walter Carlson]

If I want to specify for LAN addresses that I don't want to deal with host
keys, how do I do that?  Understanding the risks, knowing almost everyone
will say not to do this - it's a horrible idea, but deciding I want to do
it anyway.  Tired of having to remove entries from known_hosts with the
multiple VM's I have that often change fingerprints, and am willing to live
with the risks.

/etc/ssh/ssh_config
Host 192.168.*.*
   StrictHostKeyChecking no
   UserKnownHostsFile /dev/null

or
   UserKnownHostsFile none

Isn't doing the trick.  With no known_hosts file in ~/.ssh or /etc, I still
get:
The authenticity of host '<hostname> (192.168.2.2)' can't be established.
ECDSA key fingerprint is SHA256:.....
Are you sure you want to continue connecting (yes/no)?