If I want to specify for LAN addresses that I don't want to deal with host keys, how do I do that?/etc/ssh/ssh_configHost 192.168.*.*   StrictHostKeyChecking no   UserKnownHostsFile /dev/nullorUserKnownHostsFile noneeven withCheckHostIP noIsn't doing the trick.  openssh 7.1p1.  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)?This functionality was somewhat recently changed in openssh.  Old questions suggest the ssh_config as shown above, which doesn't appear to work anymore.Yes, this is a horrible idea.  I want to do it anyway.  It risks a man in the middle attack.  It risks connecting to the wrong server if there's a configuration issue.  I'm just 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.  Yes, there's other questions like this, that explain how to do it the right way, but I don't want to do it that way.  I just want to turn it off.
Disabling openssh host key checking on LAN
ssh;openssh
Seems like your solution on openssh mailing list seems to be quite bearable. Reposting also here:Match exec ping -q -c 1 -t 1 %n | grep '192\.168\.'   StrictHostKeyChecking no   UserKnownHostsFile /dev/nullSource: http://lists.mindrot.org/pipermail/openssh-unix-dev/2015-August/034335.html