&gt; ...but that doesn&#x27;t mean r16 -&gt; r17 didn&#x27;t make changes you can&#x27;t safely load.<p>Oh yeah. I know. I would <i>expect</i> for some-to-many minor things (like the TCP bug you mentioned), this wouldn&#x27;t be an insane way to do a hot upgrade. Guess one would need to make a close study of the diffs.<p>Regardless, I mentioned the fact that this isn&#x27;t a good idea for any novice who might stumble across this comment months or years hence and get the wrong idea. :)<p>&gt; ...maybe I should just run CARP myself on the hosts...<p>Oh, CARP is so cool. It&#x27;s a bit of a pity that ucarp doesn&#x27;t support IPv6. But, how does CARP replace a load balancer? Isn&#x27;t it used for single host availability, or is my understanding too narrow?