&gt; 1) It fails safe. Virtually all device misconfigurations result in failure to pass traffic, rather than being passed accidentally.<p>I don&#x27;t see that, nor that it would even be an advantage.<p>&gt; 2) You get full control of your external signature (at that protocol level). When Comcast and AT&amp;T realize that they can charge for more than a single &#x2F;128 on their consumer networks we&#x27;ll see a lot of wailing and gnashing of teeth on &#x2F;r&#x2F;technology, and it will be completely inane to those of us that saw the same companies attempt the same BS with NAT detection in the late 90s.<p>How do you prevent people from coming up with stupid ideas by implementing some stupid ideas yourself? Is that a general rule you follow? Wherever companies could conceivably some day screw up some product, you do it for them now?<p>&gt; 3) I would like to be able to implement dual stack in networks that I&#x27;m responsible for with as much similarity as possible. Having to reason independently more than needed about how IPv4 and IPv6 behave is needless difficulty.<p>So, you prefer to keep things broken forever if that means that things don&#x27;t change?<p>&gt; 4) IPv6 allocations today are asininely large. We&#x27;re going to have 30-45 years of overallocation and then be out again,<p>What&#x27;s your evidence for that? Seems like a completely baseless claim to me.<p>&gt; and in the interim we&#x27;ll have a whole host of new braindead protocols in the manner of FTP and VOIP.<p>So, NAT is good because protocols that don&#x27;t work well with NAT are braindead because they don&#x27;t work well with NAT?<p>I mean, I see your point if there is any risk that we might run out of addresses, but if we don&#x27;t, what exactly is braindead about those protocols?<p>&gt; 5) If it&#x27;s a useful tool, by the user&#x27;s estimation, why can&#x27;t I have it?<p>You obviously _can_ have it. Just as you _can_ cut your head off if you think that&#x27;s useful to you.<p>But all things considered, do the advantages actually outweigh the disadvantages.