Teredo tunneling is a transition technology that gives full IPv6 connectivity for IPv6-capable hosts which are on the IPv4 Internet but which have no direct native connection to an IPv6 network. At the moment most home systems connected to the internet do not have native IPv6 connectivity and as more websites move to the new system teredo tunneling needs to be used so our IPv4 sytsems can have access and process IPv6 address data.
The limitations of IPv4 mean that over the next few years the world would run out of new internet addresses so hence the move to IPv6. Teredo tunneling is intended to be only a temporary measure: in the long term, all IPv6 hosts should use native IPv6 connectivity. ISP's have a lot of work to do still before this becomes reality though.
The reality is that at the moment you can get away without it. I have IPv6 disabled on my network to avoid confusion with legacy machine equipment, I've never missed it in the slightest... Not saying this won't change in the future though.
Was looking into the nature of this tunneling adaptor initially, at it was showing as an "unsecured internet connection" error message on my Norton Antivirus Suite after the July 14th Win10 update was implemented on my machine- this is despite my Surface Book being plugged into the same, high-speed, secured LAN it always had been (using IPv4 at the moment exclusively).
After reading your post, and knowing quite intimately the impetus behind IPv6, I just was wondering if you could address the following question:
I have a pretty new suite of devices connected to this wired/wireless, home/home office network (ISP- Verizon Fios: 100/100 Mbps connection on their newest, Gen 4 router), with the oldest device being an Amazon Fire TV streaming device... While I have not activated the IPv6 capability on my so-enabled router thus far because it doesn't seem necessary currently for (today's) internet browsing, I do plan on activating it going forward sooner than later, and therefore just wondered what type of legacy problems one could expect from activating this new protocol (as you had referenced above).
Given that both of my PC's are Win10 machines with varying quality, Intel Core processor sets (4th gen i3 on Dell desktop and 6th gen. i7 on Surface Book), and the other devices on my network are all very current in terms of their core technology (possibly with the one exception with my mentioned, Amazon Fire TV streaming device), should I expect that enabling the IPv6 protocol on my router would create any issues for me?
I wouldn't think my up-to-date computers, smartphones and tablets would have any issues with the v6 protocol given their specs and respective release dates, so would these legacy issues you spoke of be more focused on something like an older, wireless and cloud-print enabled printer perhaps? Was just hoping you'd clarify if able, as with the need for IPv6 connectivity becoming imminent, I just would like to know if I should be expecting any issues with my current technology, or if it would likely be limited to a few, older peripherals.
It should be noted that my router will run in dual IPv4 & IPv6 mode with the IPv6 capability enabled, so this further confuses me in regards to your comment, as if an older device couldn't handle the new protocol, would it not simply revert to the working IPv4 designation, so that such things as cloud printing on my older, wireless printer would still not be interrupted due to the dual protocols running (this is how my router explains the dual mode setting when enabling the newer protocol)?
Thanks in advance for any help provided, as like many people, I try to stay current with my technological products and their respective core settings, however not at the expense of their complete, continued functionality!