Hi again...Well maybe I should make this a bit more clear. I don't think this is a "DNS Problem" per-say but rather a problem with the "Obtain DNS Server Address Automatically" operation and Second Life Teleports and Boundary crossings. In the LL blog post " Darn Teleport Disconnects" they wrote "(it seems to be a timing-sensitive failure in the hand-off between one simulator and the next)." I think it's possible that using "Obtain DNS Server Address Automatically" can create a "timing-sensitive failure" and that using your own, set, DNS servers is more direct, faster and timing-sensitive.
A bit of history...
In the past I was using a slow WIFI connection and would often be disconnected trying to Teleport. (Exactly what is going on now.) I thought that maybe using different, fixed DNS servers ( "Use The Following DNS Server Address" ) might speed up my internet a bit, in general. I wasn't even thinking about Teleport Disconnects at the time, or trying to fix it. I just wanted a little quicker Internet. Well... I then started to notice that I was never being disconnected trying to TP. Well this is interesting, so I went back to "Obtain DNS Server Address Automatically" and the Teleport Disconnects came back...Just like before. So, I return to using "Use The Following DNS Server Address", and again, never being disconnected trying to Teleport.
Fast Forward (Teleport) to today...
I have recently gotten a Fiber Optic internet connection (1000mbps... OH thank God!... lol) And thinking that with this new high speed, super fast connection, I shouldn't have any problems what so ever. So... I changed it back to "Obtain DNS Server Address Automatically" and guess what started to happen?.... Yep, I was getting disconnected trying to Teleport, just like everybody else...Just the same way in the past. So...I returned to "Use The Following DNS Server Address" and guess what?... Yep, I haven't been disconnected Teleporting yet....Just like in the past...Just Saying 😜
So... once again, I don't think this is a "DNS Problem" per-say but rather a problem with the "Obtain DNS Server Address Automatically" operation and Second Life Teleports and Boundary crossings.
What I use to get open, fast and reliable DNS servers is a neat free program called DNSBench https://www.grc.com/dns/benchmark.htm