Yesterday I’ve spent the whole night testing speed and connection stability.
Sadly the results are very disappointing, forcing me to drop ZT completely 
… unless, there is a solution to increase connection stability ?
Here are my test results:
- Speed is ca -25% slower than OpenVPN.
- 15MBit/s vs 20MBit/s … 15-17ms vs 10-12ms
(I would not care, if that would be the cost of higher security, just mentioning it…)
-
If pinging with bigger packets ( 20000 bytes):
- experiencing ca 20% Loss ! (ca. every 5th echo)
-
If connecting via TightVNC:
- picture stops, timeout within max 2 minutes
-
RDP connection keeps “reconnecting…”
-
Longer SQL transactions fail, (scrolling through a menu table)
loosing all uncommited data, compete program freeze within 5 sec!
As comparation:
I’ve left the old OpenVPN connection on all the PCs, running side-by-side with ZT.
- no ping-packet drop during the tests,
- no VNC + RDP loss,
- stable SQL queries
Conclusion / reason:
(I write this based on my 30+ years of programmer and system engineering experience on networking + cryptography, but it would be great to be able to see detailed logs.)
IMHO there is some kind of continuous connection re-authentication happening behind the scene on VL1 layer, instead of keeping the connection steady already established.
Short-burst pings are working well, because it takes only 3-12ms to finish, so even if the connection completely dropped and re-established every 2 sec, there is no problem with those.