Very slow tcp fallback

Hi! I’m testing tcp fallback of Zerotier and it is occurring very slow for me.

Here is my testing procedure:

  • check that current connection is Direct
  • start continuous ping from member-1 to another member-2 - works fine
  • block outgoing udp traffic on member-1’s router to block direct udp connection
  • ping stops working of course
  • waiting for tcp fallback maybe for 5-7 minutes!!!
  • ping starts working again and I can check that connection is Relayed now
  • if I unblock udp traffic again it goes back to Direct connection maybe just in 15-20 seconds without any ping losses and that’s fine

The question is why does tcp fallback occurs so slow? Is it an expected behavior?


Nobody? Nobody has this problem?

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