I have a ZeroTier Network that spans over two LANs in a pretty standard configuration: nodes behind NAT’ing DSL routers.
I’m trying to establish connectivity from various nodes on Network A/nodeA1,nodeA2 to Network B/nodeB1.
From nodeA1 the connectivity to nodeB1 is seamless, all good (nodes have DIRECT connection).
On the other hand connectivity from nodeA2 to nodeB2 doesn’t work. All I see that these peers see each other over RELAY, which shouldn’t be a problem per se, but in this case no packets get through.
I’m hosting the network on my own server.
And the issue was that the my server was running v. 1.8.6 while the peers were already on 1.8.10, upgrading the server to latest solved the issue.
I solved the issue while writing down the problem…