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Why is the non-Nebula site to site VPN tunnel not stable?
Via logs, we can find that the tunnel is establish for a few seconds then disconnects, immediately.
NSG uses connectivity check to the peer site LAN interface, to check if the tunnel is still alive or not.
In private subnet, if the remote policy is 192.168.35.0/24, then the NSG will ping to 192.168.35.1, if it is not your peer site LAN interface then the tunnel will disconnect, due to not receiving any response.
For instance, if your peer site LAN interface IP is 192.168.35.254, please fill out 192.168.35.254/24 instead of 192.168.35.0/24
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