Tailscale won't create a direct connection

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demon_slayer

Discoverer
So I'm facing this weird issue with my tailscale setup.
Device A - macbook - behind ISP(comway) NAT (delhi) - probably a hard nat
Device B - vps in oracle cloud - public ip - udp/41641 open for tailscale
Device C - desktop - behind ISP(airtel) NAT (bangalore) - probably a hard NAT

A can make a direct connection to B which I have always assumed is because B is on a public IP with the tailscale required port open, and hence that's why this is possible.
I added the device C recently and for the life of me, I cannot get it to get a direct connection to B.

Has someone ran into such a issue with tailscale before?
I'm writing this out of frustration in the middle of the night, so might have missed details, please bear with me and do ask me for more
 
So tailscale doesn't require any open ports in oracle vps. I run one and I haven't opened any ports on mine. But that is unrelated to your issue. Just some free advice.

Try using Device C with a different network (say mobile hotspot - which is definitelly NATted) and check if you're able to form a direct connection. Do confirm you're getting an IPv4 address for all devices. Tailscale uses DERP for IPv6 to v4 tunneling.

Also sometimes it may take a few minutes/hours to get a direct connection.

My tailnet sometimes connects via Bangalore DERP before switching over to a direct connection, but atleast in my use case, using DERP hasn't been a bottleneck, hence haven't investigated further.
 
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