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I'm trying to route some traffic through a VPN network via tailscale rather than direct connection to the host. My setup is:

  1. Ubuntu Client with tailscale VPN (Now called C)
  2. Ubuntu Server with tailscale VPN in AWS (Now called S)
  3. MongoDB Atlas cluster in AWS, currently using public IP, later paired to Server with tailscale VPN in AWS (Now called A)

My goal is that C -> A uses the VPN via S.

I tried the following:

  1. Set up three host routes from C to the tailscale endpoint on S.
  2. Use MASQUERADE in nat POSTROUTING to connect from S to A.

Unfortunately the first point is already failing for me. I have tried to log the traffic on S in PREROUTING nat table via LOG all -- anywhere anywhere LOG level warning but I see no traffic going to A at all.

On C and S the ipv4 forwarding is on:

cat /proc/sys/net/ipv4/ip_forward
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As I don't see any requests for IP Addresses in A (Atlas) on S, I think the traffic is never sent to S or swallowed there in one of the many tailscale rules. Any suggestions?

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