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The principles of keeping your servers secure are quite simple.
In no order of priority:
Keep your software up-to-date. (Related: run only supported/maintained versions.)
Run only the services you need.
Install only the software you need.
Configure your software correctly.
Grant access based on the principle of least privilege.
Add monitoring.
Establish a ...
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I found the solution. I just need to add a postrouting and forward chain rule from tun1 to tun0.
iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE
iptables -A FORWARD -i tun1 -o tun0 -j ACCEPT
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Seems like this question was already answered on stackoverflow.
https://stackoverflow.com/a/65930983/7845355
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