Please read the question carefully, I’m behind ISP NAT, there’s no way to access my system directly from the Internet.
It’s Oracle, that’s the catch
On a serious note, they are known to randomly close servers and accounts of the free tier
domain mapping
If you already have a DNS service then you can ignore Hurricane Electric.
You should not need any TCP rules, as Wireguard uses only UDP. Below are my rules, with the IP address and port number changed. You will need to modify to match your UDP port and IP address setup in your wg0.conf file. Under my network security rules on the Oracle cloud account, I have created the ingress rule for Wireguard
state: no, source: 0.0.0.0/0, IP Protocol: UDP, Range: All, port: 51111
My PostUp rules are:
PostUp = iptables -t nat -I POSTROUTING -s 192.168.2.0/24 \
-o ens3 -j MASQUERADE
PostUp = iptables -I INPUT -p udp -m udp -m conntrack \
--ctstate NEW --dport 51111 -j ACCEPT
PostUp = iptables -I FORWARD -s 192.168.2.0/24 -j ACCEPT
PostUp = echo 1 > /proc/sys/net/ipv4/ip_forward
I’m sorry I just stood up and drinking my coffee. ISP NAT is not a problem for DDNS (that kinda was the reason it was invented). You just need to open a port on the modem for your VPN to pass through.
Conclusio: You somewhere on the planet → WG VPN → NoIP hostname → target IP-address → Modem (has WG port forwarded) → Pi (running PiVPN)
That sounds awesome. Thanks.
I guess Contabo is going to lose a subscriber next month 
I’m reading through the FAQ on their site, but I couldn’t find if there are any outbound bandwidth quota? Is there any? I briefly saw something like 10TB, is that correct?
Ayoo bro it was 3 years ago
Contabo
Doesn’t surprise me
10TB egress to anywhere, unlimited ingress. 100GB block storage. 2 instances. Best always free tier in the industry.
I remember paying Google every time a user in China portscanned me because egress to China wasn’t included in the (tiny) free allotment. What a pain.
Exactly the information I’m looking for. Thanks so much!
does VPN connectivity downloads to local PC also charge in outbound data transfer (10 tb)?
I thank you for your input nevertheless!
Sure, the connection from the VPS to your PC is outbound.