Where did the idea come from?

• Netflix flagged public IPv4 address from my VPS provider as VPN.
• I want to have the public IPv4 address of my ISP and send through VPN so Netflix won't cause trouble.
• Using WireGuard as the VPN program.

Managed to do it, however

• Other side will route it back to the public IPv4 address of my ISP using the route it knows, which won't go through my VPN.
• Therefore, I won't receive the traffic on the same interface I transmit (transmit on VPN interface, receive on internet interface).

• This will work for servers which only respond to requests.
  • Response traffic will be routed through VPN.

Client Side

• Use a link with public IPv4

• Don't masquerade VPN interface

  • if you do, enable masquerading for public IPv4 address from ISP on the VPN interface

  iptables -t nat -A POSTROUTING -d 31.206.225.140/32 -o wg -j MASQUERADE
  

Server Side

• Put public IPv4 address from ISP on AllowedIPs for the peer

• Delete the rule for the ISP IP from routing table on PostUp

  PostUp = ip route del "IP"
  

• Add another routing table

  ip rule add from "IP" table 10
  ip route add default via "serverGateway" table 10