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Virtual private networks / Wireguard: OpnSense to VPS: 0 bytes received

« on: April 15, 2022, 05:35:11 am »

I'm attempting to configure Wireguard to route traffic from a VPS to Wireguard on OpnSense. I previously had the road warrior wiregaurd setup but have since removed that. I'm not looking to route outgoing traffic through wireguard, just get incoming traffic from the VPS to route to the configured interface where I can then add firewall rules to access specific vlans, hosts, and services mostly through a reverse proxy.

After lots of debugging I'm not sure why the connection doesn't work.

I've verified that from OpnSense I can reach the public IP of the VPS and the UDP port with nc but the OpnSense Wireguard never completes a handshake.

What else should I be looking at to figure out why OpnSense cannot create the Wireguard tunnel to the VPS?

OpnSense: nc

Code: [Select]

nc -z -v -u <vps public ip> <vps wireguard port>
> Connection to *** 55298 port [udp/*] succeeded!

OpnSense: List Configuration

Code: [Select]

interface: wg0
  public key: ***
  private key: (hidden)
  listening port: 55398

peer: ***
  endpoint: ****:55298
  allowed ips: 192.168.100.0/24
  transfer: 0 B received, 24.71 KiB sent
  persistent keepalive: every 25 seconds

OpnSense: Handshakes

Code: [Select]

wg0 *** 0

VPS: wg

Code: [Select]

interface: wg0
  public key: ***
  private key: (hidden)
  listening port: 55298

peer: ***
  allowed ips: 192.168.100.2/32