Wireguard server - how does a website know I'm using a VPN if I exit from my home IP?

I am running VPN server on my firewalla. I then connect via wireguard to my home network.

My understanding is (and I’ve checked to verify) that my exit IP therefore is always my home IP address.

I frequently get captcha checks and security notifications however – somehow websites know I’m using a VPN even though it’s self.hosted and I’m exiting from my own IP address.

Why does this happen and is there something I can do about it within the firewalla app or my computer?

Thank you for any help.

Did you ever share location via the mobile apps?

Another possibility is your home IP is marked as VPN … do you have the problem?

I ran into an issue where the “local” geolocation could leak via IPv6 when I was testing some VPN options with Firewalla last year. In my scenario, I was using an Apple TV connecting via a local Firewalla, which was tunnelling to another Firewalla in a different location. IPv4 was “transported” fine. I think I tried every variation the GUI seemed to have available, but still never figured out what I was missing. Disabling IPv6 entirely on both sides was certainly not a surgical solution, but it did end up being a functional workaround…

Perhaps the device you’re streaming from and/or your home Firewalla are giving you away in a similar fashion via IPv6?

My best guess is information in a web cookie about your local interface type being forwarded to the website. The local interface type probably shows as a “tunnel” type, instead of Wi-Fi or Ethernet.

Does this happen when you are just at home. I ran a MystVPN server that allowed others to use my ip address to exit, my home IP got marked as a VPN service.

Starting with the basics, when you do a ‘what’s my IP’ search from home does it yield the same IP as when you check away from home?

This happened today on my healthcare providers website (my medical record). They have no app. It’s website only.

Not sure how my home IP would be marked as a VPN, I use frontier fiber and it’s one in their block of IP addresses.

IPV6 is disabled because my ISP does not support it so nothing to gain by having it enabled.

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I am the only one using the VPN - I use it at work and when traveling to have remote access to my network services without opening ports. Nobody else is using.

It seems to happen elsewhere (when I am connected to the VPN server outside my home) as well as when I’m at home (with the tunnel still on).

Yes - I stated that in my original post, I’ve verified my exit point is always my home WAN address.

(and no IPV6 is enabled)