Hello,
I want to communicate with an iot device over the Internet when I am on vacation. However in order to minimize the risks I want to make sure that this device is the only accessible device and that a potential attacker would be only able to access this device and no other device or the internet if the password is hacked.
How can I achieve this? I think I should probably use a VPN, but which? If you have any recommendations i'd like to hear them.
Yep, set up a VPN, preferably WireGuard:
Thank you for your advice. I was able to successfully setup a WireGuard VPN. However I have a ds-lite connection, therefore I need a portmapper or a similar service to reach my VPN from ipv4. In Germany we have the following service: https://www.feste-ip.net. It roughly costs 5$ per year. However it only supports TCP. Are there any similar cheap services for UDP (because WireGuard works with UDP) or do I need to switch to OpenVPN?
If the client side ISP supports IPv6, then you don't even need IPv4 to establish the tunnel.
Otherwise, OpenVPN over TCP or something like ZeroTier should work too.
I tried installing OpenVPN over TCP. The VPN connection is working flawlessly through LAN. However if I want to connect through ipv6 over the internet it is not working (i have not checked ipv4 yet).
This is my server config:
user nobody
group nogroup
dev tun
port 1802
proto tcp
server 172.16.0.0 255.255.255.0
server-ipv6 2001:db8:f00:bebe::/64
push "route-ipv6 ::/0"
push "route-metric 2000"
topology subnet
client-to-client
keepalive 10 60
persist-tun
persist-key
push "route 192.168.178.0 255.255.255.0"
push "dhcp-option DNS 192.168.178.1"
push "dhcp-option DOMAIN 192.168.178.1"
push "redirect-gateway def1"
push "persist-tun"
push "persist-key"
<dh>
-----BEGIN DH PARAMETERS-----
***
-----END DH PARAMETERS-----
</dh>
<tls-crypt>
-----BEGIN OpenVPN Static key V1-----
***
-----END OpenVPN Static key V1-----
</tls-crypt>
<key>
-----BEGIN PRIVATE KEY-----
***
-----END PRIVATE KEY-----
</key>
<cert>
-----BEGIN CERTIFICATE-----
***
-----END CERTIFICATE-----
</cert>
<ca>
-----BEGIN CERTIFICATE-----
***
-----END CERTIFICATE-----
</ca>
This is the firewall-rule I have created.
Do you have an idea?
The important parts are listed here:
If OpenWrt creates a route for the entire prefix, you can skip the sourcefilter option.
Also skip the ip6class option since it's for the client side.
Specify your domain instead of IP:
And remove that:
Thanks for your help again. It is now working perfectly.
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