OpenVPN DNS Problem While Using Windows 10 Mobile Hotspot

gil_happy

Hello,

I seem to be having a Windows 10 DNS problem when using OpenVPN. Here is the scenario:

- When I connect my Windows 10 PC to a Wifi connection and then turn on the Windows 10 mobile hotspot, both my Windows PC and my tablet connected to the Windows 10 mobile hotspot can surf the internet without a problem.

- However, as soon as I open OpenVPN (2.4.7-I607-Win10) and connect to my VPN, the Windows PC is unable to surf the internet (www.yahoo.com), but I can successfully ping 8.8.8.8. The tablet does 'not' have a problem surfing the internet.

Any idea of why I'm unable to surf and how to fix? I was thinking it was some kind of DNS problem since I was unable to ping any website address.

Any help is greatly appreciated.

Thanks in advance!

gil_happy

Hi, after a few months off, I want to revisit this one and see if I can get any traction. If you look the attached diagram, you can see the exact setup and what the problem is:

I'm guessing either a DNS or a routing problem. Please let me know if you have any questions.

Thanks!

gil_happy

I should have added that the Windows 10 laptop can connect to the DDWRT OpenVPN TAP server with no issues when the 'Mobile Hotspot' is turned 'OFF'.

TinCanTech

gil_happy wrote I want to revisit this one and see if I can get any traction

Nothing of tractionable value so far ..

As a suggestion, you may try filling in these blanks:
https://forums.openvpn.net/viewtopic.php?f=30&t=22603#p68963

help on the afore mentioned:
https://forums.openvpn.net/viewtopic.php?f=30&t=22603#p93575

gil_happy

client
dev tap
proto udp4
remote ddns-name.com 443
nobind
persist-key
persist-tun
remote-cert-tls server
auth-nocache
verb 4
float
comp-lzo no
tun-mtu 1500
auth SHA256
cipher AES-256-CBC
ca ca.crt
cert DDWRTClient.crt
key DDWRTClient.key
route 0.0.0.0 128.0.0.0 vpn_gateway
route 128.0.0.0 128.0.0.0 vpn_gateway
route ddns-name.com 255.255.255.255 net_gateway

gil_happy

Hello all.... I would like to revisit this issue and see if we can get it all fixed up and working. It appears that the issue has slightly changed from before:

- When I connect my Windows 10 PC to a Wifi connection and then turn on the Windows 10 mobile hotspot, both this Windows PC and a tablet connected to the Windows 10 mobile hotspot can surf the internet without a problem; this is working as expected.

- Then, when I open up OpenVPN on my Windows 10 PC and connect to my DDWRT 'TAP' VPN server, the Windows PC does and can connect no problem to the VPN and has the public IP of the home VPN server. However, the tablet that is connected to the Windows mobile hotspot Wifi can surf the internet no problem, but the issue is that the tablet does not connect through the VPN (the tablet does not connect or get an IP address from the VPN server)

TinCanTech

gil_happy wrote the tablet that is connected to the Windows mobile hotspot Wifi can surf the internet no problem, but the issue is that the tablet does not connect through the VPN (the tablet does not connect or get an IP address from the VPN server)

Because you need to run Openvpn on the tablet also.

gil_happy

Thanks for the quick reply..... the idea is that once the Windows PC connects to the VPN, and the hotspot is enabled on that same Windows PC, that any CPE device that connects to the hotspot will connect / route through VPN connection (so need to run OpenVPN on the tablet).

Also, the slight update is that the Windows 10 PC does connect to the VPN without issue, and the CPE can now connect to the hotspot and surf (but it is only from the local IP). Hopefully that makes sense?

TinCanTech

gil_happy wrote the idea is that once the Windows PC connects to the VPN, and the hotspot is enabled on that same Windows PC, that any CPE device that connects to the hotspot will connect / route through VPN connection

Good luck!

OpenVPN is good but it is not magic.

If all else fails then my email is tincanteksup <at> gmail dot com (Fees will apply)

300000

You can use routingandremote access to do that. It is quite simple to make it work . The same as ip forword and MASQUERADE .

It is depend on which version if Windows you use. But the same thing and you need config your openvpn client active as openvpn server so this will do the thing you like