Can't surf the internet after a successful VPN connection

[floatingpurr]

Hello, I can't understand what's going on. A friend of mine has just set up an OpenVPN connection this way:

Code: Select all

client
dev tun
remote <MY FRIEND'S IP> 1194 tcp
tun-mtu 1500
tls-client
nobind
user nobody
group nogroup
ping 15
ping-restart 45
ping-timer-rem
persist-tun
persist-key
mute-replay-warnings
verb 3
cipher AES-128-CBC
auth SHA1
pull
auth-user-pass
remote-cert-tls server
redirect-gateway def1
<ca>
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
</ca>

My friend's OpenVPN Server sits behind an internet-facing router, where TCP/1194 is forwarded to the relative port of the OpenVPN Server.

I can set a tunnel up and it works. However, I can't surf the internet. It looks like the traffic is routed through the OpenVPN Server, but then it can't proceed afterwards:

Code: Select all

traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 52 byte packets
 1  192.168.10.1 (192.168.10.1)  3.923 ms  3.574 ms  3.406 ms
 2  * * *

My friend has said to me that she regularly surfs the internet using the same configuration. I tried both from my home Mac, and from mobile (with a different ISP). Tunnel is established, but then I can't navigate.

Any idea about how to troubleshoot this problem?