What's happening? wrong NAT + DNS leak?

[panz]

pfsense box:

WAN
LAN
OPT1 (OpenVPN provider)
OPT2 (OpenVPN road-warrior)

LAN 192.168.1.0/24
OPT1 (assigned to Interface: AIRVPN_INTERFACE)
OPT2 roadwarrior OpenVPN server (assigned to Interface: IPADVPN_INTERFACE): 172.16.0.0/24 –> local 192.168.1.0/24

General Setup > DNS server
2 OpenNIC IPs set here (I don't want to use DNS servers from my provider)

Services: DNS forwarder

Enable DNS forwarder

Do not forward private reverse lookups

Now, the strange problem.

If I browse the Internet from a machine on the LAN (say 192.168.1.40) it's all just fine: all the traffic goes through AirVPN OpenVPN tunnel and http://ipleak.net/ reports DNS from AirVPN and from the 2 OpenNIC servers. Very good.

So, i bring my iPad (with OpenVPN client) and connect to my OpenVPN server on the pfsense box. What I want to achieve is redirect iPad's traffic to AIRVPN_INTERFACE and use that to go out to the Net. But I get this strange output from ipleak

WHAT? I didn't setup any Google DNS!  >:(

Here's my NAT Outbound screenshot

I'm going crazy…