It appears you want to get on the VPN and another (non-local) network at the same time. If you did that, that would prove the VPN is insecure and well, is not a VPN.
It might be possible to bond networks but look around and you find almost no one will enter into that discussion.
I live in Brazil and in order to have US content on my network like Hulu, I need to have a VPN, the one I use is Astrill.
Here I have an internet connection of 20 MB, and 2 routers, one for my local IP and another one connected to Astrill with my US IP, the hardware I have are these:
ASUS N66U with DD-WRT 18946 v24-sp2 mega connected to Astrill
Airport Extreme (with my Brazilian IP)
Now the problem is that I have a 20Mb speed on my Airport extreme and around 4Mb speed on my ASUS when connected to the VPN and I have 2 wifi networks.
I have connected to the networks my TV, AppleTV, PS3, 2 iPhones, 1 iPad and 1 macbook pro.
Is there anyway to have the IP address from Astrill (US IP) and the speed of my local network in only 1 network (wifi or cable)?
Thanks in advance,