TomatoUSB

I'm using several ASUS RT-16N routers (Easy Tomato .08). They are connected using OpenVPN tunnels. Everything works great over the VPN except for the file transfer speeds using the NAS/Samba file sharing, the most I can get is around 250k. Not using the VPN I can get 8M+ file transfer. I did not expect to get all of that over the VPN, but I had hoped for more. Other programs using the VPN connection can get up to a 1m transfer rate. The internet connections on both ends should not be a limiting factor 30up x 30down & 2up x 15down. Are there any setting I can modify to help this issue?

I also setup the FTP with similar results.

How much faster is the Linux client? There is not a consistent number, we have seen it vary from anywhere between 1.5 to 7 times faster. On average, it's around 2 to 5 times faster. However, there also appears to be an inefficiency in Linux's OpenVPN data transfer rate, although much less noticeable than the Windows inefficiency. These Linux and Windows inefficiencies not only limit the bandwidth you achieve to a fraction of potential bandwidth, but they also effectively limit maximum bandwidth to around 85mbps on all tests that we've done. Furthermore, our speed testing methodology has effectively ruled out flaws in the speed testing mechanism itself, so we are virtually 100% confident that the throughput inefficiency lies within OpenVPN's design or the way it interacts with the OS. We have tried varying the MTU (up to 1500) and other config options with no success. We have heard that raising the MTU above 1500 may help improve speeds, but we've also heard that it may cause data transmission issues for many people over the internet (as opposed to a LAN).