Hi - whilst I am not running Tomato on my RT-N66U I am running Asuswrt-merlin which uses a complete code pickup of Tomatos OpenVPN code.
I have an OpenVPN Client configured and the tunnel comes up fine but it also writes a default route to the routing table even if I have "Redirect Internet Traffic" turned off.
I have tested using the same keys and certs and config on a software based client on OSX (Viscosity) and the split tunnel works fine.
I was wondering if any Tomato users experience the same. The next step is to configure my old RT-N16U with Tomato and try the same config on that.
I have also posted more detailed diagnosis here:
forums dot smallnetbuilder dot com/showthread.php?t=9091
Any help would be appreciated.