Support for VPN servers added in Route10 firmware versions 1.3p and 1.3l:
Edit: @quackers pointed out that the question was about clients, so the above comment did’nt add much to the conversation. 
Support for VPN servers added in Route10 firmware versions 1.3p and 1.3l:
Edit: @quackers pointed out that the question was about clients, so the above comment did’nt add much to the conversation.