I am trying to setup a openvpn client on a ER706W-4G and it seems to be very limited.  The first problem is it won't accept a hostname for the remote server only an ip address which rules out the possibility to connect to a remote host that has a dynamic ip address or to a host that uses a cluster of ip addresses for failover.  The second problem is it needs to be locked to a specific wan interface instead of just using the currently active wan interface.