DNETMAP extension is not available on the current FW. However, a new FW for RUTX should come out very soon (in a few days time, depending on the success of testing) and it will support DNETMAP.
New firmware files for RUTX11 are uploaded here when available.
Not sure. I can share a test version that contains all the features of the upcoming version. But is not yet fully tested and thus is not considered stable.
Here's the download link. But use it at your own caution. When the official release comes out, I recommend upgrading again.