About tethering

I am trying to connect a Thinkpenguin router to a X60s by tethering iPhone.
I have succeeded in it before, it was like:

iPhone > (Wifi) > TPE-R1200 > (a LAN cable) > X60s

Although I was configuring it randomly,
I succeeded in tethering and it has worked well. But since about a week ago, I have not succeeded in tethering in this way. Two dongles (both AR9271) generally work well after I deleted verbose configurations on Indicator Applet Complete (iPhone1, iPhone2, iPhone3, ethernet1, 優先接続1, etc). It is like:

A dongle > (USB port) > X60s

But I would like to use the router. I don't still understand its concrete benefit though.
Would you teach me a basic simple setting/configuration of tethering?
I would like this:

1. iPhone > (Wifi) > TPE-R1200 > (a LAN cable) > X60s

or

2. iPhone > (USB cable) > TPE-R1200 > (LAN cable) > X60s

or I do not want to use the dongles very much though,

3. iPhone > (Wifi) > TPE-R1200 > (Wifi? Ad-Hoc? anyway radio) > a dongle > (USB port directly) > X60s

I have followed an instruction page of OpenWRT but failed (IIRC, dpkg did not work in a terminal).
LibreCMC and Trisquel seems to have no documents about tethering.

Thank you very much in advance.