I have two of the exact same modem (longer story, unimportant): Sagemcom f@st 3864v3
I would like to convert one of the modems into a wireless router (so that I can plug it into a computer that does not have a wireless card).
Does anyone have step-by-step instructions? I am googling, but not finding much yet.
Without knowing the model or capabilities of your modems, the one that you want to connect to a computer will need to be setup in bridge mode. It will then need the creditials of the wireless network entered, creating the wireless bridge.
lots of results in google outlining all the different possibilities.