|If it were me, I'd buy the second cable. Label both ends of it (with an indelible marker maybe) so you can tell it apart from the other computer's cable and then plug it into the second computer and run it to the router. Then, when you want that computer plugged in, just unplug computer one at the router and plug 2 in. Reverse when you want 1 plugged in.|
Alternatively, spend the $20, get a small 4 or 5 port switch, plug it into the router and plug both computers 1 and 2 into the switch.
I'd go with the switch.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.