I have two PC's, one running Archlinux connected via ethernet to the other Ubuntu 16.04 machine which is connected to a wireless access point.
I followed the steps to share an internet connection in this thread: Sharing Connection to other PCs (Via Wired Ethernet). From my Archlinux pc I am able to ping Ubuntu's ethernet interface as well as Ubuntu's wireless interface, however, I am unable to ping the wireless access point.
Do I need to configure a bridge between the two interfaces or is it possible the access point is refusing the private IP's i've assigned to my ethernet interfaces?