Are you trying to ping at the IP level, or the Ethernet level? Some devices (for various reasons) aren't going to respond to a ICMP ping.

Generally, the way the ping command works amongst other network tools, is simply by sending special packets known as Internet Control Message Protocol (ICMP) Echo Requests to a target device, and then ...

Troubleshoot your networking problems like a pro, never having to deal with "Connection refused." ...