so since you started talking about network masks, you have to be more specific about the public network address range you’re using, how you’re PINGing the device (like what the PC’s network setup is), and how the network is routed. You don’t need to tell us the EXACT network addresses, but you need to make sure you tell us the “relative” network addresses for the default gateway, the test PC and the ChipworkX device. Even if you use 10.x.x.x which isn’t public, and just tell us your device’s details.
To me it sounds like your network routing isn’t working as you expect - a couple of causes are:
- The 255.0.0.0 subnet mask is not the correct subnet mask to use for the network the device is on. [ That is a single Class A address block that is not routed - that’s 16.5 million addresses in a switched network, is that really what you have?! ]
- You’re testing across a router/firewall that is blocking ICMP.
- The default gateway you have set on ChipX is not working as expected.
If you tell us how the netowkring bits are set up we can tell you how it should work and then where to look for issues. The fact that it does work when you have a different network setup on your internal network points to a small change on the network being all that’s needed but to get it right we need more info.