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Hi Yong,

Sorry it took me so long to fully investigate this. It turns out the answer is actually quite simple, it just took me a while to figure it out.

The reason you're seeing this behavior is that the namespace for the DHCP server only has a route to a local subnet, it does not have a "default route" to reach other subnets. Thus, you can ping it from an IP in the same subnet as the DHCP server, but not from any server in a different subnet.

Arguably this is the right thing, as their is no reason anyone outside of the local subnet needs to contact the DHCP server.