One of my servers has two network cards, each on a different subnet. When a second server with a connection on just one of those subnets pings the first server, it receives a response. Why?

Updated -

A machine has two network interfaces in different subnets, for example:

Node1 has two interfaces like this:

eth0 : 192.168.0.201/255.255.255.0
eth1 : 10.66.0.101/255.255.255.0

And there is a Node2 with an interface like this:

eth0 : 192.168.0.202/255.255.255.0

The eth0 of both nodes are connected and the eth1 of Node1 has no ...

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