Problems external pinging second interface on two NIC two subnet Windows 7

Solution 1:

If the pings to NIC 2 are coming from a different subnet/network, such as 10.0.0.0/8, then your ping responses back will get sent out the default gateway, on NIC 1. This is because the ping response is targeting a 10.0.0.0/8 address, and traffic to such an address, by the routing table, will go out through NIC 1. The pinging computer doesn't recognize the IP on NIC 1 as the IP that it is pinging, so it drops the received ping response.

Unfortunately, I don't have a solution at this point, only an explanation.

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