Question on backup network link

I created an internal network using Hyper-V on a 10.x.x. network. I want to cluster 2 of the servers, so I created an additional NIC on the 2 servers. I put the second NIC on the same subnet. I can ping Server 1 from Server 2, but can't ping Server 2 from Server 1.

I tried put the second NICs on a different subnet. 192.168.1.1 and 192.168.1.2. I got the same results. 

I know this is not a best practice, but can anyone shed some light on this?  BTW, The NICs are using the same internal network .

Any help appreciated.

scott 

Scott D Hastings, Sr.