I have two servers running RHEL 7.2.  Each have 2 NICs.  One NIC talks to a switch, and other is a direct connection between the two servers.  One of the servers will be an NFS server, and the second will do NFS over the private shared network.  I have a physical connection between the two servers (active link lights), but no traffic.  Suggestions?SERVER 1Private network NIC:4: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000    link/ether ac:f1:df:74:06:f9 brd ff:ff:ff:ff:ff:ff    inet 10.0.0.10/24 brd 10.0.0.255 scope global enp5s0       valid_lft forever preferred_lft forever    inet6 fe80::aef1:dfff:fe74:6f9/64 scope link        valid_lft forever preferred_lft foreverSERVER 23: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000    link/ether ac:f1:df:74:05:fc brd ff:ff:ff:ff:ff:ff    inet 10.0.0.11/24 brd 10.0.0.255 scope global enp5s0       valid_lft forever preferred_lft forever    inet6 fe80::aef1:dfff:fe74:5fc/64 scope link        valid_lft forever preferred_lft foreverOn server 2....# ip routedefault via 192.168.1.1 dev enp3s0  proto static  metric 100 10.0.0.0/24 dev enp5s0  proto kernel  scope link  src 10.0.0.11  metric 100 192.168.1.0/24 dev enp3s0  proto kernel  scope link  src 192.168.1.125  metric 100 When I run tcpdump on both systems' enp5s0, and try to ssh from server 2 to server 1, I see the following on server 2's enp5s0, but nothing on server 1...07:17:45.936772 ARP, Request who-has 10.0.0.10 (Broadcast) tell h2.atgreen.org, length 28What could be the problem?
Why can't my servers talk to each other over direct ethernet connection?
linux;networking;rhel