See the screenshots.
eth0 is the NIC which is connected to the switch (1GBit) with access to the internet (gateway and DNS is set).
eth1 is the connection between the server and the pc (10GBit - no internet access, no gateway and no DNS).
Both NICs have static IPs and eth1 has no DNS or gateway settings because its a peer-to-peer link between both computers.
Your setting is confusing... set "all" NICs on the server side to static and give them a proper IP.
Again: Every NIC needs his own seperated network - so you need 3 adresses in 3 different networks.
Example for IPs:
Network 1: Server 192.168.1.1 - PC1 192.168.1.2 (peer to peer link 1, NO inet access)
Network 2: Server 192.168.2.1 - PC2 192.168.2.2 (peer to peer link 2, NO inet access)
Network 3: Server 192.168.3.1 >> switch and the whole LAN with inet access (adress range 192.168.3.1 - 192.168.3.254)
Subnetmask: 255.255.255.0 (24)
https://en.wikipedia.org/wiki/IP_address