# Setting Up Networking for Multiple NICs If your machine contains multiple NICs, it is recommend that you create a `.network` configuration file for each network interface. The following scenario demonstrates how to set one wired network interface to use a static IP address and another wired network interface to use a dynamic IP address obtained through DHCP. **Note**: The following configurations are examples and you must change the IP addresses and other information to match your network and requirements. First, create the `.network` file for the static Ethernet connection in `/etc/systemd/network`. A best practice is to match the exact name of the network interface, which is `eth0` in this example. This example file also includes a DNS server for the static IP address. As a result, the configuration sets the UseDNS key to false in the DHCP column so that Photon OS ignores the DHCP server for DNS for this interface. cat > /etc/systemd/network/10-eth0-static-en.network << "EOF" [Match] Name=eth0 [Network] Address=10.137.20.11/19 Gateway=10.137.23.253 DNS=10.132.71.1 [DHCP] UseDNS=false EOF Second, create the `.network` file for the second network interface, which is `eth1` in this example. This configuration file sets the eth1 interface to an IP address from DHCP and sets DHCP as the source for DNS lookups. Setting the DHCP key to `yes` acquires an IP address for IPv4 and IPv6. To acquire an IP address for IPv4 only, set the DHCP key to `ipv4`. cat > /etc/systemd/network/50-eth1-dhcp-en.network << "EOF" [Match] Name=eth1 [Network] DHCP=yes [DHCP] UseDNS=true EOF