add a second fixed IP address:
go to /etc/network/interfaces.d/ and add a new file “eth0-secondIP” with this content:
auto eth0:1
allow-hotplug eth0:1
iface eth0:1 inet static
vlan-raw-device eth0
address 192.168.1.101
netmask 255.255.255.0
gateway 192.168.1.1
disable the wifi interface:
go to /boot and add this line to the config.txt file:
dtoverlay=disable-wifi