1) /etc/network/interfaces

Modify and insert bold method.

auto lo

iface lo inet loopback

iface eth0 inet static

address 10.10.86.10

netmask 255.255.255.0

gateway 10.10.86.254

allow-hotplug wlan0

iface wlan0 inet manual

    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

allow-hotplug wlan1

iface wlan1 inet manual

    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

2) /etc/dhcpcd.conf

Insert following this to last row.

interface eth0

static ip_address=10.10.86.10

static routers=10.10.86.254

static domain_name_servers=10.10.86.254 8.8.8.8