# Loopback
auto lo
iface lo inet loopback

# Primary network interface
auto eth0
iface eth0 inet static
    address 10.1.1.100
    netmask 255.255.255.0
    network 10.1.1.0
    broadcast 10.1.1.255
    gateway 10.1.1.1
    dns-nameserver 8.8.8.8

$ connmanctl services
*AR Wired    ethernet_544a16cac68f_cable
$ connmanctl config ethernet_544a16cac68f_cable --ipv4 manual 10.1.1.100 255.255.255.0 10.1.1.1 --nameservers 8.8.8.8

# From host to gateway
$ ping 10.1.1.1
From 10.1.1.100 icmp_seq=1 Destination Host Unreachable

127.0.0.1 localhost
127.0.1.1 device

nameserver 127.0.0.1
nameserver ::1

$ route
Destination Gateway   Genmask          Flags Metric Ref Use Iface
default     10.2.1.6  0.0.0.0          UG    0      0   0   eth0
8.8.8.8     10.2.1.6  255.255.255.255  UGH   0      0   0   eth0
10.2.1.0    *         255.255.255.0    U     0      0   0   eth0
10.2.1.6    *         255.255.255.255  UH    0      0   0   eth0

$ arp -n
Address    HWtype    HWaddress    Flags    Mask    Iface
10.2.1.6             (incomplete)                  eth0

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

$ sysctl -p
$ cat /proc/sys/net/ipv6/conf/all/disable_ipv6
1