우분투 16.04 - 인터넷 접속 불가

root@ubuntu:/# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback


# Liveliness Interface
auto ens3
iface ens3 inet static
address 192.0.2.100/24

dns nameservers 8.8.8.8 192.0.2.1 1.1.1.1

Please check /etc/network/interfaces.d before changing this file
# as interfaces may have been defined in /etc/network/interfaces.d
# See LP: #1262951
source /etc/network/interfaces.d/*.cfg

root@ubuntu:/# cat /etc/network/interfaces.d/50-cloud-init.cfg

# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
auto lo
iface lo inet loopback

auto ens3
iface ens3 inet static
 address 192.0.2.100
 netmask 255.255.255.0
 network 192.0.2.0
 broadcast 192.0.2.255
 gateway 192.0.2.1
dns nameservers 8.8.8.8 192.0.2.1

Systemctl이 로드되고 상태가 활성 상태입니다!

root@ubuntu:~# systemctl status networking.service
● networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor prese
  Drop-In: /run/systemd/generator/networking.service.d
           └─50-insserv.conf-$network.conf
   Active: active (exited) since Fri 2020-04-03 09:24:56 UTC; 59s ago
     Docs: man:interfaces(5)
  Process: 1485 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=
  Process: 1479 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [
 Main PID: 1485 (code=exited, status=0/SUCCESS)

Apr 03 09:24:56 ubuntu systemd[1]: Starting Raise network interfaces...
Apr 03 09:24:56 ubuntu systemd[1]: Started Raise network interfaces.

인터넷에 접속할 수 없습니다.

root@ubuntu:/# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3022ms