はじめに

network.serviceのエラーに関して、色々いじった結果解決できたので備忘録として。
ちなみに内容は全くわかってないため、保証はできません。

エラー文

$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Clearing any previously set forwarded ports...
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
  default: Adapter 1: nat
  default: Adapter 2: hostonly
==> default: You are trying to forward to privileged ports (ports <= 1024). Most
==> default: operating systems restrict this to only privileged process (typically
==> default: processes running as an administrative user). This is a warning in case
==> default: the port forwarding doesn't work. If any problems occur, please try a
==> default: port higher than 1024.
==> default: Forwarding ports...
  default: 80 (guest) => 3000 (host) (adapter 1)
  default: 443 (guest) => 443 (host) (adapter 1)
  default: 22 (guest) => 2222 (host) (adapter 1)
==> default: Running 'pre-boot' VM customizations...
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
  default: SSH address: 127.0.0.1:2222
  default: SSH username: vagrant
  default: SSH auth method: private key
  default: Warning: Remote connection disconnect. Retrying...
  default: Warning: Connection reset. Retrying...
  default: Warning: Remote connection disconnect. Retrying...
  default: Warning: Connection reset. Retrying...
  default: Warning: Remote connection disconnect. Retrying...
  default: Warning: Connection reset. Retrying...
  default: Warning: Remote connection disconnect. Retrying...
  default: Warning: Connection reset. Retrying...
  default: Warning: Remote connection disconnect. Retrying...
  default: Warning: Connection reset. Retrying...
  default: Warning: Remote connection disconnect. Retrying...
==> default: Machine booted and ready!
[default] GuestAdditions 5.1.18 running --- OK.
==> default: Checking for guest additions in VM...
==> default: Configuring and enabling network interfaces...
The following SSH command responded with a non-zero exit status.
Vagrant assumes that this means the command failed!

# Down the interface before munging the config file. This might
# fail if the interface is not actually set up yet so ignore
# errors.
/sbin/ifdown 'enp0s8'
# Move new config into place
mv -f '/tmp/vagrant-network-entry-enp0s8-1494406484-0' '/etc/sysconfig/network-scripts/ifcfg-enp0s8'
# attempt to force network manager to reload configurations
nmcli c reload || true

# Restart network
service network restart

Stdout from the command:

Restarting network (via systemctl): [FAILED]

Stderr from the command:

Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.

解決方法

vagrantへssh接続し、/etc/sysconfig/network-scripts/ifcfg-enp0s9のファイルを削除（移動の方がいいかもしれません）する。

$ vagrant ssh
[vagrant@localhost ~]$ sudo rm -rf /etc/sysconfig/network-scripts/ifcfg-enp0s9
[vagrant@localhost ~]$ sudo systemctl start network.service

移動の場合は以下のコマンドかな？

[vagrant@localhost ~]$ sudo mv /etc/sysconfig/network-scripts/ifcfg-enp0s9 ~/ifcfg-enp0s9
[vagrant@localhost ~]$ sudo systemctl start network.service

最後に

責任は持てませんが、誰かのお役に立てることを祈っております。

なお、下記のwarningに関しては解決しておりません（笑）

  default: Warning: Remote connection disconnect. Retrying...
  default: Warning: Connection reset. Retrying...

また、訂正すると思います。