$ sudo systemctl restart network
$ sudo systemctl status network.service
● network.service - LSB: Bring up/down networking
Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
Active: active (running) since Fri 2022-10-23 11:47:21 JST; 7s ago
Docs: man:systemd-sysv-generator(8)
Process: 1657 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=0/SUCCESS)
CGroup: /system.slice/network.service
└─1841 /sbin/dhclient -1 -q -lf /var/lib/dhclient/dhclient--eth0.l...
Oct 23 11:47:21 hostname network[1657]: RTNETLINK answers: File exists
Oct 23 11:47:21 hostname network[1657]: RTNETLINK answers: File exists
Oct 23 11:47:21 hostname network[1657]: RTNETLINK answers: File exists
Oct 23 11:47:21 hostname network[1657]: RTNETLINK answers: File exists
Oct 23 11:47:21 hostname network[1657]: RTNETLINK answers: File exists
Oct 23 11:47:21 hostname network[1657]: RTNETLINK answers: File exists
Oct 23 11:47:21 hostname network[1657]: RTNETLINK answers: File exists
Oct 23 11:47:21 hostname network[1657]: RTNETLINK answers: File exists
Oct 23 11:47:21 hostname network[1657]: RTNETLINK answers: File exists
Oct 23 11:47:21 hostname systemd[1]: Started LSB: Bring up/down netw....
Hint: Some lines were ellipsized, use -l to show in full.
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000
link/ether 0a:b8:0a:4e:d8:55 brd ff:ff:ff:ff:ff:ff
inet 172.32.16.100/21 brd 172.16.31.255 scope global dynamic eth0
valid_lft 3581sec preferred_lft 3581sec
inet6 fe80::8b8:aff:fe4e:d855/64 scope link
valid_lft forever preferred_lft forever