Why Can’t The CentOS Get Dynamic IP Address In WIFI Environment?

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Hi CentOS users,

I have install CentOS 7 in VirtualBox, and want the guest CentOS using dynamic IP address (The network type is bridged). I find the guest CentOS can works OK when using ethernet cable, but can’t get IP
address via wireless network. I also posted this issue on stackoverflow (http://superuser.com/questions/922045/how-does-the-guest-os-of-virtualbox-get-a-valid-dynamic-ip-address).

(1) The “ip addr” command outputs:
1: lo: mtu 65536 qdisc noqueue state UNKNOWN
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: enp0s3: mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:bc:e1:67 brd ff:ff:ff:ff:ff:ff

(2) The content of ifcfg-enp0s3:
TYPE=”Ethernet”
BOOTPROTO=”dhcp”
DEFROUTE=”yes”
PEERDNS=”yes”
PEERROUTES=”yes”
IPV4_FAILURE_FATAL=”no”
IPV6INIT=”yes”
IPV6_AUTOCONF=”yes”
IPV6_DEFROUTE=”yes”
IPV6_PEERDNS=”yes”
IPV6_PEERROUTES=”yes”
IPV6_FAILURE_FATAL=”no”
NAME=”enp0s3″
UUID=”6d221230-f35b-44da-9536-a4e9acfa2bc2″
DEVICE=”enp0s3″
ONBOOT=”yes”

(3) The network related logs from /var/log/messages:

Jun 4 01:52:40 CentOS kernel: drop_monitor: Initializing network drop monitor service
Jun 4 01:52:40 CentOS kernel: e1000: Intel(R) PRO/1000 Network Driver – version 7.3.21-k8-NAPI
Jun 4 01:52:41 CentOS kernel: e1000 0000:00:03.0 eth0: Intel(R)
PRO/1000 Network Connection
Jun 4 01:52:41 CentOS systemd-udevd[234]: renamed network interface eth0 to enp0s3
Jun 4 01:52:47 CentOS systemd: Starting Import network configuration from initramfs…
Jun 4 01:52:47 CentOS systemd: Started Import network configuration from initramfs.
Jun 4 01:52:51 CentOS systemd: Starting Network Manager…
Jun 4 01:52:51 CentOS NetworkManager[689]: NetworkManager
(version 1.0.0-14.git20150121.b4ea599c.el7) is starting…
Jun 4 01:52:51 CentOS NetworkManager[689]: Read config:
/etc/NetworkManager/NetworkManager.conf and conf.d:
10-ibft-plugin.conf
Jun 4 01:52:51 CentOS NetworkManager[689]: WEXT support is disabled
Jun 4 01:52:51 CentOS NetworkManager[689]: Acquired D-Bus service com.redhat.ifcfgrh1
Jun 4 01:52:51 CentOS NetworkManager[689]: Loaded plugin ifcfg-rh: (c) 2007 – 2013 Red Hat, Inc. To report bugs please use the NetworkManager mailing list.
Jun 4 01:52:51 CentOS NetworkManager[689]: Loaded plugin iBFT: (c) 2014 Red Hat, Inc. To report bugs please use the NetworkManager mailing list.
Jun 4 01:52:51 CentOS NetworkManager[689]: Loaded plugin keyfile: (c) 2007 – 2013 Red Hat, Inc. To report bugs please use the NetworkManager mailing list.
Jun 4 01:52:51 CentOS NetworkManager[689]: parsing
/etc/sysconfig/network-scripts/ifcfg-lo …
Jun 4 01:52:51 CentOS NetworkManager[689]: parsing
/etc/sysconfig/network-scripts/ifcfg-enp0s3 …
Jun 4 01:52:51 CentOS NetworkManager[689]: read connection ‘enp0s3’
Jun 4 01:52:51 CentOS NetworkManager[689]: monitoring kernel firmware directory ‘/lib/firmware’.
Jun 4 01:52:51 CentOS systemd: Started Network Manager.
Jun 4 01:52:51 CentOS systemd: Starting LSB: Bring up/down networking…
Jun 4 01:52:51 CentOS NetworkManager[689]: WiFi enabled by radio killswitch; enabled by state file
Jun 4 01:52:51 CentOS NetworkManager[689]: WWAN enabled by radio killswitch; enabled by state file
Jun 4 01:52:51 CentOS NetworkManager[689]: WiMAX enabled by radio killswitch; enabled by state file
Jun 4 01:52:51 CentOS NetworkManager[689]: Networking is enabled by state file
Jun 4 01:52:51 CentOS NetworkManager[689]: (lo): link connected
Jun 4 01:52:51 CentOS NetworkManager[689]: (lo): carrier is ON
Jun 4 01:52:51 CentOS NetworkManager[689]: (lo): new Generic device (driver: ‘unknown’ ifindex: 1)
Jun 4 01:52:51 CentOS NetworkManager[689]: (lo): exported as
/org/freedesktop/NetworkManager/Devices/0
Jun 4 01:52:51 CentOS NetworkManager[689]: (enp0s3): carrier is OFF
Jun 4 01:52:51 CentOS NetworkManager[689]: (enp0s3): new Ethernet device (driver: ‘e1000’ ifindex: 2)
Jun 4 01:52:51 CentOS NetworkManager[689]: (enp0s3): exported as /org/freedesktop/NetworkManager/Devices/1
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3): device state change: unmanaged -> unavailable (reason ‘managed’) [10 20 2]
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3): preparing device
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3): link connected
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3): device state change: unavailable -> disconnected (reason ‘carrier-changed’)
[20 30 40]
Jun 4 01:52:52 CentOS NetworkManager[689]: Auto-activating connection ‘enp0s3’.
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3):
Activation: starting connection ‘enp0s3’
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) scheduled…
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) started…
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3): device state change: disconnected -> prepare (reason ‘none’) [30 40 0]
Jun 4 01:52:52 CentOS NetworkManager[689]: NetworkManager state is now CONNECTING
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) scheduled…
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) complete.
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) starting…
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3): device state change: prepare -> config (reason ‘none’) [40 50 0]
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) successful.
Jun 4 01:52:52 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) complete.
Jun 4 01:52:52 CentOS NetworkManager[689]: parsing
/etc/sysconfig/network-scripts/ifcfg-lo …
Jun 4 01:52:52 CentOS network: Bringing up loopback interface: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’
Jun 4 01:52:52 CentOS NetworkManager[689]: parsing
/etc/sysconfig/network-scripts/ifcfg-lo …
Jun 4 01:52:52 CentOS network: Could not load file
‘/etc/sysconfig/network-scripts/ifcfg-lo’
Jun 4 01:52:52 CentOS NetworkManager[689]: parsing
/etc/sysconfig/network-scripts/ifcfg-lo …
Jun 4 01:52:52 CentOS network: Could not load file
‘/etc/sysconfig/network-scripts/ifcfg-lo’
Jun 4 01:52:53 CentOS NetworkManager[689]: parsing
/etc/sysconfig/network-scripts/ifcfg-lo …
Jun 4 01:52:53 CentOS network: Could not load file
‘/etc/sysconfig/network-scripts/ifcfg-lo’
Jun 4 01:52:53 CentOS network: [ OK ]
Jun 4 01:52:53 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) scheduled.
Jun 4 01:52:53 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) started…
Jun 4 01:52:53 CentOS NetworkManager[689]: (enp0s3): device state change: config -> ip-config (reason ‘none’) [50 70 0]
Jun 4 01:52:53 CentOS NetworkManager[689]: Activation
(enp0s3) Beginning DHCPv4 transaction (timeout in 45 seconds)
Jun 4 01:52:53 CentOS NetworkManager[689]: dhclient started with pid 1140
Jun 4 01:52:53 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) complete.
Jun 4 01:52:53 CentOS network: Bringing up interface enp0s3: [ OK ]
Jun 4 01:52:53 CentOS systemd: Started LSB: Bring up/down networking.
Jun 4 01:52:53 CentOS systemd: Starting Network.
Jun 4 01:52:53 CentOS systemd: Reached target Network.
Jun 4 01:52:53 CentOS dhclient[1140]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0x623c8c73)
Jun 4 01:52:59 CentOS dhclient[1140]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0x623c8c73)
Jun 4 01:53:06 CentOS dhclient[1140]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 7 (xid=0x28b9690d)
Jun 4 01:53:13 CentOS dhclient[1140]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 17 (xid=0x28b9690d)
Jun 4 01:53:24 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) scheduled…
Jun 4 01:53:24 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) started…
Jun 4 01:53:24 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) complete.
Jun 4 01:53:30 CentOS dhclient[1140]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 14 (xid=0x28b9690d)
Jun 4 01:53:38 CentOS NetworkManager[689]: (enp0s3): DHCPv4
request timed out.
Jun 4 01:53:38 CentOS NetworkManager[689]: (enp0s3): DHCPv4
state changed unknown -> timeout
Jun 4 01:53:38 CentOS NetworkManager[689]: (enp0s3): canceled DHCP transaction, DHCP client pid 1140
Jun 4 01:53:38 CentOS NetworkManager[689]: (enp0s3): DHCPv4
state changed timeout -> done
Jun 4 01:53:38 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) scheduled…
Jun 4 01:53:38 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) started…
Jun 4 01:53:38 CentOS NetworkManager[689]: (enp0s3): device state change: ip-config -> failed (reason ‘ip-config-unavailable’) [70
120 5]
Jun 4 01:53:38 CentOS NetworkManager[689]: NetworkManager state is now DISCONNECTED
Jun 4 01:53:38 CentOS NetworkManager[689]: startup complete
Jun 4 01:53:38 CentOS NetworkManager[689]: (enp0s3):
Activation: failed for connection ‘enp0s3’
Jun 4 01:53:38 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) complete.
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3): device state change: failed -> disconnected (reason ‘none’) [120 30 0]
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
deactivating device (reason ‘none’) [0]
Jun 4 01:53:39 CentOS NetworkManager[689]: Auto-activating connection ‘enp0s3’.
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: starting connection ‘enp0s3’
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) scheduled…
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) started…
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3): device state change: disconnected -> prepare (reason ‘none’) [30 40 0]
Jun 4 01:53:39 CentOS NetworkManager[689]: NetworkManager state is now CONNECTING
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) scheduled…
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) complete.
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) starting…
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3): device state change: prepare -> config (reason ‘none’) [40 50 0]
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) successful.
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) complete.
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) scheduled.
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) started…
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3): device state change: config -> ip-config (reason ‘none’) [50 70 0]
Jun 4 01:53:39 CentOS NetworkManager[689]: Activation
(enp0s3) Beginning DHCPv4 transaction (timeout in 45 seconds)
Jun 4 01:53:39 CentOS NetworkManager[689]: dhclient started with pid 2365
Jun 4 01:53:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) complete.
Jun 4 01:53:39 CentOS dhclient[2365]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0x224ada0f)
Jun 4 01:53:42 CentOS dhclient[2365]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0x224ada0f)
Jun 4 01:53:46 CentOS dhclient[2365]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0x224ada0f)
Jun 4 01:53:54 CentOS dhclient[2365]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 7 (xid=0x1de75b49)
Jun 4 01:54:01 CentOS dhclient[2365]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 11 (xid=0x1de75b49)
Jun 4 01:54:10 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) scheduled…
Jun 4 01:54:10 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) started…
Jun 4 01:54:10 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) complete.
Jun 4 01:54:12 CentOS dhclient[2365]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 21 (xid=0x1de75b49)
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3): DHCPv4
request timed out.
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3): DHCPv4
state changed unknown -> timeout
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3): canceled DHCP transaction, DHCP client pid 2365
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3): DHCPv4
state changed timeout -> done
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) scheduled…
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) started…
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3): device state change: ip-config -> failed (reason ‘ip-config-unavailable’) [70
120 5]
Jun 4 01:54:23 CentOS NetworkManager[689]: NetworkManager state is now DISCONNECTED
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: failed for connection ‘enp0s3’
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) complete.
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3): device state change: failed -> disconnected (reason ‘none’) [120 30 0]
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
deactivating device (reason ‘none’) [0]
Jun 4 01:54:23 CentOS NetworkManager[689]: Auto-activating connection ‘enp0s3’.
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: starting connection ‘enp0s3’
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) scheduled…
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) started…
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3): device state change: disconnected -> prepare (reason ‘none’) [30 40 0]
Jun 4 01:54:23 CentOS NetworkManager[689]: NetworkManager state is now CONNECTING
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) scheduled…
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) complete.
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) starting…
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3): device state change: prepare -> config (reason ‘none’) [40 50 0]
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) successful.
Jun 4 01:54:23 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) complete.
Jun 4 01:54:24 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) scheduled.
Jun 4 01:54:24 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) started…
Jun 4 01:54:24 CentOS NetworkManager[689]: (enp0s3): device state change: config -> ip-config (reason ‘none’) [50 70 0]
Jun 4 01:54:24 CentOS NetworkManager[689]: Activation
(enp0s3) Beginning DHCPv4 transaction (timeout in 45 seconds)
Jun 4 01:54:24 CentOS NetworkManager[689]: dhclient started with pid 2393
Jun 4 01:54:24 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) complete.
Jun 4 01:54:24 CentOS dhclient[2393]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0x77843ed1)
Jun 4 01:54:29 CentOS dhclient[2393]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0x77843ed1)
Jun 4 01:54:41 CentOS dhclient[2393]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 4 (xid=0xe3a3af6)
Jun 4 01:54:45 CentOS dhclient[2393]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 5 (xid=0xe3a3af6)
Jun 4 01:54:50 CentOS dhclient[2393]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 12 (xid=0xe3a3af6)
Jun 4 01:54:55 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) scheduled…
Jun 4 01:54:55 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) started…
Jun 4 01:54:55 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) complete.
Jun 4 01:55:02 CentOS dhclient[2393]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 14 (xid=0xe3a3af6)
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3): DHCPv4
request timed out.
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3): DHCPv4
state changed unknown -> timeout
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3): canceled DHCP transaction, DHCP client pid 2393
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3): DHCPv4
state changed timeout -> done
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) scheduled…
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) started…
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3): device state change: ip-config -> failed (reason ‘ip-config-unavailable’) [70
120 5]
Jun 4 01:55:08 CentOS NetworkManager[689]: NetworkManager state is now DISCONNECTED
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: failed for connection ‘enp0s3’
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) complete.
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3): device state change: failed -> disconnected (reason ‘none’) [120 30 0]
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
deactivating device (reason ‘none’) [0]
Jun 4 01:55:08 CentOS NetworkManager[689]: Auto-activating connection ‘enp0s3’.
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: starting connection ‘enp0s3’
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) scheduled…
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) started…
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3): device state change: disconnected -> prepare (reason ‘none’) [30 40 0]
Jun 4 01:55:08 CentOS NetworkManager[689]: NetworkManager state is now CONNECTING
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) scheduled…
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 1 of 5 (Device Prepare) complete.
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) starting…
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3): device state change: prepare -> config (reason ‘none’) [40 50 0]
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) successful.
Jun 4 01:55:08 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 2 of 5 (Device Configure) complete.
Jun 4 01:55:09 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) scheduled.
Jun 4 01:55:09 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) started…
Jun 4 01:55:09 CentOS NetworkManager[689]: (enp0s3): device state change: config -> ip-config (reason ‘none’) [50 70 0]
Jun 4 01:55:09 CentOS NetworkManager[689]: Activation
(enp0s3) Beginning DHCPv4 transaction (timeout in 45 seconds)
Jun 4 01:55:09 CentOS NetworkManager[689]: dhclient started with pid 2421
Jun 4 01:55:09 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 3 of 5 (IP Configure Start) complete.
Jun 4 01:55:09 CentOS dhclient[2421]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0xc0de211)
Jun 4 01:55:12 CentOS dhclient[2421]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0xc0de211)
Jun 4 01:55:16 CentOS dhclient[2421]: DHCPREQUEST on enp0s3 to
255.255.255.255 port 67 (xid=0xc0de211)
Jun 4 01:55:27 CentOS dhclient[2421]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 4 (xid=0x281d5ba3)
Jun 4 01:55:31 CentOS dhclient[2421]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 10 (xid=0x281d5ba3)
Jun 4 01:55:34 CentOS dhclient[2425]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 4 (xid=0x3e3fe85b)
Jun 4 01:55:38 CentOS dhclient[2425]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 5 (xid=0x3e3fe85b)
Jun 4 01:55:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) scheduled…
Jun 4 01:55:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) started…
Jun 4 01:55:39 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv6 Configure Timeout) complete.
Jun 4 01:55:41 CentOS dhclient[2421]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 7 (xid=0x281d5ba3)
Jun 4 01:55:43 CentOS dhclient[2425]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 12 (xid=0x3e3fe85b)
Jun 4 01:55:48 CentOS dhclient[2421]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 11 (xid=0x281d5ba3)
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3): DHCPv4
request timed out.
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3): DHCPv4
state changed unknown -> timeout
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3): canceled DHCP transaction, DHCP client pid 2421
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3): DHCPv4
state changed timeout -> done
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) scheduled…
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) started…
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3): device state change: ip-config -> failed (reason ‘ip-config-unavailable’) [70
120 5]
Jun 4 01:55:53 CentOS NetworkManager[689]: NetworkManager state is now DISCONNECTED
Jun 4 01:55:53 CentOS NetworkManager[689]: Disabling autoconnect for connection ‘enp0s3’.
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3):
Activation: failed for connection ‘enp0s3’
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3):
Activation: Stage 4 of 5 (IPv4 Configure Timeout) complete.
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3): device state change: failed -> disconnected (reason ‘none’) [120 30 0]
Jun 4 01:55:53 CentOS NetworkManager[689]: (enp0s3):
deactivating device (reason ‘none’) [0]
Jun 4 01:55:55 CentOS dhclient[2425]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 11 (xid=0x3e3fe85b)
Jun 4 01:56:06 CentOS dhclient[2425]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 17 (xid=0x3e3fe85b)
Jun 4 01:56:23 CentOS dhclient[2425]: DHCPDISCOVER on enp0s3 to
255.255.255.255 port 67 interval 12 (xid=0x3e3fe85b)
Jun 4 01:56:35 CentOS dhclient[2425]: No DHCPOFFERS received.
Jun 4 01:56:35 CentOS dhclient[2425]: No working leases in persistent database – sleeping.

Could anyone give some comments? Thanks very much!
Best Regards Nan Xiao

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