Làm thế nào để hệ điều hành khách của VirtualBox có được địa chỉ IP động hợp lệ?

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Tôi đã cài đặt CentOS 7trong VirtualBox, và muốn vị khách CentOSsử dụng địa chỉ IP động. Các loại mạng là bridged.

Người dẫn chương trình OSlà Windows 7, và thông tin mạng là như thế này:

nhập mô tả hình ảnh ở đây

Tôi đã sửa đổi cấu hình card mạng của khách CentOS:
nhập mô tả hình ảnh ở đây

Sau khi thực hiện service network restartlệnh "" và sử dụng ip addrđể hiển thị IPđịa chỉ:
nhập mô tả hình ảnh ở đây

Mạng và dhcpnhật ký liên quan là như thế này: 

  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]: <info> NetworkManager (version 1.0.0-14.git20150121.b4ea599c.el7) is starting...
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> Read config: /etc/NetworkManager/NetworkManager.conf and conf.d: 10-ibft-plugin.conf
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> WEXT support is disabled
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> Acquired D-Bus service com.redhat.ifcfgrh1
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> 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]: <info> 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]: <info> 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]: <info> parsing /etc/sysconfig/network-scripts/ifcfg-lo ...
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> parsing /etc/sysconfig/network-scripts/ifcfg-enp0s3 ...
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> read connection 'enp0s3'
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> 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]: <info> WiFi enabled by radio killswitch; enabled by state file
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> WWAN enabled by radio killswitch; enabled by state file
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> WiMAX enabled by radio killswitch; enabled by state file
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> Networking is enabled by state file
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> (lo): link connected
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> (lo): carrier is ON
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> (lo): new Generic device (driver: 'unknown' ifindex: 1)
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> (lo): exported as /org/freedesktop/NetworkManager/Devices/0
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> (enp0s3): carrier is OFF
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> (enp0s3): new Ethernet device (driver: 'e1000' ifindex: 2)
  Jun 4 01:52:51 CentOS NetworkManager[689]: <info> (enp0s3): exported as /org/freedesktop/NetworkManager/Devices/1
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): preparing device
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): link connected
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): device state change: unavailable -> disconnected (reason 'carrier-changed') [20 30 40]
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> Auto-activating connection 'enp0s3'.
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): Activation: starting connection 'enp0s3'
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) scheduled...
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) started...
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): device state change: disconnected -> prepare (reason 'none') [30 40 0]
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> NetworkManager state is now CONNECTING
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) scheduled...
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) complete.
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) starting...
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): device state change: prepare -> config (reason 'none') [40 50 0]
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) successful.
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) complete.
  Jun 4 01:52:52 CentOS NetworkManager[689]: <info> 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]: <info> 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]: <info> 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]: <info> 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]: <info> (enp0s3): Activation: Stage 3 of 5 (IP Configure Start) scheduled.
  Jun 4 01:52:53 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 3 of 5 (IP Configure Start) started...
  Jun 4 01:52:53 CentOS NetworkManager[689]: <info> (enp0s3): device state change: config -> ip-config (reason 'none') [50 70 0]
  Jun 4 01:52:53 CentOS NetworkManager[689]: <info> Activation (enp0s3) Beginning DHCPv4 transaction (timeout in 45 seconds)
  Jun 4 01:52:53 CentOS NetworkManager[689]: <info> dhclient started with pid 1140
  Jun 4 01:52:53 CentOS NetworkManager[689]: <info> (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]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
  Jun 4 01:53:24 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv6 Configure Timeout) started...
  Jun 4 01:53:24 CentOS NetworkManager[689]: <info> (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]: <warn> (enp0s3): DHCPv4 request timed out.
  Jun 4 01:53:38 CentOS NetworkManager[689]: <info> (enp0s3): DHCPv4 state changed unknown -> timeout
  Jun 4 01:53:38 CentOS NetworkManager[689]: <info> (enp0s3): canceled DHCP transaction, DHCP client pid 1140
  Jun 4 01:53:38 CentOS NetworkManager[689]: <info> (enp0s3): DHCPv4 state changed timeout -> done
  Jun 4 01:53:38 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) scheduled...
  Jun 4 01:53:38 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) started...
  Jun 4 01:53:38 CentOS NetworkManager[689]: <info> (enp0s3): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
  Jun 4 01:53:38 CentOS NetworkManager[689]: <info> NetworkManager state is now DISCONNECTED
  Jun 4 01:53:38 CentOS NetworkManager[689]: <info> startup complete
  Jun 4 01:53:38 CentOS NetworkManager[689]: <warn> (enp0s3): Activation: failed for connection 'enp0s3'
  Jun 4 01:53:38 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) complete.
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): device state change: failed -> disconnected (reason 'none') [120 30 0]
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): deactivating device (reason 'none') [0]
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> Auto-activating connection 'enp0s3'.
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: starting connection 'enp0s3'
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) scheduled...
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) started...
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): device state change: disconnected -> prepare (reason 'none') [30 40 0]
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> NetworkManager state is now CONNECTING
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) scheduled...
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) complete.
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) starting...
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): device state change: prepare -> config (reason 'none') [40 50 0]
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) successful.
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) complete.
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 3 of 5 (IP Configure Start) scheduled.
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 3 of 5 (IP Configure Start) started...
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (enp0s3): device state change: config -> ip-config (reason 'none') [50 70 0]
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> Activation (enp0s3) Beginning DHCPv4 transaction (timeout in 45 seconds)
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> dhclient started with pid 2365
  Jun 4 01:53:39 CentOS NetworkManager[689]: <info> (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]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
  Jun 4 01:54:10 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv6 Configure Timeout) started...
  Jun 4 01:54:10 CentOS NetworkManager[689]: <info> (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]: <warn> (enp0s3): DHCPv4 request timed out.
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): DHCPv4 state changed unknown -> timeout
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): canceled DHCP transaction, DHCP client pid 2365
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): DHCPv4 state changed timeout -> done
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) scheduled...
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) started...
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> NetworkManager state is now DISCONNECTED
  Jun 4 01:54:23 CentOS NetworkManager[689]: <warn> (enp0s3): Activation: failed for connection 'enp0s3'
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) complete.
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): device state change: failed -> disconnected (reason 'none') [120 30 0]
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): deactivating device (reason 'none') [0]
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> Auto-activating connection 'enp0s3'.
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: starting connection 'enp0s3'
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) scheduled...
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) started...
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): device state change: disconnected -> prepare (reason 'none') [30 40 0]
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> NetworkManager state is now CONNECTING
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) scheduled...
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) complete.
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) starting...
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): device state change: prepare -> config (reason 'none') [40 50 0]
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) successful.
  Jun 4 01:54:23 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) complete.
  Jun 4 01:54:24 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 3 of 5 (IP Configure Start) scheduled.
  Jun 4 01:54:24 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 3 of 5 (IP Configure Start) started...
  Jun 4 01:54:24 CentOS NetworkManager[689]: <info> (enp0s3): device state change: config -> ip-config (reason 'none') [50 70 0]
  Jun 4 01:54:24 CentOS NetworkManager[689]: <info> Activation (enp0s3) Beginning DHCPv4 transaction (timeout in 45 seconds)
  Jun 4 01:54:24 CentOS NetworkManager[689]: <info> dhclient started with pid 2393
  Jun 4 01:54:24 CentOS NetworkManager[689]: <info> (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]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
  Jun 4 01:54:55 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv6 Configure Timeout) started...
  Jun 4 01:54:55 CentOS NetworkManager[689]: <info> (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]: <warn> (enp0s3): DHCPv4 request timed out.
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): DHCPv4 state changed unknown -> timeout
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): canceled DHCP transaction, DHCP client pid 2393
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): DHCPv4 state changed timeout -> done
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) scheduled...
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) started...
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> NetworkManager state is now DISCONNECTED
  Jun 4 01:55:08 CentOS NetworkManager[689]: <warn> (enp0s3): Activation: failed for connection 'enp0s3'
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) complete.
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): device state change: failed -> disconnected (reason 'none') [120 30 0]
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): deactivating device (reason 'none') [0]
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> Auto-activating connection 'enp0s3'.
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: starting connection 'enp0s3'
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) scheduled...
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) started...
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): device state change: disconnected -> prepare (reason 'none') [30 40 0]
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> NetworkManager state is now CONNECTING
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) scheduled...
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 1 of 5 (Device Prepare) complete.
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) starting...
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): device state change: prepare -> config (reason 'none') [40 50 0]
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) successful.
  Jun 4 01:55:08 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 2 of 5 (Device Configure) complete.
  Jun 4 01:55:09 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 3 of 5 (IP Configure Start) scheduled.
  Jun 4 01:55:09 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 3 of 5 (IP Configure Start) started...
  Jun 4 01:55:09 CentOS NetworkManager[689]: <info> (enp0s3): device state change: config -> ip-config (reason 'none') [50 70 0]
  Jun 4 01:55:09 CentOS NetworkManager[689]: <info> Activation (enp0s3) Beginning DHCPv4 transaction (timeout in 45 seconds)
  Jun 4 01:55:09 CentOS NetworkManager[689]: <info> dhclient started with pid 2421
  Jun 4 01:55:09 CentOS NetworkManager[689]: <info> (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]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
  Jun 4 01:55:39 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv6 Configure Timeout) started...
  Jun 4 01:55:39 CentOS NetworkManager[689]: <info> (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]: <warn> (enp0s3): DHCPv4 request timed out.
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> (enp0s3): DHCPv4 state changed unknown -> timeout
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> (enp0s3): canceled DHCP transaction, DHCP client pid 2421
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> (enp0s3): DHCPv4 state changed timeout -> done
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) scheduled...
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) started...
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> (enp0s3): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> NetworkManager state is now DISCONNECTED
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> Disabling autoconnect for connection 'enp0s3'.
  Jun 4 01:55:53 CentOS NetworkManager[689]: <warn> (enp0s3): Activation: failed for connection 'enp0s3'
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> (enp0s3): Activation: Stage 4 of 5 (IPv4 Configure Timeout) complete.
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> (enp0s3): device state change: failed -> disconnected (reason 'none') [120 30 0]
  Jun 4 01:55:53 CentOS NetworkManager[689]: <info> (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.

Thẻ mạng enp0s3vẫn không thể có được IPđịa chỉ hợp lệ . Bất cứ ai có thể đưa ra một số manh mối về vấn đề này?

windows-7  networking  virtualbox  centos  dhcp 
— Nan Xiao
nguồn
1
Thêm cổng và dns theo cách này không phù hợp với địa chỉ động, vì vậy tôi khuyên bạn nên xóa hai câu lệnh này. VirtualBox có một gui rõ ràng để thiết lập mạng Bridged, bạn đã làm theo chưa? Nếu vậy, có lẽ bạn có vấn đề đã thảo luận giải quyết ở đây: forum.virtualbox.org/viewtopic.php?f=6&t=37035
— MariusMatutiae
Điều gì xảy ra nếu bạn tự làm dhclient enp0s3?
— txtechhelp
@txtechhelp: Tôi đã thêm nhật ký về dhclient enp0s3. Hệ thống hoạt động tốt khi máy chủ sử dụng cáp ethernet, chỉ bị lỗi khi sử dụng mạng không dây.
— Nan Xiao
Có lẽ bạn đang ở một mạng khác thông qua Wifi? Nếu mạng được thiết lập qua cáp trước, thì wifi có thể bị lỗi.
— XUÂN
@SPRBRN: Không, chỉ cấu hình một card mạng WIFI cũng có vấn đề tương tự.
— Nan Xiao
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