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sysmicuser 06-24-2016 09:16 PM
Issue with network on centos 7
 
Hello,

I just installed CentOS 7 (Server with GUI) and guess what I could install Virtual Box Guest additions without installing any extra package/software which is great news !
Now bad news or not so great news.

My Host OS is Windows 10, Virtual Box is the virtualization software. CentOS7-1 is the name of Virtual machine I have created and agent1 is its hostname.

The issue is ,I am unable to connect to outside world, When I on CentOS7 VM I get error message like Connection Failed something on these lines.
Here is the output from /var/log/messages i.e from server itself.

Code:
[root@agent1 ~]# cat /var/log/messages |grep -i network
Jun 24 00:49:42 agent1 kernel: drop_monitor: Initializing network drop monitor service
Jun 24 00:49:42 agent1 kernel: e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
Jun 24 00:49:43 agent1 kernel: e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection
Jun 24 00:50:13 agent1 systemd: Starting Import network configuration from initramfs...
Jun 24 00:50:13 agent1 systemd: Started Import network configuration from initramfs.
Jun 24 00:50:18 agent1 avahi-daemon[656]: Network interface enumeration completed.
Jun 24 00:50:30 agent1 systemd: Starting Network Manager...
Jun 24 00:50:31 agent1 NetworkManager[802]: <info>  NetworkManager (version 1.0.6-27.el7) is starting...
Jun 24 00:50:31 agent1 NetworkManager[802]: <info>  Read config: /etc/NetworkManager/NetworkManager.conf and conf.d: 10-ibft-plugin.conf
Jun 24 00:50:31 agent1 systemd: Started Network Manager.
Jun 24 00:50:31 agent1 systemd: Starting Network Manager Wait Online...
Jun 24 00:50:31 agent1 NetworkManager[802]: <info>  VPN: loaded org.freedesktop.NetworkManager.libreswan
Jun 24 00:50:31 agent1 NetworkManager[802]: <info>  Loaded settings plugin ifcfg-rh: (c) 2007 - 2015 Red Hat, Inc.  To report bugs please use the NetworkManager mailing list. (/usr/lib64/NetworkManager/libnm-settings-plugin-ifcfg-rh.so)
Jun 24 00:50:31 agent1 NetworkManager[802]: <info>  Loaded settings plugin iBFT: (c) 2014 Red Hat, Inc.  To report bugs please use the NetworkManager mailing list. (/usr/lib64NetworkManager/libnm-settings-plugin-ibft.so)
Jun 24 00:50:31 agent1 NetworkManager[802]: <info>  Loaded settings plugin keyfile: (c) 2007 - 2015 Red Hat, Inc.  To report bugs please use the NetworkManager mailing list.
Jun 24 00:50:31 agent1 NetworkManager[802]: <info>  ifcfg-rh: new connection /etc/sysconfig/network-scripts/ifcfg-enp0s3 (9b49c161-f7b4-418d-ae5f-a4fae294d302,"enp0s3")
Jun 24 00:50:32 agent1 NetworkManager[802]: <info>  monitoring kernel firmware directory '/lib/firmware'.
Jun 24 00:50:32 agent1 NetworkManager[802]: <info>  (enp0s3): new Ethernet device (carrier: OFF, driver: 'e1000', ifindex: 2)
Jun 24 00:50:32 agent1 NetworkManager[802]: <info>  (enp0s3): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Jun 24 00:50:32 agent1 NetworkManager[802]: <info>  (enp0s3): link connected
Jun 24 00:50:32 agent1 NetworkManager[802]: <info>  (lo): link connected
Jun 24 00:50:32 agent1 NetworkManager[802]: <info>  (lo): new Generic device (carrier: ON, driver: 'unknown', ifindex: 1)
Jun 24 00:50:32 agent1 NetworkManager[802]: <info>  (enp0s3): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
Jun 24 00:50:32 agent1 NetworkManager[802]: <info>  wpa_supplicant running
Jun 24 00:50:37 agent1 NetworkManager[802]: <info>  startup complete
Jun 24 00:50:38 agent1 systemd: Started Network Manager Wait Online.
Jun 24 00:50:38 agent1 systemd: Starting LSB: Bring up/down networking...
Jun 24 00:50:38 agent1 network: Bringing up loopback interface:  Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jun 24 00:50:38 agent1 network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jun 24 00:50:38 agent1 network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jun 24 00:50:38 agent1 network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jun 24 00:50:38 agent1 network: [  OK  ]
Jun 24 00:50:38 agent1 systemd: Started LSB: Bring up/down networking.
Jun 24 00:50:38 agent1 systemd: Reached target Network.
Jun 24 00:50:38 agent1 systemd: Starting Network.
Jun 24 00:50:38 agent1 systemd: Reached target Network is Online.
Jun 24 00:50:38 agent1 systemd: Starting Network is Online.
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): new Bridge device (carrier: OFF, driver: 'bridge', ifindex: 3)
Jun 24 00:50:45 agent1 NetworkManager[802]: <warn>  (virbr0-nic): failed to find device 4 'virbr0-nic' with udev
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): link connected
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): new Ethernet device (carrier: ON, driver: 'tun', ifindex: 4)
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): bridge port virbr0-nic was attached
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): enslaved to virbr0
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  ifcfg-rh: add connection in-memory (bb6b0a9f-fdeb-4e97-9db8-61cc0e77a2fd,"Wired connection 1")
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): created default wired connection 'Wired connection 1'
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  Auto-activating connection 'Wired connection 1'.
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): Activation: starting connection 'Wired connection 1' (bb6b0a9f-fdeb-4e97-9db8-61cc0e77a2fd)
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  NetworkManager state is now CONNECTING
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): device state change: prepare -> config (reason 'none') [40 50 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): device state change: config -> ip-config (reason 'none') [50 70 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  Activation (virbr0-nic) Beginning DHCPv4 transaction (timeout in 45 seconds)
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  dhclient started with pid 3807
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): device state change: unmanaged -> unavailable (reason 'connection-assumed') [10 20 41]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  ifcfg-rh: add connection in-memory (3616b8dd-bbdc-47ca-b184-164dc4c05754,"virbr0")
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): device state change: unavailable -> disconnected (reason 'connection-assumed') [20 30 41]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): Activation: starting connection 'virbr0' (3616b8dd-bbdc-47ca-b184-164dc4c05754)
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): device state change: prepare -> config (reason 'none') [40 50 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): device state change: config -> ip-config (reason 'none') [50 70 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): device state change: secondaries -> activated (reason 'none') [90 100 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  NetworkManager state is now CONNECTED_LOCAL
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0-nic): Activation: successful, device activated.
Jun 24 00:50:45 agent1 systemd: Starting Network Manager Script Dispatcher Service...
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): device state change: ip-config -> ip-check (reason 'none') [70 80 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): device state change: ip-check -> secondaries (reason 'none') [80 90 0]
Jun 24 00:50:45 agent1 NetworkManager[802]: <info>  (virbr0): device state change: secondaries -> activated (reason 'none') [90 100 0]
Jun 24 00:50:45 agent1 dhclient[3807]: receive_packet failed on virbr0-nic: Network is down
Jun 24 00:50:45 agent1 systemd: Started Network Manager Script Dispatcher Service.
Jun 24 00:50:46 agent1 NetworkManager[802]: <info>  (virbr0): Activation: successful, device activated.
Jun 24 00:50:46 agent1 NetworkManager[802]: <info>  (virbr0-nic): link disconnected (deferring action for 4 seconds)
Jun 24 00:50:49 agent1 dracut: *** Including module: network ***
Jun 24 00:50:49 agent1 NetworkManager[802]: <info>  (virbr0-nic): link disconnected (calling deferred action)
Jun 24 00:50:50 agent1 dhclient[3807]: send_packet: Network is down
Jun 24 00:51:04 agent1 dhclient[3807]: send_packet: Network is down
Jun 24 00:51:21 agent1 dhclient[3807]: send_packet: Network is down
Jun 24 00:51:30 agent1 NetworkManager[802]: <warn>  (virbr0-nic): DHCPv4 request timed out.
Jun 24 00:51:30 agent1 NetworkManager[802]: <info>  (virbr0-nic): DHCPv4 state changed unknown -> timeout
Jun 24 00:51:31 agent1 NetworkManager[802]: <info>  (virbr0-nic): canceled DHCP transaction, DHCP client pid 3807
Jun 24 00:51:31 agent1 NetworkManager[802]: <info>  (virbr0-nic): DHCPv4 state changed timeout -> done
Jun 24 00:51:31 agent1 NetworkManager[802]: <info>  (virbr0-nic): device state change: activated -> failed (reason 'ip-config-unavailable') [100 120 5]
Jun 24 00:51:31 agent1 NetworkManager[802]: <info>  (virbr0): detached bridge port virbr0-nic
Jun 24 00:51:31 agent1 NetworkManager[802]: <info>  (virbr0-nic): released from master virbr0
Jun 24 00:51:31 agent1 NetworkManager[802]: <warn>  (virbr0-nic): Activation: failed for connection 'Wired connection 1'
Jun 24 00:51:31 agent1 NetworkManager[802]: <info>  (virbr0-nic): device state change: failed -> disconnected (reason 'none') [120 30 0]
Jun 24 00:51:31 agent1 systemd: Starting Network Manager Script Dispatcher Service...
Jun 24 00:51:31 agent1 systemd: Started Network Manager Script Dispatcher Service.
Jun 24 00:55:20 agent1 NetworkManager[802]: <info>  (enp0s3): link disconnected
Jun 24 00:55:20 agent1 NetworkManager[802]: <info>  (enp0s3): device state change: disconnected -> unavailable (reason 'carrier-changed') [30 20 40]
Jun 24 00:55:25 agent1 NetworkManager[802]: <info>  (enp0s3): link connected
Jun 24 00:55:25 agent1 NetworkManager[802]: <info>  (enp0s3): device state change: unavailable -> disconnected (reason 'carrier-changed') [20 30 40]
Jun 24 03:30:21 agent1 NetworkManager[802]: <info>  (enp0s3): link disconnected
Jun 24 03:30:21 agent1 NetworkManager[802]: <info>  (enp0s3): device state change: disconnected -> unavailable (reason 'carrier-changed') [30 20 40]
Jun 24 03:30:27 agent1 NetworkManager[802]: <info>  (enp0s3): link connected
Jun 24 03:30:27 agent1 NetworkManager[802]: <info>  (enp0s3): device state change: unavailable -> disconnected (reason 'carrier-changed') [20 30 40]
Jun 24 04:20:01 agent1 NetworkManager[802]: <warn>  error requesting auth for org.freedesktop.NetworkManager.settings.modify.hostname: (0) Authorization check failed: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
Jun 24 04:20:01 agent1 NetworkManager[802]: <warn>  error requesting auth for org.freedesktop.NetworkManager.settings.modify.own: (0) Authorization check failed: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
Jun 24 04:20:01 agent1 NetworkManager[802]: <warn>  error requesting auth for org.freedesktop.NetworkManager.settings.modify.system: (0) Authorization check failed: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
Jun 24 04:20:01 agent1 NetworkManager[802]: <warn>  error requesting auth for org.freedesktop.NetworkManager.wifi.share.open: (0) Authorization check failed: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
Jun 24 04:20:01 agent1 NetworkManager[802]: <warn>  error requesting auth for org.freedesktop.NetworkManager.wifi.share.protected: (0) Authorization check failed: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
Jun 24 04:20:01 agent1 NetworkManager[802]: <warn>  error requesting auth for org.freedesktop.NetworkManager.network-control: (0) Authorization check failed: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
Jun 24 05:46:58 agent1 dracut: *** Including module: network ***
Jun 24 05:47:21 agent1 NetworkManager[802]: <info>  (enp0s3): link disconnected
Jun 24 05:47:21 agent1 NetworkManager[802]: <info>  (enp0s3): device state change: disconnected -> unavailable (reason 'carrier-changed') [30 20 40]
Jun 24 05:47:27 agent1 NetworkManager[802]: <info>  (enp0s3): link connected
Jun 24 05:47:27 agent1 NetworkManager[802]: <info>  (enp0s3): device state change: unavailable -> disconnected (reason 'carrier-changed') [20 30 40]
Jun 24 23:49:39 agent1 systemd: Stopped target Network is Online.
Jun 24 23:49:39 agent1 systemd: Stopping Network is Online.
Jun 24 23:54:44 agent1 kernel: e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
Jun 24 23:54:45 agent1 kernel: e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection
Jun 24 23:55:00 agent1 systemd: Starting Import network configuration from initramfs...
Jun 24 23:55:01 agent1 systemd: Started Import network configuration from initramfs.
Jun 24 23:55:07 agent1 avahi-daemon[671]: Network interface enumeration completed.
Jun 24 23:55:17 agent1 systemd: Starting Network Manager...
Jun 24 23:55:18 agent1 NetworkManager[849]: <info>  NetworkManager (version 1.0.6-27.el7) is starting...
Jun 24 23:55:18 agent1 NetworkManager[849]: <info>  Read config: /etc/NetworkManager/NetworkManager.conf and conf.d: 10-ibft-plugin.conf
Jun 24 23:55:18 agent1 systemd: Started Network Manager.
Jun 24 23:55:18 agent1 systemd: Starting Network Manager Wait Online...
Jun 24 23:55:18 agent1 NetworkManager[849]: <info>  VPN: loaded org.freedesktop.NetworkManager.libreswan
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded settings plugin ifcfg-rh: (c) 2007 - 2015 Red Hat, Inc.  To report bugs please use the NetworkManager mailing list. (/usr/lib64/NetworkManager/libnm-settings-plugin-ifcfg-rh.so)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded settings plugin iBFT: (c) 2014 Red Hat, Inc.  To report bugs please use the NetworkManager mailing list. (/usr/lib64NetworkManager/libnm-settings-plugin-ibft.so)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded settings plugin keyfile: (c) 2007 - 2015 Red Hat, Inc.  To report bugs please use the NetworkManager mailing list.
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  ifcfg-rh: new connection /etc/sysconfig/network-scripts/ifcfg-enp0s3 (9b49c161-f7b4-418d-ae5f-a4fae294d302,"enp0s3")
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  monitoring kernel firmware directory '/lib/firmware'.
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMVxlanFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMVlanFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMVethFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMTunFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMMacvlanFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMInfinibandFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMGreFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMEthernetFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMBridgeFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMBondFactory (internal)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMAtmManager (/usr/lib64/NetworkManager/libnm-device-plugin-adsl.so)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Loaded device plugin: NMTeamFactory (/usr/lib64/NetworkManager/libnm-device-plugin-team.so)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  WiFi enabled by radio killswitch; enabled by state file
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  WWAN enabled by radio killswitch; enabled by state file
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  WiMAX enabled by radio killswitch; enabled by state file
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  Networking is enabled by state file
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  (enp0s3): new Ethernet device (carrier: OFF, driver: 'e1000', ifindex: 2)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  (enp0s3): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  (enp0s3): link connected
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  (lo): link connected
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  (lo): new Generic device (carrier: ON, driver: 'unknown', ifindex: 1)
Jun 24 23:55:19 agent1 NetworkManager[849]: <info>  (enp0s3): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
Jun 24 23:55:20 agent1 NetworkManager[849]: <info>  wpa_supplicant running
Jun 24 23:55:24 agent1 NetworkManager[849]: <info>  startup complete
Jun 24 23:55:24 agent1 systemd: Started Network Manager Wait Online.
Jun 24 23:55:25 agent1 systemd: Starting LSB: Bring up/down networking...
Jun 24 23:55:25 agent1 network: Bringing up loopback interface:  Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jun 24 23:55:25 agent1 network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jun 24 23:55:25 agent1 network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jun 24 23:55:25 agent1 network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jun 24 23:55:25 agent1 network: [  OK  ]
Jun 24 23:55:25 agent1 systemd: Started LSB: Bring up/down networking.
Jun 24 23:55:25 agent1 systemd: Reached target Network.
Jun 24 23:55:25 agent1 systemd: Starting Network.
Jun 24 23:55:25 agent1 systemd: Reached target Network is Online.
Jun 24 23:55:25 agent1 systemd: Starting Network is Online.
Jun 24 23:55:34 agent1 NetworkManager[849]: <info>  (virbr0): new Bridge device (carrier: OFF, driver: 'bridge', ifindex: 3)
Jun 24 23:55:35 agent1 NetworkManager[849]: <warn>  (virbr0-nic): failed to find device 4 'virbr0-nic' with udev
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): link connected
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): new Ethernet device (carrier: ON, driver: 'tun', ifindex: 4)
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): bridge port virbr0-nic was attached
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): enslaved to virbr0
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  ifcfg-rh: add connection in-memory (3d52e408-48ac-4832-806a-f7d7437dc4bd,"Wired connection 1")
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): created default wired connection 'Wired connection 1'
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  Auto-activating connection 'Wired connection 1'.
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): Activation: starting connection 'Wired connection 1' (3d52e408-48ac-4832-806a-f7d7437dc4bd)
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  NetworkManager state is now CONNECTING
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): device state change: prepare -> config (reason 'none') [40 50 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): device state change: config -> ip-config (reason 'none') [50 70 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  Activation (virbr0-nic) Beginning DHCPv4 transaction (timeout in 45 seconds)
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  dhclient started with pid 2571
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): device state change: unmanaged -> unavailable (reason 'connection-assumed') [10 20 41]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  ifcfg-rh: add connection in-memory (9e09f7e2-340e-43c9-bbcb-e32582c33943,"virbr0")
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): device state change: unavailable -> disconnected (reason 'connection-assumed') [20 30 41]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): Activation: starting connection 'virbr0' (9e09f7e2-340e-43c9-bbcb-e32582c33943)
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): device state change: prepare -> config (reason 'none') [40 50 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): device state change: config -> ip-config (reason 'none') [50 70 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): device state change: secondaries -> activated (reason 'none') [90 100 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  NetworkManager state is now CONNECTED_LOCAL
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0-nic): Activation: successful, device activated.
Jun 24 23:55:35 agent1 systemd: Starting Network Manager Script Dispatcher Service...
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): device state change: ip-config -> ip-check (reason 'none') [70 80 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): device state change: ip-check -> secondaries (reason 'none') [80 90 0]
Jun 24 23:55:35 agent1 NetworkManager[849]: <info>  (virbr0): device state change: secondaries -> activated (reason 'none') [90 100 0]
Jun 24 23:55:35 agent1 dhclient[2571]: receive_packet failed on virbr0-nic: Network is down
Jun 24 23:55:35 agent1 systemd: Started Network Manager Script Dispatcher Service.
Jun 24 23:55:36 agent1 NetworkManager[849]: <info>  (virbr0): Activation: successful, device activated.
Jun 24 23:55:36 agent1 NetworkManager[849]: <info>  (virbr0-nic): link disconnected (deferring action for 4 seconds)
Jun 24 23:55:39 agent1 NetworkManager[849]: <info>  (virbr0-nic): link disconnected (calling deferred action)
Jun 24 23:55:42 agent1 dhclient[2571]: send_packet: Network is down
Jun 24 23:55:53 agent1 dhclient[2571]: send_packet: Network is down
Jun 24 23:56:08 agent1 dhclient[2571]: send_packet: Network is down
Jun 24 23:56:19 agent1 NetworkManager[849]: <warn>  (virbr0-nic): DHCPv4 request timed out.
Jun 24 23:56:19 agent1 NetworkManager[849]: <info>  (virbr0-nic): DHCPv4 state changed unknown -> timeout
Jun 24 23:56:20 agent1 NetworkManager[849]: <info>  (virbr0-nic): canceled DHCP transaction, DHCP client pid 2571
Jun 24 23:56:20 agent1 NetworkManager[849]: <info>  (virbr0-nic): DHCPv4 state changed timeout -> done
Jun 24 23:56:20 agent1 NetworkManager[849]: <info>  (virbr0-nic): device state change: activated -> failed (reason 'ip-config-unavailable') [100 120 5]
Jun 24 23:56:20 agent1 NetworkManager[849]: <info>  (virbr0): detached bridge port virbr0-nic
Jun 24 23:56:20 agent1 NetworkManager[849]: <info>  (virbr0-nic): released from master virbr0
Jun 24 23:56:20 agent1 NetworkManager[849]: <warn>  (virbr0-nic): Activation: failed for connection 'Wired connection 1'
Jun 24 23:56:20 agent1 NetworkManager[849]: <info>  (virbr0-nic): device state change: failed -> disconnected (reason 'none') [120 30 0]
Jun 24 23:56:20 agent1 systemd: Starting Network Manager Script Dispatcher Service...
Jun 24 23:56:20 agent1 systemd: Started Network Manager Script Dispatcher Service.
[root@agent1 ~]#
To add few cents I just did google and Google Lord says run command dhclient which fixed my issue. This however doesn't give me any clue why it started working and not before.

All I want a static IP so I guess I just want eth0, I am not sure what is enp0s3, lo,virbr0,virbr0 is.

Please see output from server again:
Code:
jim@agent1 ~]$ su - root
Password:
Last login: Fri Jun 24 23:57:08 AEST 2016 on pts/1
[root@agent1 ~]# ping -c 5 google.com
ping: unknown host google.com
[root@agent1 ~]# ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 08:00:27:f0:e0:47  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 00:00:00:00:00:00  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@agent1 ~]# dhclient
[root@agent1 ~]# ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.2.15  netmask 255.255.255.0  broadcast 10.0.2.255
        inet6 fe80::a00:27ff:fef0:e047  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:f0:e0:47  txqueuelen 1000  (Ethernet)
        RX packets 4  bytes 1830 (1.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 33  bytes 6199 (6.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 00:00:00:00:00:00  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0-nic: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 52:54:00:44:89:62  txqueuelen 500  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@agent1 ~]# ping -c 2 google.com
PING google.com (220.244.223.108) 56(84) bytes of data.
64 bytes from 220-244-223-108.tpgi.com.au (220.244.223.108): icmp_seq=1 ttl=58 time=102 ms
64 bytes from 220-244-223-108.tpgi.com.au (220.244.223.108): icmp_seq=2 ttl=58 time=15.9 ms


--- google.com ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4011ms
rtt min/avg/max/mdev = 15.944/38.400/102.543/32.618 ms
[root@agent1 ~]#
Honestly I have no idea what is happening with my network...

I want a static IP + able to access internet on command line + access internet on browser.

Any help would be very much appreciated.

Emerson 06-25-2016 05:39 AM
enp0s3 is your wired NIC, see unpredictable network interface names.

AwesomeMachine 06-25-2016 07:26 AM
It looks like you have /etc/network/interfaces configured for the ethernet connection AND network-manager is trying to get in there too. In virtualbox, you can either piggyback a network connection with a NAT configuration, or give the virtual machine it's own IP with a bridged setup. But the host must have an IP available.

Network-manager calls interfaces configured in the "interfaces" file, "managed". So, the interface is unmanaged by network-manager, reason being: it is managed by ifupdown (interfaces file). So, I'd take the static assignment out of interfaces and configure it in network-manager. Otherwise, if you use network-manager at all, none of the interfaces assignments will work unless you manually bring them up with ifup.

sysmicuser 06-25-2016 11:54 AM
Actually , I yet don't know the problem. But I have found out a work around or may be the solution.

If I sudo to root(sudo su - root) and type in dhclient, I get the stuff working. Access to internet via command line as well as browser.

I ran nmtui (Network Manager text user interface) and fixed the enp0s3 name as eth0 as well as device name + fixed IP in same GUI and I can see in /etc/sysconfig/network/ifcfg-enp0s3 file but still ip addr shows old IP. Plus I am not sure why I see ifcfg-enp0s3 file. I thought It gets replaced by ifcfg-eth0 file.

Moreover unless I do dhclient as root I don't get access to internet.

Looks like something caused by Network Manager. I tried to disable NetworkManager so that network can work but that's even more worst as enp0s3 is not up in that instance.

All in all in complete state of confusion................
There is no file like /etc/network/interfaces, I am using CentOS7 and I believe its a big jump from CentOS 6.X

AwesomeMachine 07-02-2016 01:51 AM
OK, sorry. Try
Code:
/etc/sysconfig/network-scripts/
instead of /etc/network/interfaces. DHCLIENT is probably just reconfiguring the network interface. You could use ifconfig also.


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