[CentOS] Network manager cannot connet to the Internet

Tue Sep 6 22:39:57 UTC 2016
Gordon Messmer <gordon.messmer at gmail.com>

On 09/03/2016 03:08 AM, sunyeping wrote:
> But when I give "ifconfig" command in a gnome terminal, the output information seems to be correct:
> [sunyp at localhost Desktop]$ ifconfig
> ...
> eth1      Link encap:Ethernet  HWaddr 00:25:90:72:E2:87
>            inet6 addr: fe80::225:90ff:fe72:e287/64 Scope:Link
>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>            RX packets:49 errors:0 dropped:0 overruns:0 frame:0
>            TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:16386 (16.0 KiB)  TX bytes:3038 (2.9 KiB)
>            Interrupt:17 Memory:fafe0000-fb000000

You don't have any valid IPv4 or IPv6 addresses.  Normally those things 
are provided by your router.  Check your cabling first. Then check your 
router's logs to see if it's getting DHCP requests from your desktop.