bringing up eth0:connection activation failed

**arvin1844** · 12-23-2011

bringing up eth0:connection activation failed

when trying "#service network restart" it showing an error
[/B]"Bringing up etho: Connection activation failed : Device not managed by Networkmanager "[/B]

In "#setup" i have given DHCP.
help me to fix this...

**atreyu** · 12-23-2011

I assume this is a wired, not wireless connection. Is the CAT5/network cable firmly plugged in? Do you have a physical link?

Code:

ethtool eth0|grep Link

I hate Network Manager, personally. Try turning it off:

Code:

chkconfig NetworkManager off
service NetworkManager stop
service network restart

Do you know that the DHCP server is available on the local LAN? Can you view the log to see if the client request is coming in okay? Are there rules defined for the DHCP server that prevent this client from making a connection (MAC filtering, etc.)?

**arvin1844** · 12-23-2011

I am afraid I am only a beginner in linux.
All that I know is I have connected my mobile with my lap for internet.
I have used it fine for some days.But suddenly something went wrong.I also tried by turning networkmanager off.
I can use internet very fine on windows since i have both windows and centos on my laptop...
anyway thanks for the help...is there something else...?I am still facing the issue...

**atreyu** · 12-23-2011

Originally Posted by arvin1844

All that I know is I have connected my mobile with my lap for internet.

Do you mean "tethering"? Let us know if you are, b/c that would be important. If not....

I have used it fine for some days.But suddenly something went wrong.I also tried by turning networkmanager off.
I can use internet very fine on windows since i have both windows and centos on my laptop...

Can you confirm if you are using a wireless connection via your laptop, versus a wired one? Typically, eth0 refers to wired network adapters, and wireless ones are usually wlan0, or ath0 (or even eth1 maybe).

To be sure, you can open a terminal (there should be a launcher for it from your panel), and do:

Code:

# change to root user (will prompt you for root password)
su -

# show all network devices
cat /proc/net/dev

# show current IP settings
ip a

# show wireless capable devices
iwconfig

# show routing table
route -n

# show DNS settings
cat /etc/resolv.conf

# show IP configuration file contents
grep -H . /etc/sysconfig/network-scripts/ifcfg-*

Have you rebooted into Windows to make sure it is still working on that side?

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