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Old 05-03-2015, 07:28 AM   #1
s.s
LQ Newbie
 
Registered: May 2015
Posts: 3

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Network problem in SL 6.6


Hi all,

I downloaded Scientific Linux 6.6, but it didn't connect to internet.

There is a wrong sign on the "internet icon" on the start up bar and
when I click on this icon i find the wired connection closed (I can't click on), also the cable connected to the laptop dose not flash.

When I enter > system > network connections, I find wired system eth0 connection, in which the MAC address set to 00:00:00:00:00:00, while "Apply" icon is not activated


Here is the output of $ifconfig

lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:40 errors:0 dropped:0 overruns:0 frame:0 TX packets:40 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2880 (2.8 KiB) TX bytes:2880 (2.8 KiB)


virbr0 Link encap:Ethernet HWaddr 52:54:00:EE:44:CD
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)



Here is the output of $ifconfig eth0

eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

The eth0 cofiguration file on /etc/sysconfig/network-scripts/ifcfg-eth0

TYPE=Ethernet
UUID=48b4edd8-26a9-427e-abad-b4acac8e42ee
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
HWADDR=52:54:00:EE:44:CD
PEERDNS=yes
PEERROUTES=yes

And when I type ifup eth0
[root@localhost network-scripts]# ifup eth0
Error: No suitable device found: no device found for connection 'System eth0'

Note that when I change the MAC address on
system> network connections > system eth0 to : 52:54:00:EE:44:CD, the Apply icon activated but the problem didn't solved ..



So any help ..
thanx
S.

Last edited by s.s; 05-03-2015 at 07:32 AM.
 
Old 05-04-2015, 03:04 PM   #2
lazydog
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Registered: Dec 2003
Location: The Key Stone State
Distribution: CentOS Sabayon and now Gentoo
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Why do you have a Virtual Bridge configured? Looking at your output both the virbr0 and eth0 have the same mac address.
 
Old 05-04-2015, 10:14 PM   #3
s.s
LQ Newbie
 
Registered: May 2015
Posts: 3

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I don't know why.. I just installed Linux normally, also i wonder why the HWaddr number in ifcfg-eth0 file is different than when i type ifconfig eth0?

Any ideas, because actually I'm not expert in SC Linux..

Best,
S.
 
Old 05-05-2015, 07:22 AM   #4
lazydog
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post the output of the following command:

Code:
ifconfig -a
This will show all known interfaces
 
Old 05-05-2015, 12:46 PM   #5
s.s
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Registered: May 2015
Posts: 3

Original Poster
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Here is it:

$ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:28 errors:0 dropped:0 overruns:0 frame:0
TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1920 (1.8 KiB) TX bytes:1920 (1.8 KiB)

pan0 Link encap:Ethernet HWaddr 92:61:35: D6:73:04
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

virbr0 Link encap:Ethernet HWaddr 52:54:00:EE:44:CD
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

virbr0-nic Link encap:Ethernet HWaddr 52:54:00:EE:44:CD
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

Best,
S.

Last edited by s.s; 05-05-2015 at 12:51 PM.
 
Old 05-05-2015, 02:54 PM   #6
lazydog
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Registered: Dec 2003
Location: The Key Stone State
Distribution: CentOS Sabayon and now Gentoo
Posts: 1,249
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Rep: Reputation: 194Reputation: 194
What config files do you have in /etc/sysconfig/network-scripts/? Can you post this output also?
Code:
ls -al
 
  


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