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Old 07-06-2009, 04:29 AM   #1
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cannot connect to internet from centos machine

Hi there
just new to the linux world. struggling to get through this in the shortest time. i have this problem disturbing me, don't know if any one can help.
i just did dual booting on my pc; on one partiton i install windows vista and on the other, i install centOS 5. windows partion can connect to the internet but the centOS 5 cannot. i even tried to change the speed on the network card from 1000mbps to 100mbps on the centos partition but it is refusing to change

Last edited by mbanwi; 07-06-2009 at 04:33 AM.
Old 07-06-2009, 05:46 AM   #2
Registered: Oct 2003
Location: UnitedKingdom
Distribution: Debian Lenny
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you need not have to change the speed and most of the times the hardware auto-negotiates the speed.
if you say that you are not connected do you mean to say that the link is not up ?

may be from console you can login as root and paste us the output of
# ifconfig -a
this can help us find out issues with the ip addresses ...
Old 07-08-2009, 06:28 AM   #3
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i entered the follwing 2 command and got this:

[root@stanley ~]#ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:1F:299:18:64
inet addr: Bcast: Mask:
RX packets:6 errors:0 dropped:3144420496 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:759 (759.0 b) TX bytes:0 (0.0 b)
Interrupt:177 Base address:0x4000

lo Link encap:Local Loopback
inet addr: Mask:
inet6 addr: ::1/128 Scope:Host
RX packets:29 errors:0 dropped:0 overruns:0 frame:0
TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2606 (2.5 KiB) TX bytes:2606 (2.5 KiB)

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 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)

[root@stanley ~]# ethtool eth0
Settings for eth0:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: Not reported
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
Link detected: no
Old 07-08-2009, 08:40 PM   #4
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Distribution: Centos 6.9, Centos 7.3
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I think we need to see your network files contents, see Method 3 here:


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