I am totally new to using CentOS. Linux in Genera really. I have decent experiencing with terminal code for Macs though.
Here's the deal my Boss wants us to move more toward linux for some of our basic users. All I was supposed to do was install CentOS 5.2 and Open Office and disburse the machines. Simple enough right. So I did this with no issue. I ran the interface and installed only GNOME and KDE. After installation was complete I activated the eth-0 and had it on DHCP. I connected to the net fine and began downloading open office. I left for the day and came back and I can no longer get back online. The eth-0 wont even activate unless I manually enter a static IP but still can not establish a connection online. I treid reinstalling to no avail. Even built a completely new box and still no avail. I am using CentOS 5.2 i386 DVD.
Like I said I am new to this so any guidance would be appreciated to get me into the Linux world. Thank you.
On Thu, Sep 18, 2008 at 6:08 PM, Joey Mendez jmendez@ucsd.edu wrote:
I am totally new to using CentOS. Linux in Genera really. I have decent experiencing with terminal code for Macs though.
Jose: Welcome!
Here's the deal my Boss wants us to move more toward linux for some of our basic users. All I was supposed to do was install CentOS 5.2 and Open Office and disburse the machines. Simple enough right. So I did this with no issue. I ran the interface and installed only GNOME and KDE. After installation was complete I activated the eth-0 and had it on DHCP. I connected to the net fine and began downloading open office. I left for the day and came back and I can no longer get back online. The eth-0 wont even activate unless I manually enter a static IP but still can not establish a connection online. I treid reinstalling to no avail. Even built a completely new box and still no avail. I am using CentOS 5.2 i386 DVD.
Like I said I am new to this so any guidance would be appreciated to get me into the Linux world. Thank you.
Linux is based on UNIX and networking started there. Networking will work for you!
I normally install both GNOME and KDE, but 99% of the time, I use GNOME. When I install from a DVD, I install the majority of Applications and Systems things I want at that time. Then, in a Terminal Window (as root), do "yum update" to update everything to the latest version, for Security and Stability reasons.
In GNOME, at the lower left hand corner, click on System > Administration >Network and enter the password for root (the super user). That brings you to a GUI utility called system-config-network Be sure that eth0 is shown as "Active" and then highlight it and click on "Edit". Be sure that "Activate Device when computer starts is checked". And, "Automatically obtain IP with DHCP". And, Automatically obtain DNS.
A book I can recommend to you, would be the edition that covers Red Hat Enterprise Linux 5, of "Red Hat Fedora and Enterprise Linux Bible" by Christopher Negus. I'm sure that there are other excellent books, but this one will explain a lot to you. I think the version that covers RHEL 5 (CentOS is a rebuild of RHEL) is "Fedora 6 and Red Hat Enterprise Linux Bible", however you need to verify that, before you buy it, because I have an older version of the book. Please note that much of the book is about Fedora Core. Red Hat Enterprise Linux takes the best of Fedora Core and is a much more stable distribution, without the "latest and greatest". So, the book will help you with CentOS, because CentOS is a rebuild of RHEL.
HTH, Lanny in Colombia
I appreciate your reply to my email. The steps ou have given me are things that I have done and are already in place. I still cannot get the eth to activate unless I issue it a static IP it for some reason will not activate under the DHCP selection. Has anyone ever experienced this.
If I do assign it an IP it will activate but still has no internet connection. I can ping itself but cannot ping any machine outside of it or have a machine outside be able to ping it.
Lanny Marcus wrote:
On Thu, Sep 18, 2008 at 6:08 PM, Joey Mendez jmendez@ucsd.edu wrote:
I am totally new to using CentOS. Linux in Genera really. I have decent experiencing with terminal code for Macs though.
Jose: Welcome!
Here's the deal my Boss wants us to move more toward linux for some of our basic users. All I was supposed to do was install CentOS 5.2 and Open Office and disburse the machines. Simple enough right. So I did this with no issue. I ran the interface and installed only GNOME and KDE. After installation was complete I activated the eth-0 and had it on DHCP. I connected to the net fine and began downloading open office. I left for the day and came back and I can no longer get back online. The eth-0 wont even activate unless I manually enter a static IP but still can not establish a connection online. I treid reinstalling to no avail. Even built a completely new box and still no avail. I am using CentOS 5.2 i386 DVD.
Like I said I am new to this so any guidance would be appreciated to get me into the Linux world. Thank you.
Linux is based on UNIX and networking started there. Networking will work for you!
I normally install both GNOME and KDE, but 99% of the time, I use GNOME. When I install from a DVD, I install the majority of Applications and Systems things I want at that time. Then, in a Terminal Window (as root), do "yum update" to update everything to the latest version, for Security and Stability reasons.
In GNOME, at the lower left hand corner, click on System > Administration >Network and enter the password for root (the super user). That brings you to a GUI utility called system-config-network Be sure that eth0 is shown as "Active" and then highlight it and click on "Edit". Be sure that "Activate Device when computer starts is checked". And, "Automatically obtain IP with DHCP". And, Automatically obtain DNS.
A book I can recommend to you, would be the edition that covers Red Hat Enterprise Linux 5, of "Red Hat Fedora and Enterprise Linux Bible" by Christopher Negus. I'm sure that there are other excellent books, but this one will explain a lot to you. I think the version that covers RHEL 5 (CentOS is a rebuild of RHEL) is "Fedora 6 and Red Hat Enterprise Linux Bible", however you need to verify that, before you buy it, because I have an older version of the book. Please note that much of the book is about Fedora Core. Red Hat Enterprise Linux takes the best of Fedora Core and is a much more stable distribution, without the "latest and greatest". So, the book will help you with CentOS, because CentOS is a rebuild of RHEL.
HTH, Lanny in Colombia _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos .
On Fri, Sep 19, 2008 at 8:43 PM, Joey Mendez jmendez@ucsd.edu wrote:
I appreciate your reply to my email. The steps ou have given me are things that I have done and are already in place. I still cannot get the eth to activate unless I issue it a static IP it for some reason will not activate under the DHCP selection. Has anyone ever experienced this.
If I do assign it an IP it will activate but still has no internet connection. I can ping itself but cannot ping any machine outside of it or have a machine outside be able to ping it.
Hi,
For internet to work properly dns servers needs to be entered if you are using static ipaddress. Open the terminal and edit /etc/resolv.conf file through any text editor and enter dns servers
domain example.com # Incase you want this domain to be your default domain nameserver xx.xx.xx.xx # Dns Server ipaddress or hostname nameserver xx.xx.xx.xx # DNS Server ipadddress or hostname
save the file and restart nscd service
service nscd restart
As you mentioned you are not able to ping the machine outside kindly check the firewall rules aka iptables.
iptables -L
If you don't want to use iptables or firewall on this machine then run the below commands
iptables -F
service iptables save
chkconfig iptables off
Now check the network connectivity by pinging other machines.
Note: You need to be root to perform the above steps
Regards
Ankush
Joey Mendez wrote:
I appreciate your reply to my email. The steps ou have given me are things that I have done and are already in place. I still cannot get the eth to activate unless I issue it a static IP it for some reason will not activate under the DHCP selection. Has anyone ever experienced this.
If I do assign it an IP it will activate but still has no internet connection. I can ping itself but cannot ping any machine outside of it or have a machine outside be able to ping it.
What kind of network card? what network chip, what driver is being used?
My best guess at this point is the driver doesn't fully support the network card so traffic cannot pass. Maybe the card is too new.
Run ethtool eth0 (assuming your using eth0), and verify there is a link detected as well.
nate
nate wrote:
Joey Mendez wrote:
I appreciate your reply to my email. The steps ou have given me are things that I have done and are already in place. I still cannot get the eth to activate unless I issue it a static IP it for some reason will not activate under the DHCP selection. Has anyone ever experienced this.
If I do assign it an IP it will activate but still has no internet connection. I can ping itself but cannot ping any machine outside of it or have a machine outside be able to ping it.
What kind of network card? what network chip, what driver is being used?
Realtek 8111/8168b module 8169
No link detected.
When I attempt to install the driver that came on the CD with the box r8168-8.006.00. Once I get to the step to Make Clean Modules all I get is errors
My best guess at this point is the driver doesn't fully support the network card so traffic cannot pass. Maybe the card is too new.
Run ethtool eth0 (assuming your using eth0), and verify there is a link detected as well.
nate
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Joey Mendez wrote:
When I attempt to install the driver that came on the CD with the box r8168-8.006.00. Once I get to the step to Make Clean Modules all I get is errors
Do you have the kernel-devel package for your kernel installed?
yum install kernel-devel-`uname -r` kernel-headers-`uname -r`
And try the module build again, if it fails post the output of the command. You could configure a serial console and access the system that way in order to copy/paste, or perhaps install CentOS in a VM and try to compile the module there so you can get the error from the compile.
But it may be easier/better to get another NIC. Realtek doesn't have a good history of making stable NICs under linux/*bsd.
nate
On Fri, Sep 19, 2008 at 5:15 PM, Joey Mendez jmendez@ucsd.edu wrote: <snip>
What kind of network card? what network chip, what driver is being used?
Realtek 8111/8168b module 8169
I googled and came up with this thread that might be of interest to you: http://www.centos.org/modules/newbb/viewtopic.php?topic_id=12467 <snip>
On Fri, Sep 19, 2008 at 10:13 AM, Joey Mendez jmendez@ucsd.edu wrote:
I appreciate your reply to my email. The steps ou have given me are things that I have done and are already in place. I still cannot get the eth to activate unless I issue it a static IP it for some reason will not activate under the DHCP selection. Has anyone ever experienced this.
If I do assign it an IP it will activate but still has no internet connection. I can ping itself but cannot ping any machine outside of it or have a machine outside be able to ping it.
Jose: Two things: (a) please do not TOP POST on this mailing list. (b) I wonder if the NIC is working properly? If it's an onboard NIC, can you disable it and install another NIC, to see if you have connectivity? If it's a PCI card, pull it out and install another NIC, preferably another model. Lanny
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Joey Mendez Sent: Friday, 19 September 2008 9:09 AM To: centos@centos.org Subject: [CentOS] Network issues with CentOS 5.2
Snip
DHCP. I connected to the net fine and began downloading open office. I left for the day and came back and I can no longer get back online. The eth-0 wont even activate unless I manually enter a static IP but still can not establish a connection online. I treid reinstalling to no avail. Even built a completely new box and still no avail. I am using CentOS 5.2 i386 DVD.
I experienced something similar and it turned out that if you run an update and the kernel changes, then you need to update the network drivers to match up with the installed kernel.
If you provide details on the type of NIC on your system, I may be able to provide more help.
Cheers, AK.
-
ankush grover -
Anthony Kamau -
Joey Mendez -
Lanny Marcus -
nate