[ale] IP Address reconfigruation in Cent OS 5 (RHEL 5.0)

Jerald Sheets questy at gmail.com
Sun May 13 23:34:20 EDT 2007


Good call, Bob.  On the outside chance the Redhat utilities are not  
working right and disabling dhcp when you configure it, that would be  
a logical step along the way.  I was hoping the utilities would  
accomplish what he needed.

--j



On May 13, 2007, at 11:27 PM, Bob Toxen wrote:

> I'll take a wild guess and suggest that you verify that your DHCP  
> client
> daemon has been disabled in /etc/rc.d/rc3.d.
>
> Bob Toxen
> bob at verysecurelinux.com               [Please use for email to me]
> http://www.verysecurelinux.com        [Network&Linux/Unix security  
> consulting]
> http://www.realworldlinuxsecurity.com [My book:"Real World Linux  
> Security 2/e"]
> Quality Linux & UNIX security and SysAdmin & software consulting  
> since 1990.
>
> "Microsoft: Unsafe at any clock speed!"
>    -- Bob Toxen 10/03/2002
>
> On Sun, May 13, 2007 at 09:16:38PM -0400, Paul Borghese wrote:
>> Thanks for the suggestion but does not help.  When I run the
>> system-config-network-tui command it creates a new ifcfg-eth0 file  
>> with
>> the static IP address.
>>
>> But when I reboot, the file has been changed to a DHCP configuration.
>>
>> Also something else strange.  It seems as if the mac address  
>> changes with
>> every reboot.
>>
>> Interesting, huh?
>>
>> Paul Borghese
>>
>>> in /usr/sbin there are a series of utilities that also take into
>>> account the redhat style network profiles and everything else.
>>>
>>> they are:
>>>
>>> system-config-network-tui
>>> system-config-network-gui
>>>
>>> These allow you to interactively reconfigure the networking, and  
>>> they
>>> permanently rewrite all the profile files that contain networking
>>> information.
>>>
>>> Sure, an odd way to do things, but the redhat way, to be sure.
>>>
>>> --j
>>>
>>>
>>>
>>> On May 13, 2007, at 12:09 PM, Paul Borghese wrote:
>>>
>>>> Hi Everyone,
>>>>
>>>>
>>>>
>>>> I have a crazy problem with a Cent OS 5 (RHEL 5.0) server.  I am
>>>> trying to statically configure my ip address, but the server will
>>>> not allow it.  I have edited the file /etc/sysconfig/network-
>>>> scripts/ifcfg-eth0 to read the following:
>>>>
>>>>
>>>>
>>>> DEVICE=eth0
>>>>
>>>> ONBOOT=yes
>>>>
>>>> BOOTPROTO=none
>>>>
>>>> HWADDR=00:00:6c:3c:e5:f6
>>>>
>>>> NETMASK=255.255.255.0
>>>>
>>>> IPADDR=172.16.1.44
>>>>
>>>> GATEWAY=172.16.1.1
>>>>
>>>> TYPE=Ethernet
>>>>
>>>> USERCTL=no
>>>>
>>>> IPV6INIT=no
>>>>
>>>> PEERDNS=yes
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Everything works perfect. I am able to stop and restart the network
>>>> process (/etc/rc.d/init.d/network restart) without error.  I can
>>>> also manually bring the interface up/down using ifup eth0 and
>>>> ifdown eth0 without issue.  In both cases the IP address is
>>>> statically configured just as desired.
>>>>
>>>>
>>>>
>>>> But here is the problem.  When I reboot the server, the file ifcfg-
>>>> eth0 is automatically changed to a configuration that points to a
>>>> DHCP server.  So after a reboot, my box is using a DHCP server to
>>>> obtain addressing.  The original file is saved as ifcfg-eth0.bak.
>>>>
>>>>
>>>>
>>>> As a stop-gap measure, I could use an ifconfig statement in
>>>> rc.local to reset the IP address to the correct value.  But I would
>>>> really like to find out what is the problem and the philosophy for
>>>> the configuration change.
>>>>
>>>>
>>>>
>>>> I think it might have something to do with virtualization.  When I
>>>> installed the system, I selected to install the virtualization
>>>> packages thinking it would be something fun to experiment.  Later I
>>>> uninstalled the virtualization packages as I needed all available
>>>> memory for a program I need to run.
>>>>
>>>>
>>>>
>>>> Once I get a free minute, I plan to read through the rc scripts to
>>>> see if I can find anything, but any suggestions would be greatly
>>>> appreciated.
>>>>
>>>>
>>>>
>>>> Thanks!
>>>>
>>>>
>>>>
>>>> Paul Borghese
>>>>
>>>>
>>>>
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