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

[Bob Toxen]

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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> >
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> 
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