Fwd: [CLUG] network card id switching

[freegazer]

l

---------- Forwarded message ----------
From: freegazer <freegazer at gmail.com>
Date: Jun 11, 2006 10:05 AM
Subject: Re: [CLUG] network card id switching
To: steve at nerdvana.org.au

On 6/10/06, Steve Walsh <steve at nerdvana.org.au> wrote:

>  Would it possible to use a live CD prior to build to obtain Mac Address,
> which could then be used by ifcfg-ethX? Perhaps a bit more of an explanation
> of exactly how the system will be rolled out may be worthwhile? if you knew
> the Mac Addresses in advance, perhaps you could write a script, or may have;
>
> *Initial boot, IP is set by DHCP along with hostname being Mac address
> specific
> *script runs and says "this hostname should have eth0 with this mac
> address, and eth1 with this mac address. It that right?"
> *<insert script-foo here>
> *open beer
>
> maybe grab a coffee one day this week and have a chat about it?
>
> Steve "RHCT with the ink still wet" Walsh
>

this process would work but would involve too many man-hours to bo
applicable.

the core issue here is that the twin - nic machines would have one PCI nic
and one onboard nic.
currently all the distro's I have looked at by default do PCI probing before
nic setup and therefore all the pci cards are set to eth0. In this situation
we _need_ them to be id'd as eth1 and the mobo to be eth0.

as an example on my home system (not RH) the following order is used
(shortened to pertanent info only) in rc3.d:

s05harddrake
(h/w conf)
....
s10network
(network conf)

if I remember correctly during Bob's presentation he was saying that one the
Debian diskless he moved the network scripts to earlier in the process. this
sidestepped all the card renaming due to where it was discovered by the
hardware probe. also not having to rename the cards after first
configuration occoured.
please let me know if you can confirm that i am remembering this wrong

 -----Original Message-----
> *From:* freegazer [mailto:freegazer at gmail.com]
> *Sent:* Saturday, 10 June 2006 10:06 AM
> *To:* steve at nerdvana.org.au
> *Subject:* Re: [CLUG] network card id switching
>
> Steve,
> Setting the eth designation weth the ifcfg files definately would do what
> I need on a single unchanging machine, my understanding is that this
> requires the mac address of card, the problem is that I would need to be
> putting this into an image that would be pushed out to several machines so I
> can't set the mac in advance. also i beleive that system-network-config just
> sets the same file up so same problem would occour. In addition If I
> remember the discussion correctly it was brought up and Bob was saying that
> this rewrites the existing designations quite late in the boot process. for
> the setup I am looking at the cards would need to start at the correct
> address rather than be modified to it after it had been running for awhile.
>
> On 6/9/06, Steve Walsh <steve at nerdvana.org.au> wrote:
> >
> > You can define the Ethernet address in redhat (Fedora and EL) using the
> > /etc/sysconfig/network-scripts/ifcfg-ethX file, which contains the
> > device's
> > mac address.
> >
> > This binds that card designation to it's address. If you need to config
> > anythis else, you can use the "neat" config tool, or
> > system-config-network.
>
>
>
>
> Francis,  if this is possible do you know if this avoids would avoid the
> issues raised above?
>
> -----Original Message-----
> > From: Francis James Whittle [mailto: FJ.Whittle at gmail.com]
> > Sent: Friday, 9 June 2006 6:43 PM
> > To: linux at lists.samba.org
> > Subject: Re: [CLUG] network card id switching
> >
> >
> > If I understand correctly, it's actually possibly to bring up the
> > configuration of an interface (and, in fact, rename it if you're using
> > kernel 2.6 [with sysfs?]) according to its MAC address.
> >
> > On Fri, 2006-06-09 at 17:50 +1000, freegazer wrote:
> > > I will soon need to do a bit of work on some dual nic'd machines. I
> > remember
> > > during the recent presentation on diskless booting that there was more
> > than
> > > a little discussion on the problem of nic addresses changing at boot
> > time.
> > > If memory serves right Bob mentioned that he resolved the issue be
> > changing
> > > the default boot sequence for Debian so that the cards would keep the
> > same
> > > "eth" location.
> > > Does anyone know of an article on this? Or perhaps is there a chance
> > sombody
> > > kept reasonable notes?
> > > The systems need to be running RH rather than Debian so I don't know
> > if
> > > exactly the same fix will work but I would like to look into it.
> > >
> >
> > --
> > linux mailing list
> > linux at lists.samba.org
> > https://lists.samba.org/mailman/listinfo/linux
> >
> >
> > --
> > linux mailing list
> > linux at lists.samba.org
> > https://lists.samba.org/mailman/listinfo/linux
> >
>
>
>
> --
> by ipxodi (156633) on Tuesday August 23, @07:47AM (#13378220) (
> http://slashdot.org/)
> Duct tape is one of the sacred triumvirate of the Most Important Tools in
> the World. Use the Tool Triumvirate thusly:
> 1) If it moves and it shouldn't -- use Duct Tape.
> 2) If it doesn't move and it should -- use WD-40.
> 3) If it should sometimes move -- use Velcro.
>




-- 
by ipxodi (156633) on Tuesday August 23, @07:47AM (#13378220) (
http://slashdot.org/)
Duct tape is one of the sacred triumvirate of the Most Important Tools in
the World. Use the Tool Triumvirate thusly:
1) If it moves and it shouldn't -- use Duct Tape.
2) If it doesn't move and it should -- use WD-40.
3) If it should sometimes move -- use Velcro.