[olug] Changing eth0 & eth1 around (in linux, of course!)

[Joe Catanzaro]

To logically switch the interfaces on a RH 7.x system:

ifdown eth0
ifdown eth1
mv /etc/sysconfig/network-scripts/ifcfg-eth0 
/etc/sysconfig/network-scripts/ifcfg-eth0.tmp
mv /etc/sysconfig/network-scripts/ifcfg-eth1 
/etc/sysconfig/network-scripts/ifcfg-eth0
mv /etc/sysconfig/network-scripts/ifcfg-eth0.tmp 
/etc/sysconfig/network-scripts/ifcfg-eth1
ifup eth0
ifup eth1


At 10/4/02 11:18 PM Friday, Daniel Pfile wrote:
>If I read your email correctly, the chip on your built in ethernet is
>toast and you want to use the pci card you have in your machine for
>network access.
>
>Have you checked your bios to see if you can disable ethernet? It's
>usually in the onboard peripherals setting someplace. That's what I do
>when things like on board sound and a sound card don't play nice.
>
>On Fri, 2002-10-04 at 22:39, Don E. Kauffman wrote:
> > I wish it were that simple. The TLAN is built in and is therefoire not
> > amenable to switching -- or am I missing something??
> >
> > Don K.
> >
> > On Friday 04 October 2002 10:32 pm, you wrote:
> > > I don't know the answer but I've had a hunch that swapping the physical
> > > locations of the cards might accomplish that.  However I haven't had the
> > > opportunity/need to test that hunch.
> > >
> > > On Friday 04 October 2002 09:35 pm, (Via wrote:
> > > > Howdy,
> > > >
> > > > I've had a problem with the networking on the linux box. I have a TLAN
> > > > (eth0) built in -- and it does not seem to be functioning anymore --
> > > > along with a D-link (eth1)  I spent all day yesterday off the net 
> trying
> > > > to figure out how I could reconfigure the system to have the D-Link be
> > > > eth0 and assign eth1 to TLAN.  I ffinally noticed in the man page on
> > > > dhcpcd that I could change the interface that dhcp was "attached" to.
> > > > Hence I am now able to connect again!!
> > > >
> > > > Is there a way to flipflop the two interfaces? Here's what I've 
> tried so
> > > > far.
> > > >
> > > > 1. Changed the aliases in modules.conf from this
> > > > alias eth0 tlan
> > > > alias eth1 8139too
> > > >
> > > > to this
> > > > alias eth0 8139too
> > > > alias eth1 tlan
> > > >
> > > > and rebooted the machine. dmesg showed that it was still regarding the
> > > > tlan as eth0.
> > > >
> > > > 2. Used the network configuration GUI in RH 7.2 to reconfigure the tlan
> > > > to eth1. Looked at the ifconfig output for eth0 and it shows tlan.
> > > >
> > > > 3. recompiled the kernel to compile the ethernet modules separately 
> trom
> > > > the kernel. (I compiled the RH7.2  2.4.9-34 version of the kernel.)
> > > >
> > > > 4. On reboot, dmesg still shows the system as setting eth0 to the tlan.
> > > >
> > > > 5. I modprobed the respective modules into the kernel and found I 
> had to
> > > > re-configure the routing tables. The RH network confiuguration GUI 
> shows
> > > > that the tlan is eth1 and the D-Link as eth0. (I'm beginning to thiink
> > > > that particular tool bears only a faint resemblence to reality . . .)
> > > >
> > > > It's not a big deal if I can't get the tlan setup as eth1 now that 
> I know
> > > > I can get the same results by having dhcp interface with the D-Link on
> > > > eth1 but it would be nice to know if I'm missing anything, So 
> please make
> > > > suggestions or, at least, let me know if what I want to do isn't
> > > > possible.
> > > >
> > > > Thanks!
> > > >
> > > > Don Kauffman
> > > > _______________________________________________
> > > > OLUG mailing list
> > > > OLUG at olug.org
> > > > http://lists.olug.org/mailman/listinfo/olug
> > >
> > > _______________________________________________
> > > OLUG mailing list
> > > OLUG at olug.org
> > > http://lists.olug.org/mailman/listinfo/olug
> > _______________________________________________
> > OLUG mailing list
> > OLUG at olug.org
> > http://lists.olug.org/mailman/listinfo/olug
>--
>-- Daniel Pfile - daniel AT pfile DAWT net
>
>_______________________________________________
>OLUG mailing list
>OLUG at olug.org
>http://lists.olug.org/mailman/listinfo/olug


Joe Catanzaro
joecatanzaro at cox.net