Centos 4 32 bit - New kernel ethX MAC address order issue Post: 302605199

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Operating Systems Linux Red Hat Centos 4 32 bit - New kernel ethX MAC address order issue Post 302605199 by anil510 on Tuesday 6th of March 2012 10:53:53 PM

03-06-2012

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Centos 4 32 bit - New kernel ethX MAC address order issue

I have compiled a new kernel (3.2.9) for centos 4/5/6 servers. There is an issue with the centos 4, 32 bit servers. The kernel changes the order in which the MAC address is determined and because of this the server network does not come up as the wrong MAC address are assigned. Even if we specify it correctly in /etc/sysconfig/network-scripts/ifcfg-eth* , kernel does not read it in the case of centos 4 during boot time. We passed using the ndev= parameter, that contain MAC address in the grub.conf file, this is also not doing good. Below is the way the old kernel identifies the MAC and new kernel identifies the MAC. My question is, Is there a way to change the order in which the kernel identifies the Card, so that it follows always the same sequence as in the Old kernel itself. Ie 00:xx:xx:xx:xx:2e will be always identified as eth0 and others also. You can see in the first case the lspci device �0000:03:08.0� is identified as eth0 and in the second case, �0000:03:08.0� is identified as eth2. I need 0000:03:08.0 always be identified as eth0 itself.

I have used the following in the file /etc/udev/rules.d/50-udev.rules Upon rebooting kernel seems to ignore it.

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:xx:xx:xx:xx:2e", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:xx:xx:xx:xx:20", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:xx:xx:xx:xx:21", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2"

PS: The same kernel works fine in centos 5/6 servers. Issue seen only in centos 4 servers.

First case: How old kernel identifies MAC in /var/log/messages during boot up.

---------------------------------------
Mar 6 07:34:03 server kernel: [ 7.800794] e100 0000:03:08.0: eth0: addr 0xfeafb000, irq 18, MAC addr 00:xx:xx:xx:xx:2e

Mar 6 07:34:03 server kernel: [ 7.817023] tg3 0000:02:09.0: eth1: Tigon3 [partno(BCM95704A7) rev 2003] (PCIX:100MHz:64-bit) MAC address 00:xx:xx:xx:xx:20

Mar 6 07:34:03 server kernel: [ 7.825107] tg3 0000:02:09.1: eth2: Tigon3 [partno(BCM95704A7) rev 2003] (PCIX:100MHz:64-bit) MAC address 00:xx:xx:xx:xx:21
---------------------------------------

Second case: How new kernel identifies MAC in /var/log/messages during boot up.

---------------------------------------
Mar 6 07:23:42 server kernel: tg3 0000:02:09.0: eth0: Tigon3 [partno(BCM95704A7) rev 2003] (PCIX:100MHz:64-bit) MAC address 00:xx:xx:xx:xx:20

Mar 6 07:23:42 server kernel: tg3 0000:02:09.1: eth1: Tigon3 [partno(BCM95704A7) rev 2003] (PCIX:100MHz:64-bit) MAC address 00:xx:xx:xx:xx:21

Mar 6 07:23:42 server kernel: e100 0000:03:08.0: eth2: addr 0xfeafb000, irq 18, MAC addr 00:xx:xx:xx:xx:2e

anil510

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LEARN ABOUT DEBIAN

setether

SETETHER(8)						      System Manager's Manual						       SETETHER(8)

NAME

       setether - Set the ethernet address for use with DECnet

SYNOPSIS

       setether <if> [<if>...]|all [options]

DESCRIPTION

       Set ethernet MAC address on ethernet adaptors

       This  script should be run at system startup. It will change the ethernet hardware (MAC) address of any or all ethernet interfaces to match
       the DECnet node address. DECnet requires that the MAC address of all ethernet adaptors running the protocol be set approriately.  If you do
       not run setether then you must change the ethernet address in some other way for DECnet to work.
       By  default no ethernet interfaces will have their MAC addresses changed by setether, if you specify all then all interfaces name eth* will
       be changed, otherwise a list of interface names can be specified.  setether will enable (UP) all interfaces it changes  the  MAC  addresses
       of.
       (2.4  only) The first interface specified on the command-line will also be made the default interface for DECnet operations (ie attempts to
       contact nodes not in the neighbour table will be done over this interface).
       This script must be run with the interface inactive, it is normally run from /etc/init.d/decnet before TCP/IP starts up.

EXAMPLES

       set the MAC address of eth0.

	   # /sbin/setether eth0

       set the MAC address of all ethernet interfaces

	   # /sbin/setether all

HELPFUL HINTS

       If you have multiple ethernet cards on your system and they are connected to the the same network you should specify which one you want	to
       use  for DECnet communication on the setether command line, otherwise they will both be given the same MAC address and this is probably not
       what you want.
       Running DECnet on multiple ethernet interfaces only works under Linux 2.4. If you are running Linux 2.2 then  the  interface  name  on  the
       setether command line must match the one in /etc/decnet.conf(5).

SEE ALSO

       decnet.conf(5), dntype(1), dndir(1), dndel(1), dnetd(8), dnping(1)

DECnet utilities						   March 01 2001						       SETETHER(8)