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

Registered User

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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mac_none

MAC_NONE(4)						   BSD Kernel Interfaces Manual 					       MAC_NONE(4)

NAME

     mac_none -- null MAC policy module

SYNOPSIS

     To compile the null policy into your kernel, place the following lines in your kernel configuration file:

	   options MAC
	   options MAC_NONE

     Alternately, to load the sample module at boot time, place the following line in your kernel configuration file:

	   options MAC

     and in loader.conf(5):

	   mac_none_load="YES"

DESCRIPTION

     The mac_none policy module implements a sample MAC policy that has no effect on access control in the system.  Unlike mac_stub(4), none of
     the MAC entry points are defined.

   Label Format
     No labels are defined for mac_none.

SEE ALSO

     mac(4), mac_biba(4), mac_bsdextended(4), mac_ifoff(4), mac_lomac(4), mac_mls(4), mac_partition(4), mac_portacl(4), mac_seeotheruids(4),
     mac_stub(4), mac_test(4), mac(9)

HISTORY

     The mac_none policy module first appeared in FreeBSD 5.0 and was developed by the TrustedBSD Project.

AUTHORS

     This software was contributed to the FreeBSD Project by Network Associates Labs, the Security Research Division of Network Associates Inc.
     under DARPA/SPAWAR contract N66001-01-C-8035 (``CBOSS''), as part of the DARPA CHATS research program.

BUGS

     See mac(9) concerning appropriateness for production use.	The TrustedBSD MAC Framework is considered experimental in FreeBSD.

     While the MAC Framework design is intended to support the containment of the root user, not all attack channels are currently protected by
     entry point checks.  As such, MAC Framework policies should not be relied on, in isolation, to protect against a malicious privileged user.

BSD
								 December 1, 2002							       BSD