Hi John, Thanks for the explanation. I looked at the BIOS and found the following where the pseudo MAC address is from: ################################################################################ Planar Ether 1 MAC Address: E4:1F:13:77:16:5F ============> This is shown in ifconfig eth0 Planar Ether 2 MAC Address: E4:1F:13:77:16:60 ============> This is shown in ifconfig eth1 BMC MAC Address: E4:1F:13:77:16:61 ======> This is the MAC address my SW is showing on the SW port connected to my eth0 Slot 1 MAC Address: 00:15:17:EB:AE:A4 ===========> This is shown in ifconfig eth2 ######################################################## I got some pointers over web on how to disable the BMC so that it would not use eth0. But another question in my mind is what is the significance of BMC MAC address here? (How different is it from the MAC addresses of other conneted NIC cards and how OS uses it)? And why not BIOS shows all the NIC devices detected ? (because "ifconfig -a" shows eth0/eth1/eth2/eth3 for me with eth3 MAC is: 00:15:17:EB:AE:A5. I could not see eth3 MAC address in the above BIOS output). Thanks for your time. Regards, Sri On Thu, Apr 12, 2012 at 1:18 AM, John R Pierce <pierce at hogranch.com> wrote: > On 04/11/12 9:36 AM, sri wrote: >> 4) Have you checked if your motherboard IPMI is not pulling an address >> during boot? >> -- Frankly, not sure how to check motherboard IPMI messages. Verified >> dmesg output. Following is the dmesg output. >> Please share any way to check motherboard IPMI is pulling another address? > > well, first, does your motherboard *HAVE* an IPMI management module, and > if so, does it use a dedicated ethernet port, or is it 'piggybacked' on > eth0 ? the behavior shown could be the latter. > > I'd look in the system or motherboard documentation for this... > depending on the IPMI module, it may have a web or ssh interface, or it > may require another system contact it via an 'ipmitool' of some sort. > It probably has an initial user/pass like admin/admin which should be > reconfigured during system configuration and deployment. > > -- > john r pierce N 37, W 122 > santa cruz ca mid-left coast > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos -- -- Krishna Mohan B