Thanks for the responses.
Please see my answers to your questions:
1) What I want is to locate exactly where the psuedo IF and get rid of
it. Is there a way to prohibit the pseduo IF not to get DHCP answer?
2) Output of Ifconfig -a:
##########################################
eth0 Link encap:Ethernet HWaddr E4:1F:13:77:16:5F
inet addr:10.1.10.10 Bcast:10.1.10.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7818 errors:0 dropped:0 overruns:0 frame:0
TX packets:7762 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:841003 (821.2 KiB) TX bytes:1095188 (1.0 MiB)
Interrupt:169 Memory:e8100000-e8110000
eth1 Link encap:Ethernet HWaddr E4:1F:13:77:16:60
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:50 Memory:e8200000-e8210000
eth2 Link encap:Ethernet HWaddr 00:15:17:EB:AE:A4
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Memory:e8020000-e8040000
eth3 Link encap:Ethernet HWaddr 00:15:17:EB:AE:A5
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Memory:e8060000-e8080000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:11040 errors:0 dropped:0 overruns:0 frame:0
TX packets:11040 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2731896 (2.6 MiB) TX bytes:2731896 (2.6 MiB)
###########################################
Output on Switch:
######################################################
SW#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.1.10.1 - 0022.0c4d.c141 ARPA Vlan10
Internet 10.1.10.3 5 e41f.1377.1661 ARPA Vlan10
>>>>Psuedo Interface off Eth0
Internet 10.1.10.10 5 e41f.1377.165f ARPA Vlan10
SW#sh ip dhcp binding
IP address Client-ID/ Lease expiration Type
Hardware address
10.1.10.3 e41f.1377.1661 Mar 06 1993 10:22 AM
Automatic >>>>Psuedo Interface acquiring DHCP IP Address
10.1.30.57 0100.2713.6521.9c Mar 06 1993 10:03 AM Automatic
SW#ping 10.1.10.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.10.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 33/37/51 ms
SW#ping 10.1.10.10
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.10.10, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms
######################################################
3) No Virtual machine is running on this box.
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?
dmesg output: (showing only eth0/eth1/eth2 output)
#########################################################################
EDAC MC: Ver: 2.0.1 Apr 2 2010
EDAC MC0: Giving out device to i3200_edac i3200: DEV 0000:00:00.0
e1000e: Intel(R) PRO/1000 Network Driver - 1.0.2-k3
e1000e: Copyright (c) 1999-2008 Intel Corporation.
ACPI: PCI Interrupt 0000:04:00.0[A] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:04:00.0 to 64
eth0: (PCI Express:2.5GB/s:Width x4) 00:15:17:eb:ae:a4
eth0: Intel(R) PRO/1000 Network Connection
eth0: MAC: 0, PHY: 4, PBA No: d56146-003
ACPI: PCI Interrupt 0000:04:00.1[B] -> GSI 17 (level, low) -> IRQ 209
PCI: Setting latency timer of device 0000:04:00.1 to 64
sd 0:0:0:0: Attached scsi generic sg0 type 0
sd 1:0:0:0: Attached scsi generic sg1 type 0
scsi 2:0:0:0: Attached scsi generic sg2 type 5
eth1: (PCI Express:2.5GB/s:Width x4) 00:15:17:eb:ae:a5
eth1: Intel(R) PRO/1000 Network Connection
eth1: MAC: 0, PHY: 4, PBA No: d56146-003
tg3.c:v3.106 (January 12, 2010)
PCI: Enabling device 0000:00:1f.3 (0141 -> 0143)
ACPI: PCI Interrupt 0000:00:1f.3[B] -> GSI 17 (level, low) -> IRQ 209
ACPI: PCI Interrupt 0000:02:00.0[A] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:02:00.0 to 64
eth2: Tigon3 [partno(BCM95722) rev a200 PHY(5722/5756)] (PCI Express)
10/100/1000Base-T Ethernet e4:1f:13:77:16:5f
eth2: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[1] WireSpeed[1] TSOcap[1]
eth2: dma_rwctrl[76180000] dma_mask[64-bit]
ACPI: PCI Interrupt 0000:03:01.0[A] -> GSI 21 (level, low) -> IRQ 50
eth1: Tigon3 [partno(BCM95703A30) rev 1100 PHY(5703)]
(PCI:33MHz:32-bit) 10/100/1000Base-T Ethernet e4:1f:13:77:16:60
eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] WireSpeed[1] TSOcap[1]
eth1: dma_rwctrl[763f0000] dma_mask[64-bit]
sr0: scsi3-mmc drive: 24x/24x writer cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.20
#########################################################################
Regards, Sri
On Wed, Apr 11, 2012 at 4:05 PM, sri <bskmohan at gmail.com> wrote:
> Group,
>
> My linux box, running with Centos-5.5, is showing up (??) a pseudo
> network interface for Eth0.
> On Switch where my Eth0 is connected, observed 2 MAC-Addresses.
> If a DHCP server present in LAN, the second pseudo interface is
> picking up a DHCP IP Address too.
> Furthermore you can ping both Eth0 ip and Psedo Eth0 IP from the switch.
> The intensity of the problem is more when port-security is configured
> on SW for that port.
>
> “ifconfig –a” is not showing that pseudo interface.
> From dmesg output, no new things observed related while detecting the
> eth0 NIC during bootup.
> Only proof for this pseudo inerface’s mac address is SW showing it (on
> the SW port connected to my box eth0) in “show mac address-table”
> output
>
> Is there anything that I have to check to nail down the issue.
>
> Any pointers are highly appreciated.
>
>
> --
> --
> Krishna Mohan B
--
--
Krishna Mohan B