URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
On 11.4.2012 12:35, sri wrote:
...
> 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.
Show us the output of ifconfig -a
--
Kind Regards, Markus Falb
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04-11-2012, 12:43 PM
Markus Falb
URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
On 11.4.2012 12:35, sri 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.
A running virtual machine which virtual interface is bridged to eth0 ?
--
Kind Regards, Markus Falb
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04-11-2012, 01:21 PM
yonatan pingle
URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
Have you checked if your motherboard IPMI is not pulling an address during boot?
On Wed, Apr 11, 2012 at 3:28 PM, Markus Falb <markus.falb@fasel.at> wrote:
> On 11.4.2012 12:35, sri wrote:
> ...
>> 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.
>
> Show us the output of ifconfig -a
> --
> Kind Regards, Markus Falb
>
>
> _______________________________________________
> CentOS mailing list
> CentOS@centos.org
> http://lists.centos.org/mailman/listinfo/centos
>
--
Best Regards,
Yonatan Pingle
RHCT | RHCSA | CCNA1
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04-11-2012, 04:36 PM
sri
URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
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
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?
On Wed, Apr 11, 2012 at 4:05 PM, sri <bskmohan@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
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04-11-2012, 07:48 PM
John R Pierce
URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
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
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04-12-2012, 02:21 AM
Les Mikesell
URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
On Wed, Apr 11, 2012 at 2:48 PM, John R Pierce <pierce@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.
There might be an option in the bios setup to disable IPMI or give it
a static address.
And are you really sure it is from this machine? If you
disconnect/shut down, do both IP's stop responding? If you can't
trace the wiring from the switch port you are checking to the host,
maybe there is an intermediate switch/hub with some other device.
--
Les Mikesell
lesmikesell@gmail.com
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04-12-2012, 07:04 AM
Markus Falb
URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
On 12.4.2012 04:21, Les Mikesell wrote:
> On Wed, Apr 11, 2012 at 2:48 PM, John R Pierce <pierce-BRp9yk6zKL1Wk0Htik3J/w@public.gmane.org> wrote:
...
>> 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.
...
> And are you really sure it is from this machine?
Have a look at the MAC addresses
eth1: E4:1F:13:77:16:60
"pseudo interface": E4:1F:13:77:16:61
--
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04-12-2012, 12:59 PM
Les Mikesell
URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
On Thu, Apr 12, 2012 at 2:04 AM, Markus Falb <markus.falb@fasel.at> wrote:
> On 12.4.2012 04:21, Les Mikesell wrote:
>> On Wed, Apr 11, 2012 at 2:48 PM, John R Pierce <pierce-BRp9yk6zKL1Wk0Htik3J/w@public.gmane.org> wrote:
> ...
>>> 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.
> ...
>> And are you really sure it is from this machine?
>
> Have a look at the MAC addresses
> eth1: E4:1F:13:77:16:60
> "pseudo interface": E4:1F:13:77:16:61
Good point. That also identifies the devices as an IBM, making this
easier to find:
http://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5071483
The quick fix might be to just not use the onboard ethernet1 port
since it looks like there are others that are unused.
--
Les Mikesell
lesmikesell@gmail.com
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URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
