(Error) Duplicate IP address found in net

[wpdavids]

Help.. I have a HACMP cluster configured with 2 servers. One server keeps filling the error log with "DUPLICATE IP ADDRESS DETECTED IN THE NET" . I have asked the network group to find the duplicate address, but they come up with no conflicing ip address found.

Why is this server picking up duplicate IP address conflicts ?

Is this a server problem or a problem with the HACMP cluster ?

Detail Error Below:
# errpt -a | pg
---------------------------------------------------------------------------
LABEL: AIXIF_ARP_DUP_ADDR
IDENTIFIER: FE2DEE00

Date/Time: Wed Mar 6 16:38:18
Sequence Number: 1200329
Machine Id: 000052694C00
Node Id: epic_2
Class: S
Type: PERM
Resource Name: SYSXAIXIF

Description
DUPLICATE IP ADDRESS DETECTED IN THE NET

Failure Causes
ARP RESPONSE RECEIVED FOR MY IP ADDRESS

Recommended Actions
CONTACT NETWORK ADMINISTRATOR

Detail Data
DUPLICATE IP ADDRESS
AC19 0A26
MAC ADDRESS
0006 29B9 211D
---------------------------------------------------------------------------

 

[Guest_imported]

wpdavids,

try to check each RS6K-AIX system by using:

# ifconfig <interface>, then enter

ifconfig en0

and u can also try this on other UNIX boxes.

if you're maintaining number of servers, woul-be nice if you have a documented list so you can update once u change any server's IP.

 

[MoshiachNow]

Hi,

I was investigating this some time ago.

This is what I got form IBM:
&quot;Answer to you question why you get errors in errpt log about double ip address.
Is becouse of gratuitous arp that AIX 4.3.3 supports (gratuitous arp check for duplicate ip).
There is no way to stop this.

For now you can try this i hope it will resolve you problem .
1. rmdev -dl (name of problematic adapter)
2. cfgmgr
3. lsdev -Cc to see if he available again
4. smitty tcpip -> minimum configuration&quot; &quot;Long live king Moshiach !&quot;

 

[wpdavids]

Thanks for all you replies and help I used your suggestions to solve this problem. The system I was working with is a HACMP cluster and the IP conflict was internal to the cluster. Meaning, the 1st network card had the same address as the 2nd network card in the same system.

I ran &quot;ifconfig -a &quot; and was able to see the conflict. I changed the conflicting adapter to the correct IP address and rebooted the system.

We will be doing HACMP test later.