Preferred - Duplicate IP Address

I have a few computers, Win 7 and static IP Address, that suddenly are having problems. it looks like IP Address is being used somewhere else, but all involved in tech support deny this. The computer show that they now have a preferred IP Address while the
original (static one) is shown as duplicate.
Never saw this before, does that really mean that the original address is being used somewhere else?
Is there a way to trace "the guilty" computer?
Thanks for all your help.

Hi,
This error message indicates that another computer on the network is using the same IP address that your computer is using. Each computer on a network must have a unique IP address. To fix this problem, run the Network troubleshooter.
Open the Network troubleshooter by right-clicking the network icon in the notification area, and then clicking Troubleshoot problems.
If the issue happend when the computer is put into sleep mode and then turned on while connected to another network that uses the same IP address. It is better to try and use a different one in the same subnet. One way to check to make sure the one you are
picking is not already being used is to simple ping the IP addresss (ping x.x.x.x).
In some rare instances, the actual DHCP server can malfunction and assign more than one computer the same IP. In this case, it is best to try and update the firmware on your router.
Kate Li
TechNet Community Support

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welcome to the SDN CRM Development forum.
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TS1398 I used to be able to connect to this wifi. Now I am unable to do so because there is a duplicate IP address. This is there error it gives me. I tried everything in this article but nothing works. please help.

Everytime I try to connect, it gives me a message which reads http://www.apple.com Duplicate IP address: you must login with a different IP address". Help!

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How do I move/copy contacts from Entourage to iCloud Address Book without creating duplicates? Address Book on Mac, iCloud, iPhone and iPad is now empty

How do I move/copy contacts from Entourage to iCloud Address Book without creating duplicates? Address Book on Mac, iCloud, iPhone and iPad is now empty

Thank you for letting me know!
Going to give it a go. Had a back up of all my clients files stupidly not my software as I have the originals disks. Just realised that amongst the software is ibiz and have lost al my accounting and billing files for the last 7 years want to cry so losing my contacts now will really tip me over the edge!
Fingerscrossed this works!

Duplicate IP address using Mirrored switch ports

Hi All,
Here's a good one. We use Websence and have an agent installed on one of our T1 Netras in a routed subnet. To collect info from all the traffic in that subnet we mirrored the uplink port to the gateway. Thus all traffic on that port is mirrored to the Solaris 10 box. Shortly after mirroring we started receiving duplicate ip address errors.
Hardware address '00:03:XX:XX:XX:XX' trying to be our address XXX.XXX.XXX.XXX.
With further investigation we discovered that when we ping a host that exists no error is generated. Pinging an ip that is not there produces the errors!
It seems that an ARP request that is not answered is being bounced back through the mirrored port. When the box sees this it thinks that another box is trying to send out the ARP broadcast.
With valid IP with snoop:
SUN01 -> 192.XXX.XXX.4 ICMP Echo request (ID: 615 Sequence number: 0)
192.XXX.XXX.4 -> (broadcast) ARP C Who is 192.XXX.XXX.10, SUN01 ?
SUN01 -> 192.XXX.XXX.4 ARP R 192.XXX.XXX.10, SUN01 is 0:3:ba:27:2e:9d
192.XXX.XXX.4 -> SUN01 ICMP Echo reply (ID: 615 Sequence number: 0)
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SUN01 -> (broadcast) ARP C Who is 192.XXX.XXX.2, 192.XXX.XXX.2 ?
SUN01 -> (broadcast) ARP C Who is 192.XXX.XXX.2, 192.XXX.XXX.2 ?
No i didn't copy and paste it twice!! :p
Since nothing responds the box assumes that the message came from someone else. Its like talking into a mirror thinking that the reflection is speaking for you so you stop and complain that his lips moved!!
When looking at the arp table we found only a hand full of entries. Since there are around a 10 nodes we should see more. We removed the publish flag for the host and the duplicate IP problem goes away. Fixed, sorta. when all the arp caches clear we might run into the issue of not being able to communicate with it.
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Any Help with this is appreciated.
thank you

Sorry been on vacation the last couple of weeks...
I created this little script to fix the problem
root@srelay01:/etc/rc2.d> more S05arpset
#!/bin/sh
arp -s srelay01 00:03:ba:27:2e:9d
if you find that you need to broadcast try using the -p switch with it on another box. The problem is gone and the system interacts on the network fine. I would still love to know why this happens.
Good luck!

WLC Duplicate IP address detected for AP-Manager Interface

I am getting an error log in the WLC saying, its IP address is duplicate by another machine with MAC address A.B.C.D
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Model No.                   AIR-WLC2106-K9
Software Version                 7.0.116.0
%LWAPP-3-DUP_IP: spam_lrad.c:27626 Adding client 58:b0:35:83:72:86 to exclusion list due to IP Address conflict with AP 'AP_DUXO_3'
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Cisco AP Identifier.............................. 1
Cisco AP Name.................................... AP_DUXO_3
Country code..................................... US - United States
Regulatory Domain allowed by Country............. 802.11bg:-A     802.11a:-A
AP Country code.................................. US - United States
AP Regulatory Domain............................. 802.11bg:-A    802.11a:-N
Switch Port Number .............................. 1
MAC Address...................................... cc:ef:48:1a:e4:af
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IP Address....................................... 10.184.1.224
IP NetMask....................................... 255.255.0.0
Gateway IP Addr.................................. 10.184.20.2
Domain...........................................
Name Server......................................
NAT External IP Address.......................... None
CAPWAP Path MTU.................................. 1485
Telnet State..................................... Enabled
Ssh State........................................ Disabled
Cisco AP Location................................ DUXO_BOX
Cisco AP Group Name.............................. default-group
Does anyone have an issue like this ?

Are you sure this MAC address 58:b0:35:83:72:86 isn't some type of Apple device? Its OUI is registered to apple. How do clients get ip addresses DHCP? It appears that the IP 10.184.1.224 is statically assigned to your ap-manager and that this client 58:b0:35:83:72:86 is either getting that same IP from DHCP or the client is statically assigning it themselves.

Can't remove duplicates in Address Book

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If you click on File, and choose New Group, does the same thing happen?
What keyboard and mouse are you using?
Ernie
Message was edited by: Ernie Stamper

How do i eliminate duplicates in address book/contacts across multiple devices?

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OS - Win7 Pro 32 bit

Duplicate IP address detected in WCS

Hi to Cisco Support Community,
I would like to verify some questions regarding our network setup for wireless devices.
We have here in our client a 5508 WLC version 6.0.196.0 and WCS version 7.0.164.0 using windows platform.
My concern is that there is always a duplicate IP address detected by the WCS and when we trace the machine given its MAC address, we found out that the machine is a printer with a static IP of different IP address not the same to the management IP address of the WLC.
I have already disabled the port where the machine detected is terminated and still experiencing the same issue.
Is this a software bug or some sort of network issue? Please advice.
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Joghson

Hi,
I have raised the issue with TAC and they told me that this is a software issue, we are currently making packet sniffs which is needed by the software developer. I will give you updates on this.
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Windows 7 / 2008 duplicate static address when using 802.1x / MAB - ISE

Hi all!
ISE 1.1.3
Cisco 3750 switches
Windows XP / 7 / 2008 clients
I'm having some weird issues were if a client connects to a switchport and happens to be using a static IP address then the client warns of a duplicate address problem. Also the client will then only show the default gateway within ipconfig even though the IP address / mask is still in the GUI network properties of the adaptor. This is happening with Windows 7 and Windows 2008 devices.
Windows XP clients don't get the issue.
Some clients will use 802.1x native supplicant and some will be authenticated based on MAB. Not noticed the problem with 802.1x clients but it always occurs on MAB.
I came across a similar issue here:
http://networkingblog.vvlabs.com/2012/07/cisco-ise-duplicate-ip-address-windows-7.html
Going of that blog I tried using the "ip device tracking delay probe delay" command but the switches don't recognise the "delay" keyword.
The switches are 3750 switches running version 12.2(58)SE2.
All I have is "count, interval, use-svi" as extra options.
Catalyst 4500 switch guide has "delay" option but no "count, interval or use-svi".
The only way I have managed to avoid the problem is using the second solution which is a registry hack on each client. This is fine for the odd server but not realistic when there will be hundreds of other clients.
Any ideas?

Hi
We are doing 802.1x for clients using the Windows supplicant. For clients not using supplicants we are using MAB. So the print servers and printers use MAB.
Extract of config...
aaa new-model
aaa authentication login default local
aaa authentication dot1x default group radius
aaa authorization network default group radius
aaa authorization auth-proxy default group radius
aaa accounting update periodic 5
aaa accounting dot1x default start-stop group radius
aaa accounting system default start-stop group radius
aaa server radius dynamic-author
client x server-key 7 x
client x server-key 7 x
aaa session-id common
clock summer-time BST recurring last Sun Mar 23:00 last Sun Oct 23:00
system mtu routing 1500
vtp mode transparent
authentication mac-move permit
ip routing
no ip domain-lookup
ip device tracking
dot1x system-auth-control
dot1x critical eapol
spanning-tree mode pvst
spanning-tree extend system-id
vlan internal allocation policy ascending
interface FastEthernet1/0/1
description ### Dot1x with MAB fallback ###
switchport mode access
switchport voice vlan 2
ip access-group ACL-DEFAULT in
srr-queue bandwidth share 10 10 60 20
priority-queue out
authentication event fail action next-method
authentication event server dead action authorize vlan 1
authentication event server alive action reinitialize
authentication host-mode multi-auth
authentication open
authentication order dot1x mab
authentication priority dot1x mab
authentication port-control auto
authentication periodic
authentication timer restart 0
authentication timer reauthenticate server
authentication violation restrict
mab
mls qos trust device cisco-phone
mls qos trust cos
auto qos voip cisco-phone
dot1x pae authenticator
dot1x timeout tx-period 5
spanning-tree portfast
service-policy input AutoQoS-Police-CiscoPhone
ip http server
ip http secure-server
ip access-list extended ACL-DEFAULT
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deny ip any 172.x.x.x 0.0.0.255 log
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permit ip any any
ip radius source-interface Vlan2
logging esm config
logging host x transport udp port 20514
logging host x transport udp port 20514
radius-server attribute 6 on-for-login-auth
radius-server attribute 8 include-in-access-req
radius-server attribute 25 access-request include
radius-server dead-criteria time 30 tries 3
radius-server vsa send accounting
radius-server vsa send authentication
radius server ISE-1
address ipv4 x auth-port 1645 acct-port 1646
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Hyper-V cluster validation report "Found duplicate physical address" on nic team interfaces.

I recently built a Windows 2012 Hyper-V cluster with 5 nodes. The validation report shows “duplicate physical address” error (error text pasted below).
The hardware: HP BladeSystem – servers are BL460c blades, in a c7000 enclosure, connected to HP Virtual Connect switches.
Each server has 2 physcal nics, teamed in Windows. In the NIC Teaming console, I created the following Team Interfaces and assigned each a VLAN ID:
“Team1” (the default team)
“Team1 - VLAN 204 – Management”
“Team1 - VLAN 212 - 2012HB”
“Team1 - VLAN 211 -Exchange DAG Replication”
I also created 2 HV Virtual Switches. Neither one allows management interface to share. They are assigned to “Team1” and “Team1 - VLAN 211 -Exchange DAG Replication” respectively.
Therefore, in Network Connection, I see the 2 physical Ethernet nics, and 4 “virtual” nics. Only 2 of them have IP addresses assigned: Management and HB. These are the two that the validation wizard complains
about.
The MAC address is not configurable in the NIC Teaming console, so I don’t see a way to resolve this error, except to use separate physical nics. I don’t want to do that because a) I would lose the benefits of
the bandwidth aggregation that Virtual Connect provides, and b) When creating an Interface on a Team in Windows, it looks like it ALWAYS gives it the same MAC address, so that should be a supported configuration.
Everything works just fine, and there are no other errors or IP conflicts or anything else. But I really want to fix it because I don’t know what unknown problems this may be causing.
From the Cluster Validation report:
Found duplicate physical address 10-60-4B-A9-4A-30 on node Cluster201.OurDomain.local adapter
Team1 - VLAN 212 - 2012HB and node Cluster201.OurDomain.local adapter
Team1 - VLAN 204 - Management.
Found duplicate physical address F0-92-1C-13-3C-2C on node Cluster202.OurDomain.local adapter
Team1 - VLAN 212 - 2012HB and node Cluster202.OurDomain.local adapter
Team1 - VLAN 204 - Management.
Found duplicate physical address 68-B5-99-C1-7E-9C on node Cluster210.OurDomain.local adapter
Team1 - VLAN 212 - 2012HB and node Cluster210.OurDomain.local adapter
Team1 - VLAN 204 - Management.
Found duplicate physical address 3C-4A-92-DE-1E-74 on node Cluster211.OurDomain.local adapter VC-Team - VLAN 212 - 2012HB and node Cluster211.OurDomain.local adapter
VC-Team - VLAN 204 - Management.
Found duplicate physical address 68-B5-99-C0-3D-50 on node Cluster212.OurDomain.local adapter
Team1 - VLAN 212 - 2012HB and node Cluster212.OurDomain.local adapter
Team1 - VLAN 204 - Management.
Thanks!
Dan

Hi Dan,
"It turns out that both hosts had the same default MAC address ranges for their virtual switches. Since the host vNICs were attached to the virtual switch on each host they received the first couple of MAC addresses from the switches.
For details please refer to following link:
http://www.jefflafr.com/blog/4/19/2013/conflicting-mac-addresses-when-building-a-hyper-v-cluster-with-converged-networking
Hope this helps
Best Regards
Elton Ji
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Duplicate IP address

I am getting a duplicate IP address error message in system.log quite often. I've pasted it below. This is occurring on multiple Macs at the office. The address that is in the message is the address of the computer itself. It doesn't matter if the network is configured DHCP or manual. Still get the same message, with different IP addresses being report of course. From another machine I can ping 10.1.3.1 and the correct Mac responds. I disconnect the network to 10.1.3.1 and ping and there is no response. The network never goes down, which does happen when you really have duplicate IPs on the network.
The switch that we are connecting to is a Cisco 6509 with VLANs on it. The VLANs are separate and don't interact. The net mask for the network is class A.
Everything I have search for on the net says "you have another computer with the same IP" but I KNOW that is not the case.
Anyone have any ideas?
12/9/09 8:35:13 AM kernel en0 duplicate IP address 10.1.3.1 sent from address 00:17:f2:01:ed:08
12/9/09 8:35:13 AM kernel en0 duplicate IP address 10.1.3.1 sent from address 00:17:f2:01:ed:08
12/9/09 8:35:13 AM kernel en0 duplicate IP address 10.1.3.1 sent from address 00:17:f2:01:ed:08
12/9/09 8:35:13 AM kernel en0 duplicate IP address 10.1.3.1 sent from address 00:17:f2:01:ed:08
12/9/09 8:35:13 AM kernel en0 duplicate IP address 10.1.3.1 sent from address 00:17:f2:01:ed:08

The MAC address in the error message is the MAC address of the machine reporting the error. Normally that MAC address in the error message is the other machine on the network that is trying to use the same IP address.
ifconfig en0
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::217:f2ff:fe01:ed08%en0 prefixlen 64 scopeid 0x4
inet 10.1.3.1 netmask 0xff000000 broadcast 10.255.255.255
ether 00:17:f2:01:ed:08
media: autoselect (1000baseT <full-duplex,flow-control>) status: active
supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full-duplex,hw-loopback> 1000baseT <full-duplex,flow-control>
Message was edited by: Alan Ordway
Message was edited by: Alan Ordway

Duplicate the Address book ?

How do I copy / duplicate my Address book that is on iCloud so I have a non cloud copy on my Mini or is there a method to sync both?
Cheers

If you are using Outlook 2011, make sure you have the latest service pack and update.
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WGM - Can't add computers due to duplicate MAC address

Hello all,
I'm having a problem with 10.5.4 Server where once a computer is deleted from WGM it can't be added back. WGM gives an error message about duplicate MAC addresses. It appears that, although the deleted computer is no longer listed, the MAC address and name seem to still either be cached or in the database.
Any ideas?
Thanks

Saw you have no replies yet... did you ever get this issue figured out?
It's a shot in the dark, but years back we used to get zombie Macs (er, MACs) that would not show up in the list of computers, but were "still in the system" as a damaged record. Try enabling the "All Records" tab from the WGM prefs and searching for the computer record there, within the "Computers" list. If you can find them, deleting them should allow you to add them back in normally.
Let us know. Cheers, Joel

Preferred - Duplicate IP Address

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