08-20-2012 12:27 AM - edited 03-07-2019 08:25 AM
Hi!
When a user try to reconnect a PC appears this problem:
The system detected an address conflict for IP address 10.16.210.100 with
the system having network hardware address 2C-54-2D-EE-CF-C6. Network
operations on this system may be disrupted as a result.
This IP is an static binding configured on the DHCP server and the MAC that appear is so similar to the Cisco Switch that it's the gateway.
Connection
Physical Address. . . . . . . . . : F0-DE-F1-72-B4-17
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.16.210.100(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.254.0
Lease Obtained. . . . . . . . . . : viernes, 10 de agosto de 2012
10:10:07
Lease Expires . . . . . . . . . . : jueves, 16 de agosto de 2012
19:05:13
Default Gateway . . . . . . . . . : 10.16.210.1
DHCP Server . . . . . . . . . . . : 10.16.10.199
Interface: 10.16.210.100 --- 0x14
Internet Address Physical Address Type
10.16.210.1 2c-54-2d-ee-cf-c7 dynamic
10.16.211.255 ff-ff-ff-ff-ff-ff static
We are using dot1x on the switch access interfaces.
After one minute, it's work well.
We checked the DHCP server and the configuration is Ok.
Any idea about how does it solve?
Thanks,
02-08-2013 04:12 AM
Did u manage to solve the problem? find out what was causing it?
I have similar situation on one environment, but with the difference that I've got DAI enabled in the first place. After enabling 8021x we started to see IP conflict popup and DAI log that sth is wrong.
I was suspecting that Conflict Detection mechanizm in DHCP (on the client side) has sth to do with that but it shouldn't impact DAI. what is more it wasn't seen before we enabled 802.1x
regards
02-11-2013 04:45 AM
I've found interesting explanation:
https://supportforums.cisco.com/thread/2174476
http://networkingblog.vvlabs.com/2012/07/cisco-ise-duplicate-ip-address-windows-7.html
regards
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