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address conflict

anacucala
Level 1
Level 1

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,

2 Replies 2

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

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