https://community.extremenetworks.com/t5/data-center-vdx/duplicate-ip-arp-1038-error-in-vdx/m-p/6325#M217 This does not look like a VDX issue at all. This above looks like a DHCP server lease problem and/or duplicate DHCP servers, wrong DHCP relay or just duplicated IP configurations. Above you see an issue between a Macbook and a Lenovo laptop. Thu, 08 Mar 2018 04:26:00 GMT JoergKo 2018-03-08T04:26:00Z https://community.extremenetworks.com/t5/data-center-vdx/duplicate-ip-arp-1038-error-in-vdx/m-p/6324#M216 Hello!<BR /> <BR /> I have many ARP-1038 error on VDX6740 comming from our Aruba Controller. I noticed that errors appears at the end of DHCP lease time and it's not for all IP.<BR /> <BR /> <BR /> <BR /> it's a lot of errors like that:<BR /> <BR /> 2018/03/07-06:09:45, [ARP-1038], 78455, SW/0 | Active | DCE, WARNING, VDX6740-1, Duplicate IP 172.16.32.82 detected. New MAC-Address 5cf5.da95.6ce3, Old MAC-Address 8410.0d9a.aef9.<BR /> <BR /> <BR /> <BR /> Is anyone could help me?<BR /> <BR /> <BR /> <BR /> Thanks<BR /> <BR /> <BR /> Wed, 07 Mar 2018 22:03:00 GMT https://community.extremenetworks.com/t5/data-center-vdx/duplicate-ip-arp-1038-error-in-vdx/m-p/6324#M216 Al_Mat 2018-03-07T22:03:00Z https://community.extremenetworks.com/t5/data-center-vdx/duplicate-ip-arp-1038-error-in-vdx/m-p/6325#M217 This does not look like a VDX issue at all. This above looks like a DHCP server lease problem and/or duplicate DHCP servers, wrong DHCP relay or just duplicated IP configurations. Above you see an issue between a Macbook and a Lenovo laptop. Thu, 08 Mar 2018 04:26:00 GMT https://community.extremenetworks.com/t5/data-center-vdx/duplicate-ip-arp-1038-error-in-vdx/m-p/6325#M217 JoergKo 2018-03-08T04:26:00Z