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Solve the Duplicate IP error in Cisco SG 500 switch


I am see the following error in the system log of my SG 500 Cisco switch:

%IPADTBL-N-IPDUPLICATE: Duplicate IP address from MAC 00:xx:xx:12:43:2e was detected on VLAN 200, port gi1/26, aggregated (4)


When this error occurs, the PC connected to the WiFi access point on Port 13 (access to VLAN 200) freezes, and it continues browsing after a while. I don't know what causes this error.

The 00:xx:xx:12:43:2e MAC address belongs to my router, and the IP is the IP of the VLAN 200, the IP of the VLAN interface created on the Router, the IP of the default gateway, DHCP and DNS. DHCP is done by the SG 500 which is set in Layer 3 mode, while the DNS is provided by the router.


Do you see any problem in my set up of DHCP pools (see attached pics)?

Maybe there is a problem with my VLAN setup? VLAN 200 is supposed to provide connectivity to guests through wifi AP connected at port 13 (access), VLAN 1 is the native VLAN. And port 26 is the uplink to router set in trunk mode.

Any suggestions?

  • Small Business Switches
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