Anyone Have any idea where those addresses come ??

RouterOS General
1

Hello i have configured my Hotspot pool 172.16.0.0/16

But in Hosts i see some addresse and i don’t know where they come from

anyone have any idea ??

thanks a lot

2

Possibly a second DHCP Server on your network? I use DHCP Rogue Detector to find DHCP servers on the network.
http://myitforum.com/myitforumwp/2014/10/29/rogue-dhcp-server-detection-free-tool/

Then I use Wireshark’s OUI lookup to map a MAC to manufacturer of a device, so you know what you’re looking for.
https://www.wireshark.org/tools/oui-lookup.html

3

routeros has a detector of rogue dhcp servers

http://wiki.mikrotik.com/wiki/Manual:IP/DHCP_Server#Alerts

4

Those are most likely clients that have static IPs set in their network adapter. When you set a address pool under IP>Hotspot>Server, the hotspot will use the pool to create a one to one NAT to allow clients with static IPs to be able to connect to the hotspot.

The hotspot sometimes detects old IPs a client might have had from a previous connection to another device before the client updated it’s DHCP information for the current connection. Your first two examples in the screenshot show this. There are two entries using the same MAC, the odd IP would be the Ip the client had from a previous connection. The second will be from after the client has updated it’s IP with your DHCP server.

You can disable this feature by setting IP>HotSpot>Server>address-pool=none. Your clients will still receive an address from the IP>DHCP-Server>address-pool.