Filtering a mac address in the presence of a wifi extender

Hi,

I have a small home-made wifi router (i.e., an old PC) that is connected to the internet and gives wifi to my house. It runs Debian stable, and uses a dhcp server + the hotspotd.

In the dhcp server configuration I've hard-coded some devices according to their mac address to get fixed IP addresses. For example:

------- /etc/dhcp/dhcpd.conf ----------

...
host krembo {
hardware ethernet XX:XX:XX:XX:XX:XX
fixed-address 10.1.1.XX;
}
...
----------------------------------------

So far, it worked perfectly.

However, recently, I bought a small TP-Link wifi extender to improve the signal reception in my house. But for some reason, devices that are connected via the extender are not identified by their mac address, and as a result get a random IP address instead of the fixed one.

Is there any way I can fix that?

Thanks!
I.