wifi extender with gateway security

Hi,

I am able to access the internet through my wifi range extender when the gateway security is turned off.

When I turn on the gateway security, then I am not able to connect to the internet through the range extender, but only when using the gateway directly. 

Here are the details:

The range extender is: AC750 WiFi Range Extender (EX3110), https://www.netgear.com/support/product/EX3110

The gateway is: N300 Wi-Fi DOCSIS 3.0 Cable Modem Router (C3000), https://www.netgear.com/support/product/C3000

I always enable the gateway security for the gateway wifi network, and everything works just fine when I connect directly to the gateway wifi. I am able to configure the access lists to make it work. The problem is only when I am connected to the extender wifi network. Then the gateway security does not allow me to access the internet. I have to turn security off to access the internet from the extender, but that is not what I want.

Here are the configuration details, and note that devices connect with the actual mac address, not a randomly generated one.

This is the wifi extender connected devices view:

Note the two virtual mac addresses of the extender NETGEAR63_2GEXT network: 96:A6:7E:06:C8:9D, 02:0F:B5:36:C8:9D, and it's IP 192.168.0.28.

The other extender network NETGEAR63_5GEXT is not used.

The gateway security is configured this way.

Access control:

Note that both K51 and EX3110 are allowed and appear with the correct IP and mac address.

This is the wireless card access control list:

Note again all mac addresses are listed.

Any ideas?

Thanks...