I just discuss with Dlink support and here is the transcript:
Chat Transcript
18:49:12 [andre] hello,
18:49:20 [Jatin]
Thank you for contacting D-Link Technical Support, my name is Jatin, I will be assisting you today.
18:49:25 [Jatin] Hi Andre
18:50:08 [andre] Look at this thread, it could interesting for your team support.
18:50:14 [andre] wait
18:50:37 [andre] http://forums.dlink.com/index.php?topic=56386.new;topicseen#new.
18:50:38 [Jatin] May I know the issue you are facing with DAP-1320
18:50:51 [andre] My nick name is Guwrt
18:51:18 [andre] last post on the thread
18:51:35 [Jatin] Please give me one moment to look into this for you.
18:52:11 [andre] I try to solve this problem since several weeks and I have no solution for the moment
18:53:43 [andre] I thought it was my new router but using my old one didn't solve this issue
18:54:16 [Jatin] Please give me one moment to look into this for you.
18:54:55 [andre] That's why I am requesting a MAC filter on the DAP
18:55:52 [Jatin] Sorry Andre we dont have the MAC filtering feature on DAP-1320
18:57:26 [andre] I know that but how to solve this issue if there is not mac filter on dap?
18:58:03 [Jatin] On DAp-1320 we dont have any such provision
18:59:02 [andre] So, any suggestion?
18:59:21 [Jatin] Please check with router support if they could do anything
19:01:12 [andre] I am discussing with the Asus support to get help but you must consider the problem is present on both routers
19:01:28 [Jatin] ok
19:01:47 [Jatin] As of now we dont have any provision for MAC filtering on DAP
19:03:01 [andre] Any way to transfer this case to higher support team to help me?
19:03:11 [Jatin] sure
19:03:13 [Jatin] Thank you for contacting D-Link Technical Support. In order to further enhance your support experience in the future, please register your product at http://support.dlink.ca/register . Thank you for chatting with us and have a great evening.
SO... not very much support from them
This thread is interesting to http://forums.dlink.com/index.php?topic=56258.0
I hope I will have more succes with Asus support
Andre