Vigor AP 800 Questions

Hi all

Anyone using the Vigor AP800?

I am looking at the MAC Address filtering, for one thing, and I am not
clear on what the options mean.
The default policy which is currently applied is "disable" i. e. the MAC
Address filtering is not operational.
The second option is "Activate MAC Address filter" and the third
"Blocked MAC Address filter".

Now I can guess what these two options will achieve, but as this is a
live corporate router I'd rather ask the question. Can anyone explain
how these two selections will operate please (the user manual is hopeless)?

Also, there is a list of attached devices under "Diagnostics" - "DHCP
Table". Is there any way to remove items from this list, or re-create
the list so as to lose old devices that haven't been attached for years?
There is a refresh option, but this doesn't seem to purge old
unconnected items.

Thanks

Phil