changing the MAC

I hope I posted to the correct NGs

I lived in an apartment block where Internet access is provided via LAN.
Of late, I cannot access the Internet and was told to try and change my MAC for
my adapter and it works.

The management of the block suspects that one tenant is blocking access to the
Internet using MAC filters but unable to find out who;

Questions that I have are;

1. I thought only the management could block access using MAC filters on the
routers ?

2. Any applications that can detect who is blocking of MAC address ?

--
Dual Boot WinXP Pro SP3 with Windows 7