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Req : How to control Proxy users MAC on Cisco 3560

          Dear Experts,

We are provide Internet to our customers via broadband to their PC or ADSL Router , but since couple of days we are observing some customers are miss used our internet they are provide to others via Proxy or DHCP in ADSL router.

1st diagram :

Our 3560 Switch port 5 >>>>DSLAM>>>ADSL Modem (CPE)via dhcp and NAT >>>unmanaged switch (CPE)>>> their unknown users PCs.

Req : in this case we require deny MAC their unknown users pc in our Cisco 3560 Switch.

2nd Diagram:

Our 3560 Switch port 6 >>> connect cable to Cus PC LAN Card

In this case they are using 2 LAN card their internet PC one for sharing internet via proxy and 2nd LAN for their LAN users to using their unknown users.

Req : how to control their unknown users PC's MAC in our 3560 Switch.

Please help me i realy need to block their proxy users internet.

Thanks in ADV,

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