How To Block MAC adress???

Dear Admin & Friends
hello
kindly tell me how to block a MAC address in Mikrotik Router ???
thanx
waiting for ur positive response hardly
truly urs
SSG ONLINE

Block from what?

Maybe from connecting via wireless. If so, ACL can do it. If it’s to block a mac from transfering, you can use dhcp-reservation (static-dhcp) and block this IP address.

Like this?

/ip firewall filter
add action=drop chain=forward disabled=no src-address=10.0.0.0/8 src-mac-address=\
    00:00:00:00:00:00