Linux – MAC address filtering in Linux

You might want to see Filters Using MAC-Based ACLs.

Can you provide details about the hardware / software you're running?

Update:

So based on the information you supplied I believe this is the correct answer. From the linked document above:

AP# configure terminal
AP<config># access-list 700 deny 0040.96a5.b5d4 0000.0000.0000

!--- This ACL denies all traffic to and from 
!--- the client with MAC address 0040.96a5.b5d4.

AP<config># interface Dot11Radio0.1


!--- Or whatever the radio interface is

AP<config># dot11 association mac-list 700

Personally, my favorite (requires bash and other things that are standard on most Linux distributions)

The details can depend a lot on what the two things output and how you want to merge them ...

Contents of command1 and command2 after each other in the output:

cat <(command1) <(command2) > outputfile

Or if both commands output alternate versions of the same data that you want to see side-by side (I've used this with snmpwalk; numbers on one side and MIB names on the other):

paste <(command1) <(command2) > outputfile

Or if you want to compare the output of two similar commands (say a find on two different directories)

diff <(command1) <(command2) > outputfile

Or if they're ordered outputs of some sort, merge them:

sort -m <(command1) <(command2) > outputfile

Or run both commands at once (could scramble things a bit, though):

cat <(command1 & command2) > outputfile

The <() operator sets up a named pipe (or /dev/fd) for each command, piping the output of that command into the named pipe (or /dev/fd filehandle reference) and passes the name on the commandline. There's an equivalent with >(). You could do: command0 | tee >(command1) >(command2) >(command3) | command4 to simultaneously send the output of one command to 4 other commands, for instance.