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890-007 Rev. A 01/28/99 Page 59 © 1999 RadioLAN, Inc.
Mask Bytes
As an alternative to placing wildcards (00) in the MAC Address
field, the Mask Bytes column allows you to select which octets
in the MAC Address field will be read by the CPU (see
Figure 37).
Entering ff into a mask bytes octet instructs the CPU to allow
only MAC octets with a value matching the same location in
the MAC Address field to pass. The CPU rejects any other
entry in the octet position.
Entering a 00 into a mask bytes octet instructs the CPU to
“mask” the octet. When the octet is masked, the CPU allows
any entry to pass.
Entering an ff into a mask bytes octet, and a 00 in the same octet position of the MAC Address instructs the CPU
to allow an entry matching only 00 to pass.
Source/Dest.
The Source/Dest. column allows you to specify whether the action upon packets will occur if that node is sending or
receiving packets.
MAC Address: 00 A0 D4 00 00 00
ff ff ff 00 00 00Mask Bytes:
1 2 3 4 5 6Byte Position:
ff = the byte in this position must match
00 = allow any digit in this section
Assigned to a
Manufacturer
Assigned by a
Manufacturer
Figure 37: Working with Mask Bytes