Allied Telesis AT-WA7500 - Manual (Page 82)

3 - Configuring the Ethernet Network
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Set the second filter expression as shown below.
Table 15 Example 2 - Second Filter Expression
Parameter Value Explanation
ExprSeq 2 The second expression that is executed.
Offset 12 Checks for the DIX IP frame type, which starts 12 bytes from the
destination address.
Mask ff ff Checks the 2-byte DIX IP frame type for an exact match.
Op EQ Compares the value after the offset and mask are applied to the
value of the Value ID from the Filter Values menu to see if they are
equal. (If the value at the offset equals the specified value on the
Filter Values menu, the frame is DIX IP.)
Value ID 1 This filter expression applies to value ID 1 from the Filter Values
menu.
Action And If this filter expression is true, continue to the next expression.