Allied Telesis x900-24 series manual 128, 256, 512, 024, 048, 096, 192, 16,384, 32,768, 65,536

Appendix A: How to use the layer 4 mask in classifiers

So our biggest block fits into the range 512-767.

The next second biggest block is 128 in our example … it should fit into 384-511.

...
256	- 383

384- 511

...

...

With these 2 blocks, we cover from 384-767. If we keep repeating the same procedure for the other blocks, we get the commands in the following table. In some of the cases, the blocks need to be divided into smaller blocks. In our example, instead of having a single block of 4, we used 2 x 2 blocks: one at the start (classifier 2) and one at the end (classifier 8).

Port range		Number of ports	Command
333		1	create class=1 udpdport=333
334-335		2	create class=2 udpdport=334 l4dmask=FFFE
336-351		16	create class=3 udpdport=336 l4dmask=FFF0
352-383		32	create class=4 udpdport=352 l4dmask=FFE0
384-511		128	create class=5 udpdport=384 l4dmask=FF80
512-767		256	create class=6 udpdport=512 l4dmask=FF00
768-775		8	create class=7 udpdport=768 l4dmask=FFF8
776-777		2	create class=8 udpdport=776 l4dmask=FFFE
L4 Mask	Number of ports
FFFF	1
FFFE	2
FFFC	4
FFF8	8
FFF0	16
FFEO	32
FFCO	64
FF80	128
FF00	256
FE00	512
FC00	1,024
F800	2,048
F000	4,096
E000	8,192
C000	16,384
8000	32,768
0000	65,536

Page 16 AlliedWare™ OS How To Note: Hardware Filters