D-Link DGS-3120-24TC Product Manual page 325

xStack® DGS-3120 Series Managed Switch Web UI Reference Guide
Offset Offset Offset Offset
Chunk Chunk0 Chunk1 Chunk2
127 3 7
Byte
Byte
128 4 8
Byte
1 5 9
Byte
2 6 10
Offset Offset Offset Offset
Chunk Chunk16 Chunk17 Chunk18
Byte
63 67 71
Byte
64 68 72
Byte
65 69 73
Byte
66 70 74
The following table indicates a completed ARP packet contained in Ethernet frame which is the pattern for the
calculation of packet offset.
Command
Step 1: create access_profile_id 1
profile_name 1 ethernet source_mac
FF-FF-FF-FF-FF-FF ethernet_type
Step 2: config access_profile profile_id 1
add access_id 1 ethernet source_mac
01-02-03-04-05-06 ethernet_type
0x806 port 1-12 permit
Step 3: create access_profile profile_id 2
profile_name 2 packet_content_mask
offset_chunk_1 3 0xFFFF
offset_chunk_2 7 0xFFFF
offset_chunk_3 8 0xFFFF0000
Step 4: config access_profile profile_id 2
add access_id 1 packet_content
offset_chunk_1 0x806 offset_chunk_2
Offset Offset Offset Offset
Chunk3 Chunk4 Chunk5 Chunk6
11 15 19 23
12 16 20 24
13 17 21 25
14 18 22 26
Offset Offset Offset Offset
Chunk19 Chunk20 Chunk21 Chunk22
75 79 83 87
76 80 84 88
77 81 85 89
78 82 86 90
Table 6. Chunk and Packet Offset
Table 5 A Completed ARP Packet Contained in an Ethernet Frame
Offset Offset Offset Offset
Chunk7 Chunk8 Chunk9 Chunk10
27 31 35 39
28 32 36 40
29 33 37 41
30 34 38 42
Offset Offset Offset
Chunk23 Chunk24 Chunk25 Chunk26
91 95 99
92 96 100
93 97 101
94 98 102
Description
Create access profile 1 to match Ethernet Type and
Source MAC address.
Configure access profile 1
Only if the gateway's ARP packet that contains the
correct Source MAC in the Ethernet frame can pass
through the switch.
Create access profile 2
The first chunk starts from Chunk 3 mask for
Ethernet Type. (Blue in Table 6, 13th and 14th
bytes)
The second chunk starts from Chunk 7 mask for
Sender IP in ARP packet. (Green in Table 6, 29th
and 30th bytes)
The third chunk starts from Chunk 8 mask for
Sender IP in ARP packet. (Brown in Table 6, 31st
and 32nd bytes)
Configure access profile 2.
The rest of the ARP packets whose Sender IP claim
they are the gateway's IP will be dropped.
317
Offset Offset Offset
Chunk11 Chunk12 Chunk13
43 47 51
44 48 52
45 49 53
46 50 54
Offset Offset Offset Offset
Chunk27 Chunk28 Chunk29
103 107 111 115
104 108 112 116
105 109 113 117
106 110 114 118
Offset Offset
Chunk14 Chunk15
55 59
56 60
57 61
58 62
Offset Offset
Chunk30 Chunk31
119 123
120 124
121 125
122 126