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

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