- MIB ".1.3.6.1.2.1.17.4.3.1.1" をnet-snmpのsnmpwalkで取得すると右辺にスイッチが学習したMACアドレスを取得することができるが, スイッチが学習したアドレスの中には取得できないものがある.
- MACアドレスが全て"20"から"7e"までの間にある場合には, このアドレスはログインしてshow mac address-tableで表示させることはできても, "snmpwalk -c コミュニティ名 -v 1 スイッチ名 .1.3.6.1.2.1.17.4.3.1.1"では取得できない.
- 最上位は1ビット広がって,"19"から"7f"の範囲になる.
- 例："arping -0 -s 20:20:20:20:20:20 -p 適当なIPアドレス" としてソースMACアドレスを20:20:20:20:20:20にしたパケットを発信してみると, Ciscoスイッチはこのアドレスを学習していてもsnmpwalkには存在していない.
- 例："arping -0 -s 20:20:20:20:7f:20 -p 適当なIPアドレス" としてソースMACアドレスを20:20:20:20:7f:20にしたパケットを発信してみると, snmpwalkにも"Hex-STRING: 20 20 20 20 7F 20"という応答がある.
- net-snmpのバージョンにはよらない.
- IOSのバージョンにはよらない. さらに古いCatOSの一部でも同じ結果. かなり以前からこういう仕様になっているらしい?
- 該当する可能性があるハードウエアメーカー. Apple,Sonyの他,Ciscoも入っている.
- 各メーカーとも下三桁の((6*16-1)/256)^3=5.1%に該当の可能性がある.
20:41:5A Smarteh_d_o_o
20:44:3A Schneider_Electric_Asia_Pacific
20:4E:6B Axxana_israel_ltd
20:54:76 Sony_Mobile_Communications_AB
20:5B:2A PRIVATE
20:5B:5E Shenzhen_Wonhe_Technology_Co_Lt
20:64:32 SAMSUNG_ELECTRO_MECHANICS_CO_LT
24:37:4C Cisco_SPVTG
24:3C:20 Dynamode_Group
24:49:7B Innovative_Converged_Devices_In
24:69:4A Jasmine_Systems_Inc
24:76:7D Cisco_SPVTG
28:37:37 Apple_Inc
28:41:21 OptiSense_Network_LLC
28:48:46 GridCentric_Inc
28:4C:53 Intune_Networks
28:51:32 Shenzhen_Prayfly_Technology_Co_
28:60:46 Lantech_Communications_Global_I
2C:21:72 Juniper_Networks
2C:2D:48 bct_electronic_GesmbH
2C:30:68 Pantech_Co_Ltd
2C:34:27 ERCO_amp_GENER
2C:3A:28 Fagor_Electr_nica
2C:3F:38 Cisco_Systems
2C:3F:3E Alge_Timing_GmbH
2C:41:38 Hewlett_Packard_Company
2C:54:2D Cisco_Systems
2C:62:5A Finest_Security_Systems_Co_Ltd
30:38:55 Nokia_Corporation
30:39:26 Sony_Ericsson_Mobile_Communicat
30:39:55 Shenzhen_Jinhengjia_Electronic_
30:41:74 ALTEC_LANSING_LLC
30:49:3B Nanjing_Z_Com_Wireless_Co_Ltd
30:4C:7E Panasonic_Electric_Works_Automa
30:52:5A NST_Co_LTD
30:5D:38 Beissbarth
30:69:4B RIM
30:6E:5C Validus_Technologies
30:7C:30 RIM
34:25:5D Shenzhen_Loadcom_Technology_Co_
34:2F:6E Anywire_corporation
34:4B:3D Fiberhome_Telecommunication_Tec
34:4B:50 ZTE_Corporation
34:4F:69 EKINOPS_SAS
34:68:4A Teraworks_Co_Ltd
34:78:77 O_NET_Communications_Shenzhen_L
34:7E:39 Nokia_Danmark_A_S
38:60:77 PEGATRON_CORPORATION
38:6E:21 Wasion_Group_Ltd
3C:27:63 SLE_quality_engineering_GmbH_am
3C:2F:3A SFORZATO_Corp
3C:36:3D Nokia_Corporation
3C:3A:73 Avaya_Inc
3C:4C:69 Infinity_System_S_L
3C:4E:47 Etronic_A_S
3C:5A:37 Samsung_Electronics
3C:62:78 SHENZHEN_JETNET_TECHNOLOGY_CO_L
3C:67:2C Sciovid_Inc
3C:6A:7D Niigata_Power_Systems_Co_Ltd
3C:6F:45 Fiberpro_Inc
3C:70:59 MakerBot_Industries
3C:74:37 RIM
3C:75:4A Motorola_Mobility_Inc
40:33:6C Godrej_Boyce_Mfg_co_ltd
40:40:22 ZIV
40:40:6B Icomera
40:55:39 Cisco_Systems
40:60:5A Hawkeye_Tech_Co_Ltd
40:66:7A mediola_connected_living_AG
40:70:4A Power_Idea_Technology_Limited
40:70:74 Life_Technology_China_Co_Ltd
44:2A:60 Apple_Inc
44:32:2A Avaya_Inc
44:37:6F Young_Electric_Sign_Co
44:38:39 Cumulus_Networks_inc
44:3D:21 Nuvolt
44:4F:5E Pan_Studios_Co_Ltd
44:58:29 Cisco_SPVTG
44:5F:7A Shihlin_Electric_Engineering_Co
44:61:32 ecobee_inc
44:6C:24 Reallin_Electronic_Co_Ltd
44:6D:57 Liteon_Technology_Corporation
48:28:2F ZTE_Corporation
48:34:3D IEP_GmbH
48:5B:39 ASUSTek_COMPUTER_INC
48:5D:60 Azurewave_Technologies_Inc
4C:32:2D TELEDATA_NETWORKS
4C:3B:74 VOGTEC_H_K_Co_Ltd
4C:4B:68 Mobile_Device_Inc
4C:54:27 Linepro_Sp_z_o_o
4C:73:67 Genius_Bytes_Software_Solutions
4C:77:4F Embedded_Wireless_Labs
50:22:67 PixeLINK
50:25:2B Nethra_Imaging_Incorporated
50:2A:7E Smart_electronic_GmbH
50:39:55 Cisco_SPVTG
50:3F:56 Syncmold_Enterprise_Corp
50:46:5D ASUSTek_COMPUTER_INC
50:4A:5E Masimo_Corporation
50:56:63 Texas_Instruments
50:60:28 Xirrus_Inc
50:64:41 Greenlee
50:72:4D BEG_Brueck_Electronic_GmbH
50:79:5B Interexport_Telecomunicaciones_
50:7E:5D Arcadyan_Technology_Corporation
54:31:31 Raster_Vision_Ltd
54:39:68 Edgewater_Networks_Inc
54:42:49 Sony_Corporation
54:46:6B Shenzhen_CZTIC_Electronic_Techn
58:2F:42 Universal_Electric_Corporation
58:34:3B Glovast_Technology_Ltd
58:50:76 Linear_Equipamentos_Eletronicos
58:69:6C Fujian_Ruijie_Networks_co_ltd
58:75:21 CJSC_RTSoft
58:76:75 Beijing_ECHO_Technologies_Co_Lt
5C:24:79 Baltech_AG
5C:35:3B Compal_Broadband_Networks_Inc
5C:40:58 Jefferson_Audio_Video_Systems_I
5C:4A:26 Enguity_Technology_Corp
5C:51:4F Intel_Corporate
5C:59:48 Apple_Inc
5C:6A:7D KENTKART_EGE_ELEKTRONIK_SAN_VE_
5C:6B:32 Texas_Instruments
5C:6D:20 Hon_Hai_Precision_Ind_Co_Ltd
5C:6F:4F S_A_SISTEL
5C:77:57 Haivision_Network_Video
60:2A:54 CardioTek_B_V
60:33:4B Apple_Inc
60:35:53 Buwon_Technology
60:45:5E Liptel_s_r_o
60:54:64 Eyedro_Green_Solutions_Inc
60:67:20 Intel_Corporate
60:6C:66 Intel_Corporate
60:73:5C Cisco
64:27:37 Hon_Hai_Precision_Ind_Co_Ltd
64:31:50 Hewlett_Packard_Company
64:31:7E Dexin_Corporation
64:43:46 GuangDong_Quick_Network_Compute
64:4D:70 dSPACE_GmbH
64:4F:74 LENUS_Co_Ltd
64:51:7E LONG_BEN_DONGGUAN_ELECTRONIC_TE
64:54:22 Equinox_Payments
64:55:63 Intelight_Inc
64:6E:6C Radio_Datacom_LLC
64:76:57 Innovative_Security_Designs
64:7C:34 Ubee_Interactive_Corp
68:23:4B Nihon_Dengyo_Kousaku
68:43:52 Bhuu_Limited
68:5B:36 POWERTECH_INDUSTRIAL_CO_LTD
68:5D:43 Intel_Corporate
68:5E:6B PowerRay_Co_Ltd
68:63:59 Advanced_Digital_Broadcast_SA
68:6E:23 Wi3_Inc
68:72:51 Ubiquiti_Networks
68:78:4C Nortel_Networks
68:79:24 ELS_GmbH_Co_KG
6C:20:56 Cisco
6C:2E:33 Accelink_Technologies_Co_Ltd
6C:3E:6D Apple_Inc
6C:50:4D Cisco_Systems
6C:5D:63 ShenZhen_Rapoo_Technology_Co_Lt
6C:5E:7A Ubiquitous_Internet_Telecom_Co_
6C:62:6D Micro_Star_INT_L_CO_LTD
6C:70:39 Novar_GmbH
70:25:26 Alcatel_Lucent
70:2F:4B PolyVision_Inc
70:3C:39 SEAWING_Kft
70:46:42 CHYNG_HONG_ELECTRONIC_CO_LTD
70:70:4C Purple_Communications_Inc
70:72:3C Huawei_Technologies_Co_Ltd
70:7E:43 Motorola_Mobility_Inc
74:27:3C ChangYang_Technology_Nanjing_Co
74:2F:68 Azurewave_Technologies_Inc
74:31:70 Arcadyan_Technology_Corporation
74:32:56 NT_ware_Systemprg_GmbH
74:4D:79 Arrive_Systems_Inc
74:53:27 COMMSEN_CO_LIMITED
74:7B:7A ETH_Inc
74:7E:2D Beijing_Thomson_CITIC_Digital_T
78:22:3D Affirmed_Networks
78:25:44 Omnima_Limited
78:44:76 Zioncom_technology_co_ltd
78:52:62 Shenzhen_Hojy_Software_Co_Ltd
78:59:3E RAFI_GmbH_Co_KG
78:5C:72 Hioso_Technology_Co_Ltd
78:61:7C MITSUMI_ELECTRIC_CO_LTD
7C:20:64 Alcatel_Lucent_IPD
7C:33:6E MEG_Electronics_Inc
7C:38:6C Real_Time_Logic
7C:39:20 SSOMA_SECURITY
7C:4B:78 Red_Sun_Synthesis_Pte_Ltd
7C:4C:58 Scale_Computing_Inc
7C:6B:33 Tenyu_Tech_Co_Ltd
7C:6B:52 Tigaro_Wireless
7C:6C:39 PIXSYS_SRL
7C:6D:62 Apple_Inc
7C:76:73 ENMAS_GmbH
7C:7D:41 Jinmuyu_Electronics_Co_Ltd
