December 2012 - Test - lists.nanog.org

Fiber only in DataCenters?
by James Wininger 24 Dec '12

24 Dec '12

Hello all, Looking for input from "providers" as well as "consumers" of data center space and facilities. Specifically speaking to the types of available physical cross connects. Are there data centers out there that are "fiber only"? That is to say that the cross connects are fiber only and no copper cross connects are available? I understand that fiber is great and all, but to my knowledge there are a lot of folks still using and needing copper cross connects. Am I wrong? -- Jim

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Validation of FCS
by Jason Lixfeld 24 Dec '12

24 Dec '12

Hi all, I'm trying to confirm (or debunk) my current understanding of FCS errors. An FCS error is a layer 2 error. In Ethernet spake, the 4 bytes of FCS data within each Ethernet frame is validated by a CRC check, which is done by the device receiving said frame. If the CRC check fails, an FCS error is reported by that receiving device. If that understanding is true and presuming a "circuit" was made up of many layer 2 devices between the A and Z side of said circuit, it would be impossible for a CRC error somewhere along the path of that circuit to register on the receiving device of either the A or Z side. Perhaps in simpler terms, a CRC error is a localized thing and would never be forwarded from one device to another. Is that fair and/or accurate? Thanks in advance.

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Hurricane Electric Tunnelbroker staff?
by Ben Carleton 23 Dec '12

23 Dec '12

Hi folks, I am seeing an IPv6-connected host on my network (which is on a HE.net tunnel) apparently being portscanned by an HE server at 2001:470:0:64::2 for about the last hour or so. It is trying to hit several different ports four times each before moving on and eventually repeating itself. If anyone from HE can shed some light on what's going on here it would be greatly appreciated, I can provide the IP of the host in question off-list if needed. Thanks, -- Ben

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Re: Hurricane Electric Tunnelbroker staff?
by Ben Carleton 23 Dec '12

23 Dec '12

On 12/23/2012 5:23 PM, Constantine A. Murenin wrote: > On 23 December 2012 14:15, Ben Carleton <ben(a)bencarleton.com> wrote: >> On 12/23/2012 12:31 AM, Ben Carleton wrote: >>> Hi folks, >>> >>> I am seeing an IPv6-connected host on my network (which is on a HE.net >>> tunnel) apparently being portscanned by an HE server at 2001:470:0:64::2 for >>> about the last hour or so. It is trying to hit several different ports four >>> times each before moving on and eventually repeating itself. >>> >>> If anyone from HE can shed some light on what's going on here it would be >>> greatly appreciated, I can provide the IP of the host in question off-list >>> if needed. >>> >>> Thanks, >>> -- Ben >>> >> Thank you to everyone who responded on and off-list, we've got this >> resolved. > Don't worry, we don't care for what the resolution is; no need to post > it to the list, either, the next person can just re-post this question > anyways! > > Thank you for wasting everyone's time! > > C. I actually have no idea what the resolution was. All I know is that when I checked again a few hours later, the traffic had stopped, which, to be honest, is good enough for me. -- Ben

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Re: Hurricane Electric Tunnelbroker staff?
by Randy 23 Dec '12

23 Dec '12

> Hi folks, > > I am seeing an IPv6-connected host on my network (which is on a HE.net > tunnel) apparently being portscanned by an HE server at > 2001:470:0:64::2 for about the last hour or so. It is trying to hit > several different ports four times each before moving on and > eventually repeating itself. > > If anyone from HE can shed some light on what's going on here it would > be greatly appreciated, I can provide the IP of the host in question > off-list if needed. > > Thanks, > -- Ben Their contact is ipv6(a)he.net Pretty quick response last time I contacted them. The port scans are usually the result of the initiator of the tunnel activating a simple security scanner. As far as I know it works only on an address that is bound to their account. It shouldn't be repeating itself unless there is some sort of error.

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WW: Imminent Death Of USENET predicted; film at... wait; what?
by Jay Ashworth 22 Dec '12

22 Dec '12

http://craphound.com/overclocked/Cory_Doctorow_-_Overclocked_-_When_Sysadmi… Happy Apocalypse, everybody. Cheers, -- jra -- Jay R. Ashworth Baylink jra(a)baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII St Petersburg FL USA #natog +1 727 647 1274

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JunOS IPv6 announcements over IPv4 BGP
by Pete Ashdown 21 Dec '12

21 Dec '12

I've got a peer who wishes me to send my IPv6 announcements over IPv4 BGP. I'm running around in circles with JTAC trying to find out how to do this in JunOS. Does anyone have a snippet they can send me?

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BGP Update Report
by cidr-report＠potaroo.net 21 Dec '12

21 Dec '12

BGP Update Report Interval: 13-Dec-12 -to- 20-Dec-12 (7 days) Observation Point: BGP Peering with AS131072 TOP 20 Unstable Origin AS Rank ASN Upds % Upds/Pfx AS-Name 1 - AS8402 39344 2.0% 27.5 -- CORBINA-AS OJSC "Vimpelcom" 2 - AS3909 38045 1.9% 4755.6 -- QWEST-AS-3908 - Qwest Communications Company, LLC 3 - AS9829 37060 1.9% 42.7 -- BSNL-NIB National Internet Backbone 4 - AS29124 35162 1.8% 1004.6 -- SU29-AS ISP "Gorcom" 5 - AS12768 33148 1.7% 338.2 -- ER-TELECOM-AS CJSC "ER-Telecom Holding" 6 - AS29256 24612 1.3% 1447.8 -- INT-PDN-STE-AS Syrian Telecommunications Establishment 7 - AS23685 22669 1.2% 985.6 -- CAT-HUTCH-AS-AP Hutchison CAT Wireless Multimedia Ltd, 8 - AS1637 17517 0.9% 208.5 -- DNIC-AS-01637 - Headquarters, USAISC 9 - AS7303 17366 0.9% 4.9 -- Telecom Argentina S.A. 10 - AS29614 16767 0.9% 698.6 -- GHANATEL-AS 11 - AS29049 14790 0.8% 45.0 -- DELTA-TELECOM-AS Delta Telecom LTD. 12 - AS4755 14020 0.7% 12.3 -- TATACOMM-AS TATA Communications formerly VSNL is Leading ISP 13 - AS17974 13252 0.7% 7.8 -- TELKOMNET-AS2-AP PT Telekomunikasi Indonesia 14 - AS5972 12186 0.6% 86.4 -- DNIC-ASBLK-05800-06055 - DoD Network Information Center 15 - AS2708 11439 0.6% 83.5 -- Universidad de Guanajuato 16 - AS9583 10668 0.5% 9.0 -- SIFY-AS-IN Sify Limited 17 - AS24560 10611 0.5% 11.0 -- AIRTELBROADBAND-AS-AP Bharti Airtel Ltd., Telemedia Services 18 - AS4538 10468 0.5% 22.8 -- ERX-CERNET-BKB China Education and Research Network Center 19 - AS7552 10203 0.5% 9.2 -- VIETEL-AS-AP Vietel Corporation 20 - AS4780 10086 0.5% 17.9 -- SEEDNET Digital United Inc. TOP 20 Unstable Origin AS (Updates per announced prefix) Rank ASN Upds % Upds/Pfx AS-Name 1 - AS2033 8850 0.5% 8850.0 -- PANIX - Panix Network Information Center 2 - AS24057 8307 0.4% 8307.0 -- AIGL-AS-AP PT. AIA FINANCIAL, Insurance company, Indonesia 3 - AS3909 38045 1.9% 4755.6 -- QWEST-AS-3908 - Qwest Communications Company, LLC 4 - AS6174 5655 0.3% 2827.5 -- SPRINTLINK8 - Sprint 5 - AS26799 5486 0.3% 2743.0 -- DKR - DKR CAPITAL 6 - AS6197 2633 0.1% 2633.0 -- BATI-ATL - BellSouth Network Solutions, Inc 7 - AS14680 5076 0.3% 1692.0 -- REALE-6 - Auction.com 8 - AS37430 1538 0.1% 1538.0 -- vdctelecom 9 - AS29256 24612 1.3% 1447.8 -- INT-PDN-STE-AS Syrian Telecommunications Establishment 10 - AS6629 5698 0.3% 1424.5 -- NOAA-AS - NOAA 11 - AS41674 1387 0.1% 1387.0 -- ALVARION-AS Alvarion SRL 12 - AS17293 3879 0.2% 1293.0 -- VTXC - VTX Communications 13 - AS1562 2556 0.1% 1278.0 -- DNIC-ASBLK-01550-01601 - DoD Network Information Center 14 - AS57918 1138 0.1% 1138.0 -- ACOD-AS ACOD CJSC 15 - AS4 3192 0.2% 88.0 -- COMUNICALO DE MEXICO S.A. DE C.V 16 - AS29124 35162 1.8% 1004.6 -- SU29-AS ISP "Gorcom" 17 - AS23685 22669 1.2% 985.6 -- CAT-HUTCH-AS-AP Hutchison CAT Wireless Multimedia Ltd, 18 - AS9950 1850 0.1% 925.0 -- PUBNETPLUS2-AS-KR DACOM 19 - AS37263 877 0.0% 877.0 -- UNIVEDU 20 - AS15825 3062 0.2% 765.5 -- UNSPECIFIED TOP 20 Unstable Prefixes Rank Prefix Upds % Origin AS -- AS Name 1 - 151.118.18.0/24 12670 0.6% AS3909 -- QWEST-AS-3908 - Qwest Communications Company, LLC 2 - 151.118.254.0/24 12645 0.6% AS3909 -- QWEST-AS-3908 - Qwest Communications Company, LLC 3 - 151.118.255.0/24 12644 0.6% AS3909 -- QWEST-AS-3908 - Qwest Communications Company, LLC 4 - 209.48.168.0/24 8850 0.4% AS2033 -- PANIX - Panix Network Information Center 5 - 202.14.255.0/24 8307 0.4% AS24057 -- AIGL-AS-AP PT. AIA FINANCIAL, Insurance company, Indonesia 6 - 12.30.238.0/24 5480 0.3% AS26799 -- DKR - DKR CAPITAL 7 - 192.58.232.0/24 5419 0.3% AS6629 -- NOAA-AS - NOAA 8 - 194.63.9.0/24 4558 0.2% AS1273 -- CW Cable and Wireless Worldwide plc 9 - 12.139.133.0/24 4280 0.2% AS14680 -- REALE-6 - Auction.com 10 - 69.38.178.0/24 4173 0.2% AS19406 -- TWRS-MA - Towerstream I, Inc. 11 - 202.171.192.0/20 3583 0.2% AS4788 -- TMNET-AS-AP TM Net, Internet Service Provider 12 - 81.200.3.0/24 3379 0.2% AS29124 -- SU29-AS ISP "Gorcom" 13 - 81.200.23.0/24 3035 0.1% AS29124 -- SU29-AS ISP "Gorcom" 14 - 81.200.8.0/24 3020 0.1% AS29124 -- SU29-AS ISP "Gorcom" 15 - 81.200.4.0/24 3019 0.1% AS29124 -- SU29-AS ISP "Gorcom" 16 - 81.200.1.0/24 3013 0.1% AS29124 -- SU29-AS ISP "Gorcom" 17 - 81.200.22.0/24 3011 0.1% AS29124 -- SU29-AS ISP "Gorcom" 18 - 81.200.16.0/24 3009 0.1% AS29124 -- SU29-AS ISP "Gorcom" 19 - 81.200.20.0/24 3008 0.1% AS29124 -- SU29-AS ISP "Gorcom" 20 - 81.200.12.0/24 3002 0.1% AS29124 -- SU29-AS ISP "Gorcom" Details at http://bgpupdates.potaroo.net ------------------------------------ Copies of this report are mailed to: nanog(a)nanog.org eof-list(a)ripe.net apops(a)apops.net routing-wg(a)ripe.net afnog(a)afnog.org

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The Cidr Report
by cidr-report＠potaroo.net 21 Dec '12

21 Dec '12

This report has been generated at Fri Dec 21 21:13:09 2012 AEST. The report analyses the BGP Routing Table of AS2.0 router and generates a report on aggregation potential within the table. Check http://www.cidr-report.org for a current version of this report. Recent Table History Date Prefixes CIDR Agg 14-12-12 440081 251672 15-12-12 439802 251907 16-12-12 439907 252026 17-12-12 439983 251974 18-12-12 439300 252062 19-12-12 440076 252503 20-12-12 440600 252771 21-12-12 440351 252566 AS Summary 43021 Number of ASes in routing system 17901 Number of ASes announcing only one prefix 3473 Largest number of prefixes announced by an AS AS7029 : WINDSTREAM - Windstream Communications Inc 115356896 Largest address span announced by an AS (/32s) AS4134 : CHINANET-BACKBONE No.31,Jin-rong Street Aggregation Summary The algorithm used in this report proposes aggregation only when there is a precise match using the AS path, so as to preserve traffic transit policies. Aggregation is also proposed across non-advertised address space ('holes'). --- 21Dec12 --- ASnum NetsNow NetsAggr NetGain % Gain Description Table 440782 252620 188162 42.7% All ASes AS6389 3121 137 2984 95.6% BELLSOUTH-NET-BLK - BellSouth.net Inc. AS28573 2249 70 2179 96.9% NET Servicos de Comunicao S.A. AS17974 2488 450 2038 81.9% TELKOMNET-AS2-AP PT Telekomunikasi Indonesia AS4766 2926 925 2001 68.4% KIXS-AS-KR Korea Telecom AS7029 3473 1608 1865 53.7% WINDSTREAM - Windstream Communications Inc AS22773 1947 171 1776 91.2% ASN-CXA-ALL-CCI-22773-RDC - Cox Communications Inc. AS18566 2081 423 1658 79.7% COVAD - Covad Communications Co. AS10620 2268 651 1617 71.3% Telmex Colombia S.A. AS7303 1674 397 1277 76.3% Telecom Argentina S.A. AS4323 1601 402 1199 74.9% TWTC - tw telecom holdings, inc. AS4755 1660 555 1105 66.6% TATACOMM-AS TATA Communications formerly VSNL is Leading ISP AS2118 1052 53 999 95.0% RELCOM-AS OOO "NPO Relcom" AS7552 1148 221 927 80.7% VIETEL-AS-AP Vietel Corporation AS7545 1821 945 876 48.1% TPG-INTERNET-AP TPG Internet Pty Ltd AS18101 1017 170 847 83.3% RELIANCE-COMMUNICATIONS-IN Reliance Communications Ltd.DAKC MUMBAI AS8151 1581 738 843 53.3% Uninet S.A. de C.V. AS1785 1940 1157 783 40.4% AS-PAETEC-NET - PaeTec Communications, Inc. AS4808 1123 352 771 68.7% CHINA169-BJ CNCGROUP IP network China169 Beijing Province Network AS13977 856 118 738 86.2% CTELCO - FAIRPOINT COMMUNICATIONS, INC. AS18881 740 40 700 94.6% Global Village Telecom AS855 716 53 663 92.6% CANET-ASN-4 - Bell Aliant Regional Communications, Inc. AS9808 680 30 650 95.6% CMNET-GD Guangdong Mobile Communication Co.Ltd. AS17676 712 92 620 87.1% GIGAINFRA Softbank BB Corp. AS3356 1118 504 614 54.9% LEVEL3 Level 3 Communications AS3549 1053 444 609 57.8% GBLX Global Crossing Ltd. AS22561 1041 443 598 57.4% DIGITAL-TELEPORT - Digital Teleport Inc. AS19262 999 404 595 59.6% VZGNI-TRANSIT - Verizon Online LLC AS24560 1037 452 585 56.4% AIRTELBROADBAND-AS-AP Bharti Airtel Ltd., Telemedia Services AS22047 579 22 557 96.2% VTR BANDA ANCHA S.A. AS4804 632 96 536 84.8% MPX-AS Microplex PTY LTD Total 45333 12123 33210 73.3% Top 30 total Possible Bogus Routes 10.86.64.32/30 AS65530 -Private Use AS- 10.86.64.36/30 AS65530 -Private Use AS- 10.86.65.32/30 AS65530 -Private Use AS- 10.86.65.36/30 AS65530 -Private Use AS- 10.255.255.0/30 AS65530 -Private Use AS- 10.255.255.4/30 AS65530 -Private Use AS- 10.255.255.8/30 AS65530 -Private Use AS- 27.112.114.0/24 AS23884 PROENNET-AS Proimage Engineering and Communication Co.,Ltd. 41.222.80.0/21 AS37110 moztel-as 62.12.96.0/19 AS38478 SUNNYVISION-AS-AP SunnyVision Limited 62.61.220.0/24 AS24974 TACHYON-EU Tachyon Europe BV 62.61.221.0/24 AS24974 TACHYON-EU Tachyon Europe BV 64.66.32.0/20 AS18864 64.185.224.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.225.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.226.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.227.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.228.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.229.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.230.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.231.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.232.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.233.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.234.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.235.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.236.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.237.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.238.0/24 AS27431 JTLNET - JTL Networks Inc. 64.185.239.0/24 AS27431 JTLNET - JTL Networks Inc. 64.187.208.0/24 AS174 COGENT Cogent/PSI 64.187.209.0/24 AS23005 SWITCH-COMMUNICATIONS - SWITCH Communications Group LLC 65.111.1.0/24 AS32258 SDNGLOBAL - SDN Global 66.180.239.0/24 AS35888 VIGNETTE - VIGNETTE CORPORATION 66.245.176.0/20 AS19318 NJIIX-AS-1 - NEW JERSEY INTERNATIONAL INTERNET EXCHANGE LLC 66.251.128.0/24 AS33227 BLUEBRIDGE-NETWORKS - Blue Bridge Networks 66.251.133.0/24 AS33227 BLUEBRIDGE-NETWORKS - Blue Bridge Networks 66.251.134.0/24 AS33227 BLUEBRIDGE-NETWORKS - Blue Bridge Networks 66.251.136.0/21 AS33227 BLUEBRIDGE-NETWORKS - Blue Bridge Networks 66.251.140.0/24 AS33227 BLUEBRIDGE-NETWORKS - Blue Bridge Networks 66.251.141.0/24 AS33227 BLUEBRIDGE-NETWORKS - Blue Bridge Networks 66.251.142.0/24 AS33227 BLUEBRIDGE-NETWORKS - Blue Bridge Networks 66.251.143.0/24 AS3356 LEVEL3 Level 3 Communications 68.234.0.0/19 AS40430 COLO4JAX-AS - colo4jax, LLC 69.46.224.0/20 AS32592 HUNT-BROTHERS-OF-LOUISIANA-LLC - Hunt Brothers 69.46.233.0/24 AS32592 HUNT-BROTHERS-OF-LOUISIANA-LLC - Hunt Brothers 69.46.236.0/24 AS32592 HUNT-BROTHERS-OF-LOUISIANA-LLC - Hunt Brothers 69.165.92.0/24 AS20077 IPNETZONE-ASN - IPNetZone 71.19.134.0/23 AS3313 INET-AS BT Italia S.p.A. 72.35.224.0/22 AS30097 NUWAVE - NuWave 72.35.229.0/24 AS30188 TELEVERGENCE - Televergence Solutions Inc. 72.35.232.0/21 AS30097 NUWAVE - NuWave 72.44.16.0/20 AS15054 NORTHEAST-TEXAS-BROADBAND-LLC - Northeast Texas Broadband, LLC 74.91.48.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.49.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.50.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.51.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.52.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.53.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.54.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.55.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.56.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.57.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.58.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.59.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.60.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.61.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.62.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.91.63.0/24 AS30137 SEA-BROADBAND - Sea Broadband, LLC 74.115.124.0/23 AS46540 NARSASN - National Asset Recovery Services, Inc 81.4.0.0/18 AS38478 SUNNYVISION-AS-AP SunnyVision Limited 81.22.64.0/20 AS5511 OPENTRANSIT France Telecom S.A. 82.101.160.0/19 AS5511 OPENTRANSIT France Telecom S.A. 91.217.250.0/24 AS43108 GARM-AS Garm Technologies Ltd. 100.100.0.0/24 AS4847 CNIX-AP China Networks Inter-Exchange 102.2.88.0/22 AS38456 PACTEL-AS-AP Pacific Teleports. 110.34.44.0/22 AS12653 COMTONET KB Impuls Hellas S.A. 116.206.72.0/24 AS6461 MFNX MFN - Metromedia Fiber Network 116.206.85.0/24 AS6461 MFNX MFN - Metromedia Fiber Network 116.206.103.0/24 AS6461 MFNX MFN - Metromedia Fiber Network 117.120.56.0/21 AS4755 TATACOMM-AS TATA Communications formerly VSNL is Leading ISP 121.46.0.0/16 AS4134 CHINANET-BACKBONE No.31,Jin-rong Street 142.54.0.0/19 AS23498 CDSI - Cogeco Data Services LP 172.102.0.0/22 AS4812 CHINANET-SH-AP China Telecom (Group) 172.116.0.0/24 AS7018 ATT-INTERNET4 - AT&T Services, Inc. 185.14.0.0/22 AS41090 E-LIANCE Equation SA 200.1.112.0/24 AS29754 GO2TEL GO2TEL.COM INC. 200.53.0.0/19 AS13878 Diveo do Brasil Telecomunicacoes Ltda 200.58.248.0/21 AS27849 202.8.106.0/24 AS9530 SHINSEGAE-AS SHINSEGAE I&C Co., Ltd. 202.58.113.0/24 AS19161 202.65.96.0/20 AS2706 PI-HK Pacnet Internet (Hong Kong) Limited 202.73.240.0/20 AS2706 PI-HK Pacnet Internet (Hong Kong) Limited 202.83.120.0/21 AS37972 202.83.124.0/24 AS37972 202.83.125.0/24 AS37972 202.83.126.0/24 AS37972 202.94.1.0/24 AS4808 CHINA169-BJ CNCGROUP IP network China169 Beijing Province Network 202.174.125.0/24 AS9498 BBIL-AP BHARTI Airtel Ltd. 202.176.1.0/24 AS9942 COMINDICO-AP SOUL Converged Communications Australia 202.179.134.0/24 AS23966 LDN-AS-PK LINKdotNET Telecom Limited 203.23.1.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications 203.24.38.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications 203.30.127.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications 203.32.86.0/23 AS18111 NETSPEED-AS-AP Netspeed Internet Communications 203.32.86.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications 203.32.87.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications 203.32.188.0/24 AS1221 ASN-TELSTRA Telstra Pty Ltd 203.142.219.0/24 AS45149 204.9.116.0/22 AS30097 NUWAVE - NuWave 204.10.88.0/21 AS3356 LEVEL3 Level 3 Communications 204.10.92.0/23 AS30097 NUWAVE - NuWave 204.10.94.0/23 AS30097 NUWAVE - NuWave 204.10.112.0/21 AS27027 ANBELL ASN-ANBELL 205.175.214.0/24 AS5583 ORANGE-BUSINESS-SERVICES-BENELUX France Telecom S.A. 206.197.184.0/24 AS23304 DATOTEL-STL-AS - Datotel LLC, a NetLabs LLC Company 206.221.176.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.177.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.178.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.179.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.180.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.181.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.182.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.183.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.184.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.185.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.186.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.187.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.188.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.189.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.190.0/24 AS27431 JTLNET - JTL Networks Inc. 206.221.191.0/24 AS27431 JTLNET - JTL Networks Inc. 207.174.131.0/24 AS26116 INDRA - Indra's Net Inc 207.174.132.0/23 AS26116 INDRA - Indra's Net Inc 207.174.152.0/23 AS26116 INDRA - Indra's Net Inc 207.174.154.0/24 AS26116 INDRA - Indra's Net Inc 207.174.155.0/24 AS26116 INDRA - Indra's Net Inc 207.174.200.0/24 AS22658 EARTHNET - Earthnet, Inc. 207.174.248.0/21 AS6653 PRIVATEI - privateI, LLC 207.231.96.0/19 AS11194 NUNETPA - NuNet Inc. 207.254.128.0/21 AS30689 FLOW-NET - FLOW 207.254.128.0/24 AS30689 FLOW-NET - FLOW 207.254.136.0/21 AS30689 FLOW-NET - FLOW 207.254.138.0/24 AS30689 FLOW-NET - FLOW 207.254.140.0/24 AS30689 FLOW-NET - FLOW 208.83.53.0/24 AS40569 YGOMI-AS - Ygomi LLC 208.87.96.0/21 AS40638 208.89.32.0/24 AS27431 JTLNET - JTL Networks Inc. 208.89.33.0/24 AS27431 JTLNET - JTL Networks Inc. 208.89.34.0/24 AS27431 JTLNET - JTL Networks Inc. 208.89.35.0/24 AS27431 JTLNET - JTL Networks Inc. 209.148.64.0/19 AS13773 TELNETCOMM - Telnet Communications 209.177.64.0/20 AS6461 MFNX MFN - Metromedia Fiber Network 209.213.0.0/20 AS33005 ELTOPIA - Eltopia.com, LLC 213.150.204.0/24 AS29338 AFOL-AS Used by Africaonline Operations 216.12.160.0/20 AS26627 AS-PILOSOFT - Pilosoft, Inc. 216.146.0.0/19 AS11915 TELWEST-NETWORK-SVCS-STATIC - TEL WEST COMMUNICATIONS LLC 216.227.142.0/23 AS46856 GLOBAL-HOST-AS - The Global Host Exchange 216.227.144.0/21 AS46856 GLOBAL-HOST-AS - The Global Host Exchange 216.234.128.0/22 AS14545 ADR-DRIVING-RECORDS - AMERICAN DRIVING RECORDS, INC. 216.234.132.0/24 AS14545 ADR-DRIVING-RECORDS - AMERICAN DRIVING RECORDS, INC. 216.234.139.0/24 AS14545 ADR-DRIVING-RECORDS - AMERICAN DRIVING RECORDS, INC. Please see http://www.cidr-report.org for the full report ------------------------------------ Copies of this report are mailed to: nanog(a)nanog.org eof-list(a)ripe.net apops(a)apops.net routing-wg(a)ripe.net afnog(a)afnog.org

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RE: NANOG Digest, Vol 59, Issue 80
by Jakob Heitz 21 Dec '12

21 Dec '12

Voltage causes sparks, but... Maybe you got the spark when you disconneted the wire. In that case, you likely have a ground loop carrying current and a long wire. When you disconnect the wire, the current wants to keep flowing due to loop inductance. This causes the voltage spike and hence the spark. > Date: Fri, 21 Dec 2012 14:14:29 -0600 > From: "Naslund, Steve" <SNaslund(a)medline.com> > To: "George Herbert" <george.herbert(a)gmail.com>, "Matthew Kaufman" > <matthew(a)matthew.at> Cc: nanog(a)nanog.org > Subject: RE: Fiber only in DataCenters? > Message-ID: > <2A76E400AC84B845AAC35AA19F8E7A5D0DB3E9E1(a)MUNEXBE1.medline.com> > Content-Type: text/plain; charset="us-ascii" > > It takes a lot of voltage to cause an arcing spark. I would suspect > static buildup along the way and bad grounding. Even a big facility > with a good ground should not have enough voltage differential between > grounding points to cause sparks. Having the right size rack > grounding should give you a very low resistance to ground from any > point. The most common problem I have seen in large facilities is > multiple grounds > that are not tied together or cables that are grounded at multiple > points causing a loop current. It is critical that everything have a > single ground, that includes racks, electrical distribution, > cable tray, > etc. Most Cat X cables are unshielded and do not have a ground > conductor so you must have equipment at the same potential at > both ends > or you will get loop current for sure. > > As far as voltage in Cat X cables, the real factor is the current > carrying capacity of a particular wire gage. It does not really matter > whether it is Cat 6 or a coat hanger, current capacity is a > function of > cable cross section and what material it is made of. Copper has a > specific resistance as do all other metals. A copper cable needs to > have enough cross section to dissipate the heat generated by its > resistance. A less conductive material requires more cross section to > dissipate the increased heat. At extremely high voltages > things become > more complex because of the skin affect that causes the power to move > through the outer parts of the cable more than the inner parts. These > levels are not a factor in communications cables. > > The main factor for fiber over copper in data centers is all > about cost. > Most servers include copper connections and fiber costs > something extra. > For switches, the cost of the optics is significant. Fiber does help > prevent damage due to surges or electrical faults but if these are a > problem in your datacenter you have bigger fish to fry. > > Steven Naslund -- Jakob Heitz.

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