Active measurements to Root DNS servers especially from Asian - PowerPoint PPT Presentation

Active measurements to Root DNS servers especially from Asian countries Yuji Sekiya sekiya@wide.ad.jp

Probing � Use dnsprobe with dialup connection � 1 probe – 30 min � Running three dnsprobe processes � Probed between 25 th Feb. and 16 th Mar. � Measured � RTT � Stability � Anycast Entity

Selection of Dialup Points � Selected Dialup Points following priority 1. Country 2. ISP 3. City � Some countries prohibited dialup connection from outside. (in-country only) � Vietnam � Laos � North Korea (I’m not sure there is access point)

Dialup Countries � BANGLADESH � NEPAL � CAMBODIA � PAKISTAN � CHINA � PHILIPPNES � HONGKONG � SINGAPORE � INDIA � SRILANKA � INDONESIA � TAIWAN � KOREA � MALAYSIA � MONGOLIA

Details of Dialup Points (1) � CHINA � Cernet Online Information Tech. Ltd. � Beijing � Shenyang � Suzhou � Xiamen � China Netcom Corporation Ltd. � Guanghou � Wuhan � Divixian com Limited. � Shenzhen

Details of Dialup Points (2) � Hong Kong � INDIA � Hong Kong Broadband � HCL Infinet Ltd. Network Ltd. � Delhi, Nasik � Diyixian com Limited. � Pacific Internet India � PCCW IMS Limited. Private Limited. � Mumbai

Details of Dialup Points (3) � INDONESIA � KOREA � CBNNET PT � Hanaro Telecom CYBERINDO � Ansan � Bandung � Inet Hosting Inc. � IndoInternet � Seoul � Jakarta � UniNet � Jakarta � PT Centrin � Pontaniak � IM2 � Surabaya

Details of Dialup Points (4) � MALAYSIA � Nepal � Malaysia Online � Mos.com � Johor Bahru � Biratnagar � Penang � Kathmandu � Asia Connection Corporation � Kuala Lumpur � Pacific Internet (Malaysia) Sdn. Bhd. � Kuala Lumpur

Details of Dialup Points (5) � PHILIPPINES � SINGAPORE � Bayantel, Inc. � Qala Singapore Pte Ltd. � Bacolod � Singapore Telecom. � Cebu � StarHub Pte Ltd. � Innove � T-Systems Singapore Communications, Inc. Pte Ltd. � Cavite � Pacific Internet Philippines, Inc. � Laguna � Infodyne, Inc. � Manila

Details of Dialup Points (6) � CAMBODIA � TAIWAN � Eureka Online (Pvt) � Taiwan Limited. Telecommunication Network Services Co., � Colombo Ltd. � MTM Networks Pvt. Ltd. � Taipei � Colombo � Diyixian.com Limited � Lanka Internet Services � Taipei Limited. � Kandy

Compensation of Measured RTT � Dialup RTT � Measured Dialup RTT by ping to PPP peering address � Use minimal RTT as Dialup RTT � Actual RTT = Measured RTT – Dialup RTT

Anycast of F-root � CHINA � KOREA � pek1{a,b}, pao1a � sfo2b, sel1a � Hong Kong � MALAYSIA � hkg1a � pao1a, hkg1b, ams1b � INDIA � PHILIPPINES � pao1b, lga1a � pao1{a,b} � INDONESIA � SINGAPORE � cgk1{a,b} � pao1{a,b}, sin1a, ams1a � TAIWAN � SRI LANKA � hkg1a � pao1b, ams1b

Anycast of I-root � CHINA � KOREA � s1.bei, s1.bkx � s1.tok, s1.bkx � Hong Kong � MALAYSIA � s1.bkx � s1.pix, s1.bkx � INDIA � PHILIPPINES � s1.bkx, timeout � s1.pix, s1.tok, s1.ams � INDONESIA � SINGAPORE � s1.gen, timeout, timeout � s1.bkx, s1.sin, s1.gen � TAIWAN � SRI LANKA � s1.bkx � s1.pix, s1.bkx, s1.ank

Anycast of J-root � CHINA � KOREA � jns-jgtld, jns-kr � jns-hgtld, jns-kr � Hong Kong � MALAYSIA � jns-jgtld � jns-jgtld, jns-elsyd, jns- mgtld � INDIA � PHILIPPINES � jns-eliad, jns-elsyd � jns-elsyd, jns-eliad, jns-kr � INDONESIA � SINGAPORE � jns-kr � jns-mgtld, jns-elsyd � TAIWAN � SRI LANKA � jns-kr � jns-jgtld, jns-kr, jns-lgtld

Anycast of K-root � CHINA � KOREA � k1.tokyo, k2.linx, k1.linx � k2.linx � Hong Kong � MALAYSIA � k2.denic � k1.tokyo, k1.denic, k2.linx � INDIA � PHILIPPINES � k2.delhi, k1.delhi � k1.tokyo, k1.denic � INDONESIA � SINGAPORE � k2.linx � k2.linx, k2.tokyo � TAIWAN � SRI LANKA � k2.denic � k2.tokyo, k2.linx

Anycast of M-root � CHINA � KOREA � M-d � M-d � Hong Kong � MALAYSIA � M-d � M-d, M-x � INDIA � PHILIPPINES � M-cdg, M-d � M-cdg, M-x, M-d � INDONESIA � SINGAPORE � M-d � M-x, M-d � TAIWAN � SRI LANKA � M-d � M-d

RTT results from CHINA

RTT results from Hong Kong

RTT results from INDIA

RTT results from INDONESIA

RTT results from KOREA

RTT results from MALAYSIA

RTT results from PHILIPPINES

RTT results from SINGAPORE

RTT results from Sri Lanka

RTT results fromTAIWAN

Summary � Anycasting � Expected coverage ? � Timeout problem of I-root � F-root works fine � Indonesia, Hong Kong, China, Taiwan � F, I, J, K, M � Anycast roots have better reachability than non-Anycast roots from Asian countries � Reachability from Asian countries may be improved by anycasting � M has advantage of physical location for Asian countries.