1 PingER: Methodology, Uses & Results Prepared by Les Cottrell, SLAC, for the Extending the Reach of Advanced Networking: Special International Workshop Arlington, VA., April 22, Partially funded by DOE/MICS Field Work Proposal on Internet End-to-end Performance Monitoring (IEPM), also supported by IUPAP

2 Outline What is PingER World Internet performance trends Regions and Digital Divide Examples of use Challenges Summary of state of world Internet performance

3 Methodology Use ubiquitous ping Each 30 minutes from monitoring site to target : –1 ping to prime caches –by default send11x100Byte pkts followed by 10x1000Byte pkts Low network impact good for developing world Record loss & RTT, (+ reorders, duplicates) Derive throughput, jitter, unreachability …

4 Architecture Hierarchical vs. full mesh WWW Archive Monitoring Remote FNAL Reports & Data Cache Monitoring SLAC Ping HTTP Archive 1 monitor host remote host pair

5 PingER Benefits Provides quantitative historical (> 9yrs) and near real-time information –Aggregate by regions, affiliations etc. –How bad is performance to various regions, rank countries? –Trends: who is catching up, falling behind, is progress being made? –Compare vs. economic, development indicators etc. Use for trouble shooting setting expectations, identify needed upgrades, choosing a provider, presenting to policy makers, funding bodies Monitoring site vs. Remote sites screen shot Aimed at: end-user (net-admin & sophisticated user), planners Measures analyzes & reports round-trip times, losses, availability, throughput... –Uses ubiquitous ping, no special host, or software to install/configure at remote sites, no passwords or credentials needed –Low impact on network << 100bits/s, important for many DD sites –Covers 100+ countries (> 90% of Internet connected population)

6 Regions Monitored Recent added NIIT PK as monitoring site White = no host monitored in country Colors indicate regions Also have affinity groups (VOs), e.g. AMPATH, Silk Road, CMS, XIWT and can select multiple groups

7 World Trends Increase in sites with Good (<1%) loss 25% increase in sites monitored –Big focus on Africa 4=>19 countries –Silk Road

8 Trends S.E. Europe, Russia: catching up Latin Am., Mid East, China: keeping up India, Africa: falling behind Derived throughput~MSS/(RTT*sqrt(loss))

9 Current State – Aug ‘03 thruput ~ MSS / (RTT * sqrt(loss)) Within region performance better –E.g. Ca|EDU|GOV-NA, Hu-SE Eu, Eu-Eu, Jp-E Asia, Au-Au, Ru- Ru|Baltics Africa, Caucasus, Central & S. Asia all bad Bad < 200kbits/s < DSL Poor > 200, < 500kbits/s Acceptable > 500kbits/s, < 1000kbits/s Good > 1000kbits/s

10 Examples of Use Need for constant upgrades Upgrades Filtering Pakistan

11 Usage Examples Selecting ISPs for DSL/Cable services for home users –Monitor accessibility of routers etc. from site –Long term and changes Trouble shooting –Identifying problem reported is probably network related –Identify when it started and if still happening or fixed –Look for patterns: Step functions Periodic behavior, e.g. due to congestion Multiple sites with simultaneous problems, e.g. common problem link/router … –Provide quantitative information to ISPs Identify need to upgrade and effects BW increase by factor 300 Multiple sites track Xmas & summer holiday

12 Russia E.g. Upgrade to KEK-BINP link from 128kbps to 512kbps, May ’02: improved from few % loss to ~0.1% loss Russian losses improved by factor 5 in last 2 years, due to multiple upgrades

13 Usage Examples Ten-155 became operational on December 11. murf Filters Smurf Filters installed on NORDUnet’s US connection. To North America To Western Europe Peering problems, took long time identify/fix Upgrades & ping filtering

14 Pakistan Conclusions Big performance differences to sites, depend on ISP (at least 3 ISPs seen for Pakistan A&R sites) To NIIT: –Get about 300Kbps, possibly 380Kbps at best –Verified bottleneck appeared to be in Pakistan –Requested upgrade to 1Mbps, and verified got it –There is often congestion (packet loss & extended RTTs) during busy periods each weekday –Video will probably be sensitive to packet loss, so it may depend on the time of day –H.323 (typically needs 384Kbps + 64Kbps), would appear to be marginal at best at any time. No peering Pakistan between NIIT and NSC

15 Challenges Effort: –Negligible for remote hosts –Monitoring host: < 1 day to install and configure, occasional updates to remote host tables and problem response –Archive host: 20% FTE, code stable, could do with upgrade, contact monitoring sites whose data is inaccessible –Analysis: your decision, usually for long term details download & use Excel –Trouble-shooting: usually re-active, user reports, then look at PingER data have played with automating alerts, data will/is available via web services Ping blocking –Complete block easy to ID, then contact site to try and by-pass, can be frustrating for 3 rd world –Partial blocks trickier, compare with synack Funding –“Unfortunately, network management research has historically been very under- funded, because it is difficult to get funding bodies to recognize this as legitimate networking research.” Sally Floyd, IAB Concerns & Recommendations Regarding Internet Research & Evolution. –

16 Summary Performance from U.S. & Europe is improving all over Performance to developed countries are orders of magnitude better than to developing countries Poorer regions 5-10 years behind Poorest regions Africa, Caucasus, Central & S. Asia Some regions are: –catching up (SE Europe, Russia), –keeping up (Latin America, Mid East, China), –falling further behind (e.g. India, Africa)

17 More Information PingER: –www-iepm.slac.stanford.edu/pinger/www-iepm.slac.stanford.edu/pinger/ MonaLisa –monalisa.cacr.caltech.edu/monalisa.cacr.caltech.edu/ GGF/NMWG –www-didc.lbl.gov/NMWG/www-didc.lbl.gov/NMWG/ ICFA/SCIC Network Monitoring report, Jan03 – Monitoring the Digital Divide, CHEP03 paper –arxiv.org/ftp/physics/papers/0305/ pdfarxiv.org/ftp/physics/papers/0305/ pdf Human Development Index – Network Readiness Index –

18 Extra Slides

19 Visualization Keep it simple, enable user to do their own by making data available Tables –Time series ( www-iepm.slac.stanford.edu/cgi- wrap/pingtable.pl ): www-iepm.slac.stanford.edu/cgi- wrap/pingtable.pl select metric (loss, RTT etc.), time ticks, packet size, aggregations from/to, etc. Color code numbers, provide sort, drill down to graphs, download data (TSV), statistical summaries –Monitoring site vs. Remote sites ( www- iepm.slac.stanford.edu/cgi-wrap/table.pl ): www- iepm.slac.stanford.edu/cgi-wrap/table.pl Select metric, region aggregations Drill down to time series, download data Graphs –Select source(s)/destination(s), metric, time window, SQL selects, graph type

20 Publish information #!/usr/bin/perl use SOAP::Lite; my $characteristic = SOAP::Lite -> service(‘ -> pathDelayOneWay("tt81.ripe.net:tt28.ripe.net”); print $characteristic->{NetworkTestTool}->{toolName},"\n"; print $characteristic->{NetworkPathDelayStatistics}->{value},"\n"; wrap/pingtable.pl => tabular reports, also download datawww.slac.stanford.edu/cgi- wrap/pingtable.pl Data accessible from MonaLisa Implementing web services access prototype –Includes: PingER, IEPM-BE, RIPE-tt, I2 E2Epi OWAMP –Use GGF/NMWG schema/profile, e.g. path.delay.roundTrip

21 Loss to world from US 2001Dec-2003  In 2001 <20% of the world’s population had Good or Acceptable Loss performance Loss Rate < 0.1 to 1 % 1 to 2.5 % 1 to 2.5 % 2.5 to 5 % 2.5 to 5 % 5 to 12 % 5 to 12 % > 12 % > 12 %  BUT by December 2003 It had improved to 77%

22 Rate Limiting RTTLoss 2 hosts at same site see sudden step- like increase in loss from < 1% to % at similar time boromir.nask.waw.pl gollum.nask.pl Another host in Poland sees no problems, i.e. helps to have another nearby host RTT Loss Similar effects for Greek (uoa.gr), Bulgarian (acad.bg), Kazakhstan (president.kz), Moldovan (asm.md) and Turkish (metud.edu.tr) sites If no step function or nearby host may not notice, so also compare synack vs ping Can ping routers along path to see where onset occurs At any given time, about 5% of monitored hosts are doing this, most in developing countries. Recently (August 2003) seen an increase in ping rate limiting RTTLoss boromir.nask.waw.pl gollum.nask.pl RTT Loss

23 Rate Limiting Moldova cni.md lises.asm.md RTTLoss Moldova Bulgaria

24 Variability RegionCountries# Africa Ghana, Namibia, Nigeria, Namibia, S. Africa, Uganda 6 C Asia Kazakhstan, Kyrghzstan, Mongolia, Tajikistan, Turkmenistan, Uzbekistan 9 S Asia Bangladesh, India, Indonesia, Malaysia, Pakistan, Thailand, (Vietnam) 16 M East Egypt, Iran, Israel, Jordan, Saudi Arabia, Turkey 10 Caucasus Armenia, Azerbaijan, Georgia 5 S America Argentina, Brazil, Columbia, Chile, Peru, Uruguay, Venezuela 13 China China including Hong Kong 5 Russia 5 C America Costa Rica, Cuba, Guatemala, Mexico 4 SE Europe (Albania), Bulgaria, Croatia, Macedonia, Moldova, Romania, Serbia/Montenegro, Slovenia 13

25 Africa Hosts in: Ife-Ife/Nigeria, Accra/Ghana, Kampala/Uganda, Windhoek/Namibia, UCT/ZA, Johannesburg/ZA, Musselbay/ZA Carriers: –GH uses UUNET/Satworks, NA uses UUNET/xantic, NG uses TELIANET/NewSkies, UG uses Level(3)/globalconnex –ZA varies from site to site: UUNET/ALTERNET, C&W Telecom S. Africa, CAIS telcom S. Africa UG, NA, NG, GH use satellites (> 600ms) ZA uses landlines

26 Africa RTT Monitored from N. America & Europe –Depends on remote site (not monitoring site) –Satellite for all except S. Africa –Ghana problems

27 West Africa Ghana very poor performance –Sudden increase on August 18th –Not rate limiting according to synack –Sometimes get down to a few % –Route ESnet-UUNET/ALTER.NET –Losses appear on last 2 hops in Ghana Nigeria better –Route via TELIANET/newskies

28 Africa Derived Throughput S. Africa (UCT) best, followed by Uganda, Nigeria and Ghana Throughput to Nigeria site == home DSL/cable Throughput to Ghana site === modem dialup

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30 NREN Core Network Size (Mbps-km) 10M 1M 100K 10K 1K Leading Advanced In transition Source: From slide prepared by Harvey Newman, presented by David Williams ICFA/SCIC talk on Serenate report. Data from the TERENA Compendium Lagging Derived throughput~MSS/(RTT*sqrt(loss)) Europe Netherlands Turkey Belgium

31 Loss Comparisons with Development (UNDP) Even weaker with education & literacy Weak correlation with Human Development or GDP

32 Digital Access Index DAI (from ITU 2002) includes: –Availability of infrastructure –Affordability of access –Education level –Quality of ICT services –Internet usage Top DAI countries Good positive correlation between throughput and DAI Care needed with shorter RTTs

33 Network Readiness Index: How Ready to Use Modern ICTs [*]? Market Infrastructure Political/Regulatory Individual Readiness Gov’t Readiness Business Readiness Individual Usage Gov’t Usage Business Usage (FI) (SG) (US) (IC) (SG) (US) (SG) (US) (FI) (DE ) (KR) ( ): Which Country is First From the Global Information Technology Report. See Network Readiness Index Environment Readiness Usage Slide prepared by Harvey Newman, Caltech for ICFA

34 Network Readiness NRI from Center for International Development, Harvard U. Using derived throughput ~ MSS / (RTT * sqrt(loss)) –Fit to exponential is better Internet for all focus A&R focus NRI Top 14 Finland 5.92 US 5.79 Singapore 5.74 Sweden 5.58 Iceland 5.51 Canada 5.44 UK5.35 Denmark 5.33 Taiwan5.31 Germany5.29 Netherlands 5.28 Israel 5.22 Switzerland 5.18 Korea 5.10

35 Technology Achievement Index (TAI) TAI captures how well a country is creating and diffusing technology and building a human skills base. TAI from UNDP hdr.undp.org/reports/global/2001/en/pdf/techindex.pdf hdr.undp.org/reports/global/2001/en/pdf/techindex.pdf TAI top 12 Finland US Sweden Japan0.698 Korea Rep. of Netherlands0.630 UK Canada0.589 Australia Singapore0.585 Germany0.583 Norway0.579 US & Canada off-scale

36 Futures Get >= 2 hosts/country Better/quicker detection of rate limiting Have 4 students at GATech rewriting parts of PingER to improve (reduce effort required for) day to day management and improve portability Submitting a proposal to IDRC for monitoring Africa and adding a measurement host in Nigeria Need better automated tools to produce graphs like in this presentation.

monitoring sites in 13 countries –Plan to add ICTP Trieste if funded –Other projects used toolkit, e.g. XIWT, PPCNG/EDG, IAEA … SLAC with help from FNAL Digital Divide collaboration (MOU) with ICTP, Trieste –eJDS –We are requesting an IDRC grant for eJDS and PingER Need funding for coming year (DoE funding ended): –Tasks: (0.5 FTE) ongoing maintain data collection, explain needs, reopen connections, open firewall blocks, find replacement hosts, make limited special analyses, prepare & make presentations, respond to questions (+ 0.5 FTE) extend the code for new environment (more countries, more data collections), fix known non-critical bugs, improve visualization, automate some of reports generated by hand today, find new country site contacts, add route histories and visualization, automate alarms, detect rate limiting earlier, update web site for better navigation, add more DD monitoring sites/countries, improve code portability, understand regions better ICFA: show importance to policy makers, funding agencies, identify sympathetic contacts at agencies, get support Collaborations & Funding