Active Network Performance Testing

NASA EOSNASA EOSActive Network Performance TestingActive Network Performance Testing

Andy Germain

Swales Aerospace

23 August 2001

[email protected]

301-902-4352

23 August 2001 Andy Germain 2


Created in 1984 39 organizations involved Goals:

– To optimize benefits of space-borne Earth observations– To serve as focal point for international coordination of such

observations– To exchange policy and technical information to encourage

complementarily among space systems

CEOS OverviewCEOS Overview

ASI (Italy) BNSC (UK)CAST (China)CSA (Canada)CNES (France)CSIRO (Australia)DLR (Germany)EC (Europe)ESA (Europe)EUMETSAT (Eur.)INPE (Brazil)

ISRO (India)NASDA (Japan)NASA (US)NOAA (US)NRSCC (China)NSAU (Ukraine)STA/NASDA (Japan)Roshydromet (Russia)RSA (Russia)SNSB (Sweden)

MEMBERS ASSOCIATES

CRI (N.Zealand) CCRS (Canada) GCOSGOOSGTOSICSUIGBPIOCISPRS

NSC (Norway) OSTC (Belgium) SAC/CSIR (S.A.)UN-ESCAPUN-FAOUN-OOSAUNEPWCRPWMO


COMMITTEE ON EARTH

OBSERVATION SATELLITES

WORKING GROUP ON INFORMATION

SYSTEMS AND SERVICES (WGISS)

TERRAIN MAPPING MICROWAVE SENSORS SAR CALIBRATIONOPTICAL SENSORS

NETWORK ACCESS

DATA LAND SURFACE PARAMETERVALIDATION

CEOS OrganizationCEOS Organization

WORKING GROUP ON CALIBRATION AND

VALIDATION (CAL/VAL)


IGOS- Partners

CEOS Science Themes

WGISS GTOS IGBP

GOFC

NAKODO

WTF-G

Others...

Sub-groups

WGCV(Matchmaker)(Matchmaker)

Goals:• To provide comprehensive framework to harmonize interest of major space-based and in-situ systems for Earth observation• To improve observing capacity and deliver observations in a cost-effective and timely fashion to users and policy makers

Integrated Global Integrated Global Observation StrategyObservation Strategy


CEOS WGISS CEOS WGISS Access SubgroupAccess Subgroup

Develops methods for integrated access to CEOS members’ data:– World Wide Web Access– CEOS information resources– International Directory Network (IDN)– Catalog Interoperability (CINTEX)

Catalog Interoperability protocol (Z39.50)

– Data and Information Access Link (DIAL)– WGISS Test Facility


Access Subgroup: Access Subgroup: World Wide Web Task Team World Wide Web Task Team

Objectives:– To investigate and coordinate the implementation

of WWW access to international Earth observation catalogue systems and data access systems.

– To perform outreach to external organizations capable of influencing WWW technology evolution

Simple HTTP Based Search Protocol– Low level http mechanism for remotely searching

catalogs and databases– Standardize the interface for space, time & free

text searching – Low buy in cost for suppliers– Protocols in use at CCRS and CEO, unification

details agreed upon


Information ManagementInformation ManagementData HierarchyData Hierarchy

Directory– provides concise high-level information about data sets.– GCMD, CEOS IDN

Guide– provides detailed descriptions about data sets, platforms,

sensors, projects, and data centers Inventory (Catalog)

– descriptions of specific observations or collections of observations of data (granules) that are available for request from a data archive.

– Information Management System (IMS) Browse Products

– reduced resolution images as an aid to data selection Data Products (Granules)

– via media (custom or standard) or network

9Andy Germain23 August 2001

CEOS International CEOS International Directory NetworkDirectory Network

10Andy Germain23 August 2001

CEOS WGISS CEOS WGISS Network SubgroupNetwork Subgroup

Resource planning and management for CEOSnet, a virtual private network

Performance measurement of network links

Network Security (CEOS context) Collaboration on Next Generation

networks and international prototyping Network support for Access Subgroup

projects and CEOS demos


EOS DAAC

NASA Nodes

SCFsQA Other

Key:

ORST

UCSB

ArizLANL

Wisc

Miami

SUNY-SB

BU

GSFC

LaRC

EDC

MSFC, NSSTC

NCAR

Mont

JPL

Toronto

Colo St.

Niagara

ASF

Chicago

Other Nodes

SLAC

NSIDC

NMEX

CCRS

UVA

UMD

GPNNGDC,NOAA

USF

RSS

EOS Performance Test SitesEOS Performance Test Sites

Texas

UCSD

Wash

Mich

NOAA

Ohio


EOSDIS MissionPartner

CEOSPI: QA/IST

EOS International Test SitesEOS International Test Sites

GSFC

CCRS

JPL NASDA (ADEOS, TRMM, Aura, Aqua)

CSIRO

ESRIN

INPE(Aqua),IDN

CONAE

IRE-RAS

Israel

ASF

NSIDC

EDC

LaRC

MITI (Terra)

CAO (SAGE III)

RAL, OXFORD (Aura)

Toronto(Terra)

UCL(Terra)

JRC

UNEP

UNEP

UNEP

AIT,RFD,GISTDA UNEP

UNEP

KNMI (Aura)


UNEP

CSIRO(Australia)

DFN

JARING(Malaysia)

Miam

i

DC

Geneva NYC

Abilene

STARTAP

CA*NET3

ATT.net

CCRS

CMA(China)

Optus

Cable &Wireless

CONAE(Argentina)

Rostelecom

SFO

Chicago

UUNet

START

(Thailand)

SURFnet

JANET

PAO(Philipines)

UCL

NASDA

IMNet

KNMI

DANTE(TEN-155)

ILANIsrael

JRC

GARRMilan

DFN DLR

ESRIN

Commodity ISPs

(BBNPlanet, Verio, etc.)

MIPTMoscow

IRE-RAS

Qwest

EUmetsat

Swisscom

NairobiBangkokSJCRBeijing

Norway

TelintAr

ANSP INPE(Brazil)

NISN

MIRNET

TransPAC

(APAN)

WIDE

Teleglobe

UMD

Oxford

RAL

MAFF

CAO

GPN

EDCMSFC/UAH

MichNet

MSU

CNES

FranceTelecom

Sprintlink (P

aris)

MAE-EWash DC

vBNS+

AIT

NorduNet

X

X

NY

UNInet

GSFC

LaRCMAX

GISTDA

Virtual CEOSnet - April 2001Virtual CEOSnet - April 2001

UNINET


Test OverviewTest Overview End-to-end user level test

– “Active” testing– little or no visibility into network internals

Purposes– EOS: assess whether networks as implemented meet

EOS requirements– CEOS: assess whether networks can support intended

applications– Resolve user complaints:

Network problems -- or somewhere else??

– Determine bottlenecks -- seek routing alternatives– Provide a basis for allocation of additional resources


Test Process Test Process Test script runs hourly to each site: Traceroute (1 way)

– Number of hops -- route stability --> Hops Chart

Pings – 100 pings prior to thruput test or 100/300 during– Round Trip Time --> RTT Chart– Packet Loss --> Packet Loss Chart

TCP Throughput – TCPwatch, Iperf, or FTP --> Thruput Chart– requires cooperating client at destination– TCPwatch / Iperf keeps send buffer full for 30 Seconds– Netstat -> packets retransmitted (if pings blocked)


On line resultsOn line results Updated Daily

– http://corn.eos.nasa.gov/networks– "Network Health Statistics"

GSFC Sites EOS Sites EMSNet Sites CEOS Sites Other sites

– Charts: All sources to specified destination Thruput, RTT, Packet Loss, Hop Count

– Weekly: 24 measurements per day from each source– 60 day: Daily Average– Yearly (RSN)

http://corn.eos.nasa.gov/networks








Technical NotesTechnical Notes Each data source plotted in the same color on

all charts Concurrent Pings:

– GSFC, LaRC, EDC DAACs (300), GSFC-Destr (100)

No Pings: – MODIS sources, a few destinations– Calculate Retransmission % instead of packet loss %

FTP: – Gila to international destinations,– CAO to LaRC

Window size typically set to be 2 x delay * BW– No control of window size on FTP, Solaris, Linux sources

Business

Active Network Performance Testing