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NASA EOSNASA EOSActive Network Performance TestingActive Network Performance Testing
Andy Germain
Swales Aerospace
23 August 2001
Andy.Germain@gsfc.nasa.gov
301-902-4352
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23 August 2001 Andy Germain 3
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
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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)
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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
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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
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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
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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
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CEOS International CEOS International Directory NetworkDirectory Network
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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
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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
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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)
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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
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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
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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)
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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)
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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
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