wisconsin broadcaster’s association - transferring files using the internet july 14, 1999
TRANSCRIPT
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WisconsinBroadcaster’sAssociation -
Transferring FilesUsing the Internet
WisconsinBroadcaster’sAssociation -
Transferring FilesUsing the Internet
July 14, 1999
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Agenda
How does the Internet connect computers?
What file transfer options are available?
How long should file transfers take?
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The Internet
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Trace Route - West Coast glacier> traceroute www.cisco.com traceroute to cio-sys.cisco.com (192.31.7.130), 30 hops max, 40 byte packets 1 hood.binc.net (208.155.53.129) 1.171 ms 0.668 ms 0.502 ms 2 borderx1-hssi4-0.KansasCity.cw.net (204.70.197.109) 39.826 ms 65.262 ms 29.2 ms 3 core2-fddi-0.KansasCity.cw.net (204.70.197.49) 29.33 ms 29.084 ms 30.175 ms 4 core5.WillowSprings.cw.net (204.70.4.97) 39.301 ms 38.627 ms 78.089 ms 5 206.157.77.202 (206.157.77.202) 39.48 ms 53.901 ms 47.036 ms 6 p2-0.chicago1-nbr1.bbnplanet.net (4.0.5.90) 65.324 ms 58.153 ms 64.021 ms 7 p2-1.paloalto-nbr1.bbnplanet.net (4.0.3.166) 92.66 ms 87.199 ms 89.18 ms 8 p1-0.paloalto-nbr2.bbnplanet.net (4.0.5.66) 98.269 ms 94.211 ms 96.705 ms 9 p0-0-0.paloalto-cr18.bbnplanet.net (4.0.3.86) 93.012 ms 97.153 ms 97.247 ms 10 h1-0.cisco.bbnplanet.net (4.1.142.238) 100.333 ms 95.248 ms 168.087 ms 11 sty.cisco.com (192.31.7.39) 97.447 ms 138.212 ms 99.984 ms
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Trace Route - Local glacier> traceroute www.fullfeed.com traceroute to www.fullfeed.com (199.184.184.2), 30 hops max, 40 byte packets 1 hood.binc.net (208.155.53.129) 0.923 ms 0.528 ms 0.489 ms 2 borderx1-hssi4-0.KansasCity.cw.net (204.70.197.109) 73.395 ms 89.037 ms 122.573 ms 3 core2-fddi-0.KansasCity.cw.net (204.70.197.49) 124.976 ms 35.189 ms 29.416 ms 4 core9.Chicago.cw.net (204.70.9.105) 38.094 ms 86.538 ms 40.209 ms 5 204.70.10.94 (204.70.10.94) 41.252 ms 38.312 ms 50.9 ms 6 ord1-core3-fa4-1-0.atlas.digex.net (165.117.55.11) 38.578 ms 39.22 ms 38.875 ms 7 dca1-core6-s1-1-0.atlas.digex.net (165.117.56.153) 60.079 ms 62.165 ms 65.447 ms 8 dca1-core10-pos1-3.atlas.digex.net (165.117.59.197) 119.339 ms 66.016 ms 82.721 ms 9 ric2-core1-s4-0-0.atlas.digex.net (165.117.50.70) 159.386 ms 69.805 ms 64.346 ms 10 rdu2-core2-h1-0-0.atlas.digex.net (165.117.53.22) 140.809 ms 124.645 ms 138.938 ms 11 rdu2-core1-fa10-0-0.atlas.digex.net (165.117.61.49) 164.267 ms 135.732 ms 135.187 ms 12 * 209.48.179.126 (209.48.179.126) 194.346 ms 226.159 ms 13 www.fullfeed.com (199.184.184.2) 213.423 ms 188.941 ms 201.149 ms
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Network Performance
180,000 miles/s - It’s not just a good idea, it’s the law
20 ms for a R/T from Madison to California
That doesn’t include other overhead
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Internet Connection Physical proximity is not as
important as “Internet” proximity Each router or “hop” adds
latency Lot’s of places for things to go
wrong - most out of your control The bandwidth is shared
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File Transfer Options E-Mail Attachments FTP - File Transfer Protocol TFTP - Trivial File Transfer NFS - Network File System
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E-Mail Transfer
Ethernet
IBM C om patib le
IBM C om patib le
M ail S erver
Ethernet
IBM C om patib le
IBM C om patib le
M ail S erver
In terne t
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E-Mail Transfer Disks on mail servers can fill Mail servers can go down Connections can be slow/down Mail is readily intercepted Mail stops in many places Simple and readily available
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FTP Transfer
Ethernet
IBM C om patib le
IBM C om patib le
FTP S erver
Ethernet
IBM C om patib le
In te rne t
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FTP Transfer Disks can fill Usually requires a dedicated FTP
server Less places for things to go
wrong More “production” orientated
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TFTP Transfer Trivial File Transfer Protocol Like FTP except lacking some
features Usually used for engineering
purposes Client and Server commonly
available
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NFS Transfer Network File System Generally a Data Center
application Relatively slow Requires specialized knowledge
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How Long - Ideal Conditions
Assume 1 MB file (About a floppy)
28.8 kbs Modem 4.62 minutes
56 kbs Mode 2.38 minutes
126 kbs ISDN 1.05 minutes
800 kbs xDSL 10.2 seconds
T1 5.18 seconds
DS3 0.17 seconds
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Reality Speed of disk access Speed of network access Congestion of network - dropped
packets Number of hops Distance traveled
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SummarySummary
Today, nothing is guaranteed High-speed access is key Availability is important