WisconsinBroadcaster’sAssociation -

Transferring FilesUsing the Internet

WisconsinBroadcaster’sAssociation -

Transferring FilesUsing the Internet

July 14, 1999

Agenda

How does the Internet connect computers?

What file transfer options are available?

How long should file transfers take?

The Internet

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

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

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

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

File Transfer Options E-Mail Attachments FTP - File Transfer Protocol TFTP - Trivial File Transfer NFS - Network File System

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

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

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

FTP Transfer Disks can fill Usually requires a dedicated FTP

server Less places for things to go

wrong More “production” orientated

TFTP Transfer Trivial File Transfer Protocol Like FTP except lacking some

features Usually used for engineering

purposes Client and Server commonly

available

NFS Transfer Network File System Generally a Data Center

application Relatively slow Requires specialized knowledge

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

Reality Speed of disk access Speed of network access Congestion of network - dropped

packets Number of hops Distance traveled

SummarySummary

Today, nothing is guaranteed High-speed access is key Availability is important