Internet machines
Définition : Server and clients
Définition : In the middle : routers
Routers are computers that transport requests from client to server and back answer from server to client.
Exemple :
The client send its request to the router it is connected to (example : the box).
If the router knows the server (example : it is in the same network), it delivers the message (the request).
If not, it delivers the message to another router known to be nearer the server.
The next router does the same.
One last router finally knows the server and delivers the message.
The same process is used for the answer.
Exemple : traceroute
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traceroute www.icann.org.
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traceroute to www.icann.org. (192.0.32.7), 30 hops max, 60 byte packets
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1 * * *
3
2 10.24.0.1 (10.24.0.1) 72.344 ms 72.283 ms 72.305 ms
4
3 192.168.253.30 (192.168.253.30) 72.306 ms 72.302 ms 77.540 ms
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4 192.168.255.6 (192.168.255.6) 77.569 ms 77.566 ms 78.655 ms
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5 ppp18-metz.isdnet.net (194.149.166.145) 78.681 ms 80.408 ms 80.434 ms
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6 ppp6-metz.isdnet.net (194.149.166.133) 78.654 ms 38.479 ms 38.291 ms
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7 * * *
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8 be4204.ccr32.par04.atlas.cogentco.com (149.11.115.13) 42.493 ms 42.424 ms 42.369 ms
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9 be2067.ccr31.par04.atlas.cogentco.com (130.117.3.33) 41.388 ms 41.284 ms 41.180 ms
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10 ae-29.r04.parsfr01.fr.bb.gin.ntt.net (129.250.8.125) 39.545 ms 39.478 ms 39.708 ms
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11 ae-23.r24.amstnl02.nl.bb.gin.ntt.net (129.250.4.137) 49.371 ms 40.029 ms 42.071 ms
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12 ae-3.r25.amstnl02.nl.bb.gin.ntt.net (129.250.4.69) 39.909 ms 46.701 ms 49.333 ms
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13 ae-5.r23.asbnva02.us.bb.gin.ntt.net (129.250.6.162) 139.280 ms 145.858 ms 140.580 ms
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14 ae-0.r22.asbnva02.us.bb.gin.ntt.net (129.250.3.84) 126.531 ms 123.791 ms 115.589 ms
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15 ae-5.r23.lsanca07.us.bb.gin.ntt.net (129.250.3.189) 185.790 ms 177.418 ms 183.428 ms
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16 ae-5.r01.lsanca20.us.bb.gin.ntt.net (129.250.6.49) 180.727 ms 204.185 ms 201.918 ms
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17 ge-100-0-0-16.r01.lsanca20.us.ce.gin.ntt.net (204.1.254.150) 199.037 ms 186.855 ms 185.762 ms
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18 www.icann.org (192.0.32.7) 187.313 ms 239.217 ms 232.851 ms
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