2. QuickTimeª and a
mpeg4 decompressor
are needed to see this picture.
3. Who cares?
• Todays Internet is Communication,
coordination, information and pleasure
• How many of you would be living here if
there was no Internet?
4. Getting there
• Free is good, Internet Para todos
• http://www.internetparatodos.gob.pa
• Not in Boquete, but in David
• The New Library, Free Wifi
5. Your home
• Cable Onda
• Cable and Wireless
• Wireless Radio
• Mobile Net
• Planet Telecom
• Internet Activo
6. It’s all Plumbing
QuickTimeª and a
mpeg4 decompressor
are needed to see this picture.
8. Data Flows
• clean pipes, big pipes & good fittings
• valves need to route correctly
• the bits and bytes need to flow
9. Addresses
• The Internet uses IP (Internet Protocol)
• 4 Bytes of 8 bits, example : 157.166.255.19
• Binary
10011101.10100110.11111111.00010011
• or decimal 2644967187
• or using DNS, this is CNN.COM
10. DNS
• Domain Name Services
• the user friendly way to find things
• When DNS fails IP addresses will work
11. DNS the Movie
QuickTimeª and a
mpeg4 decompressor
are needed to see this picture.
13. Ping
• Ping is the most basic tool to see if you are
connected
• Command: Ping www.cnn.com or
• Ping 157.166.255.19
• Ping will send a series of packets to CNN
and see how many arrive and how long it
takes.
14. Reading Ping
• Ping has started…
PING www.prensa.com (70.33.215.92): 56 data bytes
64 bytes from 70.33.215.92: icmp_seq=0 ttl=37 time=192.454 ms
64 bytes from 70.33.215.92: icmp_seq=1 ttl=37 time=543.085 ms
64 bytes from 70.33.215.92: icmp_seq=2 ttl=37 time=194.372 ms
64 bytes from 70.33.215.92: icmp_seq=3 ttl=37 time=186.664 ms
64 bytes from 70.33.215.92: icmp_seq=4 ttl=37 time=192.023 ms
64 bytes from 70.33.215.92: icmp_seq=5 ttl=37 time=199.200 ms
64 bytes from 70.33.215.92: icmp_seq=6 ttl=37 time=216.314 ms
The Internet Control Message Protocol (ICMP) is one of the core protocols of the Internet Protocol Suite. It is chiefly used by the
operating systems of networked computers to send error messages indicating, for example, that a requested service is not
available or that a host or router could not be reached
Time to live (TTL) is a mechanism that limits the lifespan of data in a computer or network.
The TTL field is set by the sender of the datagram, and reduced by every router on the route to its destination. If the TTL field reaches
zero before the datagram arrives at its destination, then the datagram is discarded and an ICMP error datagram is sent back to
the sender. The purpose of the TTL field is to avoid a situation in which an undeliverable datagram keeps circulating on an
Internet system, and such a system eventually becoming swamped by such "immortals"
15. • Where is the data going?
• Traceroute has started…
Trace Route
traceroute: Warning: prensa.com has multiple addresses; using 70.33.215.92
traceroute to prensa.com (70.33.215.92), 64 hops max, 72 byte packets
1 192.168.100.1 (192.168.100.1) 3.326 ms 1.287 ms 7.789 ms
2 172.18.1.1 (172.18.1.1) 3.239 ms 6.914 ms 2.638 ms
3 172.18.4.2 (172.18.4.2) 12.983 ms 7.148 ms 5.395 ms
4 172.16.40.4 (172.16.40.4) 8.973 ms 10.388 ms 22.286 ms
5 172.18.254.2 (172.18.254.2) 25.073 ms 24.256 ms 25.792 ms
6 172.18.252.1 (172.18.252.1) 27.169 ms 27.294 ms 26.896 ms
7 172.18.250.1 (172.18.250.1) 27.890 ms 21.755 ms 19.871 ms
8 172.18.249.1 (172.18.249.1) 34.698 ms 19.131 ms 18.981 ms
9 172.18.248.2 (172.18.248.2) 12.875 ms 12.854 ms 18.891 ms
10 10.8.128.117 (10.8.128.117) 20.653 ms 27.455 ms 18.190 ms
11 10.9.67.173 (10.9.67.173) 19.693 ms 22.080 ms 35.225 ms
12 10.255.0.74 (10.255.0.74) 41.143 ms 29.987 ms 36.154 ms
13 ge-0-0-0.bal1-int-1.jf1-agr-1.cwpanama.net (201.224.254.237) 34.489 ms 32.623 ms 117.649 ms
14 so-6-0-1.mia11.ip4.tinet.net (77.67.82.201) 98.414 ms 90.499 ms 102.931 ms
15 xe-0-3-0.van10.ip4.tinet.net (89.149.182.238) 205.199 ms 208.110 ms 229.033 ms
