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# The Internet Is a Series of Tubes

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TCP/IP Exercises
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# The Internet Is a Series of Tubes

Stack 2011 Presentation

Stack 2011 Presentation

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### The Internet Is a Series of Tubes

1. 1. The Internet is a Series of Tubes A Practical Understanding of the Internet
2. 2. Who are you? John Hobbs - Developer at What Cheer - @jmhobbs - https://github.com/jmhobbs - http://velvetcache.org/ The Internet is a Series of Tubes
3. 3. This is the Internet The Internet is a Series of Tubes
4. 4. ? You What Cheer The Internet is a Series of Tubes
5. 5. This is Your Computer 72.113.10.126 (sort of) The Internet is a Series of Tubes
6. 6. ? You whatcheer.com (72.113.10.126) (???.???.??.???) The Internet is a Series of Tubes
7. 7. Connecting Computers jmhobbs@Cordelia:~\$ ping -c 3 192.168.1.2 PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data. 64 bytes from 192.168.1.2: icmp_req=1 ttl=64 time=4.98 ms 64 bytes from 192.168.1.2: icmp_req=2 ttl=64 time=2.58 ms 64 bytes from 192.168.1.2: icmp_req=3 ttl=64 time=2.60 ms --- 192.168.1.2 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 2.584/3.390/4.985/1.128 ms jmhobbs@Cordelia:~\$ 192.168.1.4 192.168.1.2 (Me) (Alex) The Internet is a Series of Tubes
8. 8. Translating Your Desires The Internet is a Series of Tubes
9. 9. DNS! The Internet is a Series of Tubes
10. 10. Translating Your Desires DNS Domain Name System google.com 74.125.73.106 (Name Server) The Internet is a Series of Tubes
11. 11. Something Useful? Some DNS Records Types A – Map an domain to an IP address google.com => 74.125.73.105 CNAME – Map a domain to another domain catz.whatcheer.com => cats.whatcheer.com MX – Map a domain to it's (inbound) mail servers 10 mail.google.com TXT – Arbitrary human readable notes Oh hai. The Internet is a Series of Tubes
12. 12. Something Useful? jmhobbs@Cordelia:~\$ dig @dns1.stabletransit.com whatcheer.com any ...snip... ;; ANSWER SECTION: whatcheer.com. 3600 IN SOA dns1.stabletransit.com. ipadmin.stabletransit.com. 1313437917 3600 300 1814400 300 whatcheer.com. 3600 IN MX 10 ASPMX.L.GOOGLE.com. whatcheer.com. 3600 IN MX 20 ALT1.ASPMX.L.GOOGLE.com. whatcheer.com. 3600 IN MX 20 ALT2.ASPMX.L.GOOGLE.com. whatcheer.com. 3600 IN MX 30 ASPMX2.GOOGLEMAIL.com. whatcheer.com. 3600 IN MX 30 ASPMX3.GOOGLEMAIL.com. whatcheer.com. 3600 IN MX 30 ASPMX4.GOOGLEMAIL.com. whatcheer.com. 3600 IN MX 30 ASPMX5.GOOGLEMAIL.com. whatcheer.com. 3600 IN NS dns1.stabletransit.com. whatcheer.com. 3600 IN NS dns2.stabletransit.com. whatcheer.com. 3600 IN A 98.129.229.176 ;; ADDITIONAL SECTION: dns1.stabletransit.com. 300 IN A 69.20.95.4 dns2.stabletransit.com. 300 IN A 65.61.188.4 ...snip... jmhobbs@Cordelia:~\$ The Internet is a Series of Tubes
13. 13. DNS Server ? You whatcheer.com (72.113.10.126) (???.???.??.???) The Internet is a Series of Tubes
14. 14. DNS Server whatcheer.com? 98.129.229.176 ? You whatcheer.com (72.113.10.126) (???.???.??.???) The Internet is a Series of Tubes
15. 15. DNS Server You whatcheer.com (72.113.10.126) (98.129.229.176) The Internet is a Series of Tubes
16. 16. Something Useful? jmhobbs@Cordelia:~\$ ping -c 1 whatcheer.com PING whatcheer.com (98.129.229.176) 56(84) bytes of data. <snip> jmhobbs@Cordelia:~\$ whatcheer.com 127.0.0.1 jmhobbs@Cordelia:~\$ ping -c 1 whatcheer.com PING whatcheer.com (127.0.0.1) 56(84) bytes of data. <snip> jmhobbs@Cordelia:~\$ http://detoursapp.com/ - Jerod Santo @sant0sk1 The Internet is a Series of Tubes
17. 17. DNS Server You whatcheer.com (72.113.10.126) (98.129.229.176) The Internet is a Series of Tubes
18. 18. DNS Server You whatcheer.com (72.113.10.126) (127.0.0.1) The Internet is a Series of Tubes
19. 19. DNS Server You whatcheer.com (72.113.10.126) (98.129.229.176) The Internet is a Series of Tubes
20. 20. Sweet HTTP jmhobbs@Cordelia:~\$ telnet whatcheer.com 80 Trying 98.129.229.176... Connected to whatcheer.com. Escape character is '^]'. GET / HTTP/1.1 Host: whatcheer.com User-Agent: John Hobbs (like Gecko) HTTP/1.1 200 OK Server: Apache/2.2 Content-Type: text/html; charset=UTF-8 Date: Fri, 02 Sep 2011 18:53:13 GMT Transfer-Encoding: chunked Connection: Keep-Alive Set-Cookie: X-Mapping-dghlffcp=3CB0F424661D80A0FCF7A43668C564F3; path=/ 1ff3 <!DOCTYPE html> <html lang="en"> ...snip... </html> 0 jmhobbs@Cordelia:~\$ The Internet is a Series of Tubes
21. 21. The Internet is a Series of Tubes
22. 22. Discussion Questions? Comments? The Internet is a Series of Tubes