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The Internet is a Series of TubesA Practical Understanding of the Internet
Who are you?
John Hobbs
- Developer at What Cheer- @jmhobbs- https://github.com/jmhobbs- http://velvetcache.org/
The Internet is a Series of Tubes
This is the Internet
The Internet is a Series of Tubes
The Internet is a Series of Tubes
You What Cheer
?
This is Your Computer
72.113.10.126
(sort of)
The Internet is a Series of Tubes
The Internet is a Series of Tubes
You(72.113.10.126)
whatcheer.com(???.???.??.???)
?
Connecting Computersjmhobbs@Cordelia:~$ ping -c 3 192.168.1.2PING 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 ms64 bytes from 192.168.1.2: icmp_req=2 ttl=64 time=2.58 ms64 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 2002msrtt min/avg/max/mdev = 2.584/3.390/4.985/1.128 msjmhobbs@Cordelia:~$
The Internet is a Series of Tubes
192.168.1.4(Me)
192.168.1.2(Alex)
Translating Your Desires
The Internet is a Series of Tubes
The Internet is a Series of Tubes
DNS!
Translating Your Desires
The Internet is a Series of Tubes
DNSDomain Name System
google.com 74.125.73.106
(Name Server)
Something Useful?
Some DNS Records Types
A – Map an domain to an IP addressgoogle.com => 74.125.73.105
CNAME – Map a domain to another domaincatz.whatcheer.com => cats.whatcheer.com
MX – Map a domain to it's (inbound) mail servers10 mail.google.com
TXT – Arbitrary human readable notesOh hai.
The Internet is a Series of Tubes
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 300whatcheer.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 69.20.95.4dns2.stabletransit.com. 300 IN A 65.61.188.4
...snip...
jmhobbs@Cordelia:~$
The Internet is a Series of Tubes
The Internet is a Series of Tubes
You(72.113.10.126)
whatcheer.com(???.???.??.???)
?
DNS Server
The Internet is a Series of Tubes
You(72.113.10.126)
whatcheer.com(???.???.??.???)
?
DNS Server
whatcheer.com?
98.129.229.176
The Internet is a Series of Tubes
You(72.113.10.126)
whatcheer.com(98.129.229.176)
DNS Server
Something Useful?jmhobbs@Cordelia:~$ ping -c 1 whatcheer.comPING whatcheer.com (98.129.229.176) 56(84) bytes of data.<snip>jmhobbs@Cordelia:~$
The Internet is a Series of Tubes
whatcheer.com 127.0.0.1
jmhobbs@Cordelia:~$ ping -c 1 whatcheer.comPING 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
You(72.113.10.126)
whatcheer.com(98.129.229.176)
DNS Server
The Internet is a Series of Tubes
You(72.113.10.126)
whatcheer.com(127.0.0.1)
DNS Server
The Internet is a Series of Tubes
You(72.113.10.126)
whatcheer.com(98.129.229.176)
DNS Server
Sweet HTTP
The Internet is a Series of Tubes
jmhobbs@Cordelia:~$ telnet whatcheer.com 80Trying 98.129.229.176...Connected to whatcheer.com.Escape character is '^]'.GET / HTTP/1.1Host: whatcheer.comUser-Agent: John Hobbs (like Gecko)
HTTP/1.1 200 OKServer: Apache/2.2Content-Type: text/html; charset=UTF-8Date: Fri, 02 Sep 2011 18:53:13 GMTTransfer-Encoding: chunkedConnection: Keep-AliveSet-Cookie: X-Mapping-dghlffcp=3CB0F424661D80A0FCF7A43668C564F3; path=/
1ff3<!DOCTYPE html> <html lang="en"> ...snip...</html>0
jmhobbs@Cordelia:~$
The Internet is a Series of Tubes
Discussion
Questions?Comments?
The Internet is a Series of Tubes
