Page 1
Jakim cudem działa Internet?
Grzegorz Nosek,
Page 2
Layer 7 co ja chcę? DNS gdzie mam iść? IP jak tam trafić? BGP dlaczego tamtędy?
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HTTP
daj mi stronę www.wp.pl
ok, tak wygląda
… i to zdjęcie
ok, proszę bardzowww.wp.pl
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SMTP
kto tam?
to ja, chcę wysłać maila
ok, dawaj
„kochana ciociu…”smtp.megiteam.pl
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IMAP
kto tam?
to ja, mam nową pocztę?
tak, jednego maila
to daj
„kochana ciociu…”
mail.google.com
Page 6
www.wp.pl
smtp.megiteam.pl
mail.google.com
Page 7
212.77.100.101
31.186.83.105
74.125.136.17
192.168.1.2
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31.186.83.105smtp.megiteam.pl
?
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31.186.83.105smtp.megiteam.pl
DNS
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DNSroot
.com
.example.com.megiteam.pl .cact.us
smtp.megiteam.pl = 31.186.83.105 www.example.com = 93.184.216.34 cact.us = 98.124.198.1
.pl .us
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192.168.1.0/24
192.168.1.0/24
!0.0.0.0/0 -> 192.168.1.1
192.168.1.1
IP
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89.76.214.0/24192.168.1.0/24
89.76.214.1
192.168.1.0/24
89.76.214.0/24
0.0.0.0/0 -> 89.76.214.1
IP
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zupełnie losowy obrazek
Page 16
tracert -h 100 216.81.59.173
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ponad pół miliona sieci
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BGPWP
PLIX GTS
UPC NETIA
212.77.100.0/24
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WP
PLIX GTS
UPC NETIA
WP GTS -> WP
WP PLIX -> WP
PLIX -> WP GTS -> WP
PLIX -> WP GTS -> WP
BGP
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WP
PLIX GTS
UPC NETIA
WP PLIX -> WP
PLIX -> WP GTS -> PLIX -> WP
PLIX -> WP GTS -> PLIX -> WP
BGP
X
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BGP
208.65.152.0/22
YouTube
208.65.153.0/24
Pakistan Telecom
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BGP
208.65.152.0/22
YouTube
208.65.153.0/24
Pakistan Telecom
Page 25
Do poczytania: http://research.dyn.com/2008/02/pakistan-hijacks-youtube-1/ http://research.dyn.com/2013/11/mitm-internet-hijacking/ http://research.dyn.com/2014/11/chinese-routing-errors-redirect-russian-traffic/ !!Ikonki (CC-BY-3.0): http://thenounproject.com/term/computer/6034/ http://thenounproject.com/term/server/80288/ http://thenounproject.com/term/router/65161/ http://thenounproject.com/term/thought-bubble/14958/ http://thenounproject.com/term/cloud/6853/ http://thenounproject.com/term/router/16624/