Networking For Developers
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Assumption • You’re not a “networking guy” and you don’t want to be • Networking infrastructure is configured properly – Packets go where they’re told to go
Steve Evans – scevanscg.com
Ports • TCP (Transmission Control Protocol) – State, Handshake, Confirmed
• UDP (User Datagram Protocol) – Stateless, No Confirmation
• Numbers – 1-1023 Well Known • 80 = HTTP, 443 = HTTPS, 25 = SMTP, 53 = DNS
– 1024-49151 Registered • http://www.iana.org/assignments/port-numbers
– 49152-65535 Dynamic Steve Evans – scevanscg.com
Ports • DEMO – Telnet – NMAP (http://nmap.org/ )
Steve Evans – scevanscg.com
Sniffing Packets • DEMO – Wireshark (http://wireshark.org/ ) • Read web page • Send Email
Steve Evans – scevanscg.com
Name Resolution
server1.comp.com?
10.0.0.15
Steve Evans – scevanscg.com
blog.scevanscg. com? 67 .20 5.5 0
.11
scevanscg.com ?
.c o m ?
0
blog.scevanscg.com?
67.205.50.110
Steve Evans – scevanscg.com
www?
Does not exist
www.comp.com?
10.0.0.16 Suffix Search List: comp.com
Steve Evans – scevanscg.com
Steve Evans – scevanscg.com
Ports • TCP (Transmission Control Protocol) – State, Handshake, Confirmed
• UDP (User Datagram Protocol) – Stateless, No Confirmation
• Numbers – 1-1023 Well Known • 80 = HTTP, 443 = HTTPS, 25 = SMTP, 53 = DNS
– 1024-49151 Registered • http://www.iana.org/assignments/port-numbers
– 49152-65535 Dynamic Steve Evans – scevanscg.com
Ports • DEMO – Telnet – NMAP (http://nmap.org/ )
Steve Evans – scevanscg.com
Sniffing Packets • DEMO – Wireshark (http://wireshark.org/ ) • Read web page • Send Email
Steve Evans – scevanscg.com
Name Resolution
server1.comp.com?
10.0.0.15
Steve Evans – scevanscg.com
blog.scevanscg. com? 67 .20 5.5 0
.11
scevanscg.com ?
.c o m ?
0
blog.scevanscg.com?
67.205.50.110
Steve Evans – scevanscg.com
www?
Does not exist
www.comp.com?
10.0.0.16 Suffix Search List: comp.com
Steve Evans – scevanscg.com
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