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Ports DEMO – Telnet – NMAP (http://nmap.org/ )http://nmap.org/ Steve Evans – scevanscg.com
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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
Sniffing Packets
• DEMO– Wireshark (http://wireshark.org/ )• Read web page• Send Email
Steve Evans – scevanscg.com
ns1.comp.com
server1.comp.com?
10.0.0.15
Name Resolution
Steve Evans – scevanscg.com
ns1.comp.com
blog.scevanscg.com?
67.205.50.110
Root NS
.com
?
.com NS
scevanscg.com?
scevanscg.com NS
blog.scevanscg.com?
67.205.50.110
Steve Evans – scevanscg.com
ns1.comp.com
www?
10.0.0.16
Suffix Search List: comp.com scevanscg.com
Does not exist
www.comp.com?
Steve Evans – scevanscg.com
