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Transcript
Client User • Obtain IP Address • Gains ability to send IP traffic across network • User Types URL into Web Browser • Name Resolution Occurs • Data Routed Across Internet (Black Box) Network Server • Firewall Determines if Packet Allowed • TCP Stack Routes Packet to Process • Web Server Process’s Request • Web Page Routed Back to User Network IP Routing Every Client on Network IP Address Default Gateway DNS Servers Default Gateway Subnet Troubleshoot Slow Routes Client User • Obtain IP Address • Gains ability to send IP traffic across network • User Types URL into Web Browser • Name Resolution Occurs • Data Routed Across Internet (Black Box) Network Server • Firewall Determines if Packet Allowed • TCP Stack Routes Packet to Process • Web Server Process’s Request • Web Page Routed Back to User Network Name Resolution server1.serktools.com? 10.0.0.15 ns1.serktools.com blog.serktools.com? .com NS Root NS .com? serktools.com NS serktools.com? blog.serktools.com? 67.205.50.110 ns1.comp.com Client User • Obtain IP Address • Gains ability to send IP traffic across network • User Types URL into Web Browser • Name Resolution Occurs • Data Routed Across Internet (Black Box) Network Server • Firewall Determines if Packet Allowed • TCP Stack Routes Packet to Process • Web Server Process’s Request • Web Page Routed Back to User Network Client User • Obtain IP Address • Gains ability to send IP traffic across network • User Types URL into Web Browser • Name Resolution Occurs • Data Routed Across Internet (Black Box) Network Server • Firewall Determines if Packet Allowed • TCP Stack Routes Packet to Process • Web Server Process’s Request • Web Page Routed Back to User Network 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 Ports • DEMO – Telnet – NMAP (http://nmap.org/ ) Client User • Obtain IP Address • Gains ability to send IP traffic across network • User Types URL into Web Browser • Name Resolution Occurs • Data Routed Across Internet (Black Box) Network Server • Firewall Determines if Packet Allowed • TCP Stack Routes Packet to Process • Web Server Process’s Request • Web Page Routed Back to User Network Sniffing Packets Hub/Wireless Sniffing Packets • DEMO – Wireshark (http://wireshark.org/ ) – Fiddler2 (http://www.fiddler2.com/) IPv6 • IPv4 – Address Space = 2^32 – Address Exhaustion Soon (~2011) • IPv6 – Address Space = 2^128 – Ipsec Built In Steve Evans • • • • Microsoft MVP, Directory Services Blog – http://SerkTools.com Twitter - @scevans President of SerkTools (http://SerkTools.com) – Content Creation for Customers • Screencast, Whitepapers, Blogging, Events – Consulting • Microsoft IT Infrastructure (Active Directory, SQL, SharePoint, Exchange, Identity, etc) • Cloud Computing (especially AWS)
