A day in the life: scenario

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Presentation transcript:

A day in the life: scenario browser DNS server Comcast network 68.80.0.0/13 school network 142.1.103.0/24 web page web server Google’s network 64.233.160.0/19 64.233.169.105 05linkC CSCD58S Computer Networking

A day in the life… connecting to the Internet DHCP UDP IP Eth Phy DHCP DHCP connecting laptop needs to get its own IP address, addr of first-hop router, addr of DNS server: use DHCP router (runs DHCP) DHCP DHCP request encapsulated in UDP, encapsulated in IP, encapsulated in 802.3 Ethernet DHCP DHCP UDP IP Eth Phy DHCP Ethernet frame broadcast (dest: FF:FF:FF:FF:FF:FF) on LAN, received at router running DHCP server Ethernet demuxed to IP demuxed, UDP demuxed to DHCP 05linkC CSCD58S Computer Networking

A day in the life… connecting to the Internet DHCP DHCP UDP IP Eth Phy DHCP server formulates DHCP ACK containing client’s IP address, IP address of first-hop router for client, name & IP address of DNS server router (runs DHCP) encapsulation at DHCP server, frame forwarded (switch learning) through LAN, demultiplexing at client DHCP UDP IP Eth Phy DHCP DHCP DHCP client receives DHCP ACK reply DHCP Client now has IP address, knows name & addr of DNS server, IP address of its first-hop router 05linkC CSCD58S Computer Networking

A day in the life… ARP (before DNS, before HTTP) before sending HTTP request, need IP address of www.google.com: DNS DNS UDP IP Eth Phy DNS router (runs DHCP) ARP ARP query DNS query created, encapsulated in UDP, encapsulated in IP, encapsulated in Eth. To send frame to router, need MAC address of router interface: ARP Eth Phy ARP ARP reply ARP query broadcast, received by router, which replies with ARP reply giving MAC address of router interface client now knows MAC address of first hop router, so can now send frame containing DNS query 05linkC CSCD58S Computer Networking

A day in the life… using DNS UDP IP Eth Phy DNS DNS server DNS UDP IP Eth Phy DNS router (runs DHCP) DNS DNS DNS DNS Comcast network 68.80.0.0/13 IP datagram forwarded from campus network into comcast network, routed (tables created by RIP, OSPF, IS-IS and/or BGP routing protocols) to DNS server IP datagram containing DNS query forwarded via LAN switch from client to 1st hop router demux’ed to DNS server DNS server replies to client with IP address of www.google.com 05linkC CSCD58S Computer Networking

A day in the life…TCP connection carrying HTTP IP Eth Phy router (runs DHCP) SYN SYNACK SYN to send HTTP request, client first opens TCP socket to web server TCP SYN segment (step 1 in 3-way handshake) inter-domain routed to web server TCP IP Eth Phy SYNACK SYN SYNACK web server responds with TCP SYNACK (step 2 in 3-way handshake) web server 64.233.169.105 TCP connection established! 05linkC CSCD58S Computer Networking

A day in the life… HTTP request/reply web page finally (!!!) displayed HTTP HTTP TCP IP Eth Phy router (runs DHCP) HTTP HTTP HTTP request sent into TCP socket (along with SYNACK ACK) IP datagram containing HTTP request routed to www.google.com HTTP TCP IP Eth Phy HTTP web server responds with HTTP response (containing web page) HTTP web server IP datagram containing HTTP response routed back to client 64.233.169.105 05linkC CSCD58S Computer Networking