TCP/IP Networking An Example
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1 TCP/IP Networking An Example Introductory material. This module illustrates the interactions of the protocols of the TCP/IP protocol suite with the help of an example. The example intents to motivate the study of the TCP/IP protocols. 1 A simple TCP/IP Example A user on host ( Argon ) makes a web access to URL tcpip-lab.edu/index.html. ("Argon") neon.tcpip-lab.edu ("Neon") Web request Web page Web client What actually happens in the network? Web server 2 1
2 HTTP Request and HTTP response Web browser runs an HTTP client program Web server runs an HTTP server program HTTP client sends an HTTP request to HTTP server HTTP server responds with HTTP response Argon HTTP client HTTP request HTTP response Neon HTTP server 3 HTTP Request GET /example.html HTTP/1.1 Accept: image/gif, */* Accept-Language: en-us Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 Host: Connection: Keep-Alive 4 2
3 HTTP Response HTTP/ OK Date: Sat, 25 May :10:32 GMT Server: Apache/ (Unix) Last-Modified: Sat, 25 May :51:33 GMT ETag: " ceff955" Accept-Ranges: bytes Content-Length: 81 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/html <HTML> <BODY> <H1>Internet Lab</H1> Click <a href=" for the Internet Lab webpage. </BODY> </HTML> How does the HTTP request get from Argon to Neon? 5 From HTTP to TCP To send request, HTTP client program establishes an TCP connectionto the HTTP server Neon. The HTTP server at Neon has a TCP server running Argon Neon HTTP client HTTP request / HTTP response HTTP server TCP client TCP connection TCP server 6 3
4 Resolving hostnames and port numbers Since TCP does not work with hostnames and also would not know how to find the HTTP server program at Neon, two things must happen: 1. The name neon.tcpip-lab.edu must be translated into a 32-bit IP address. 2. The HTTP server at Neon must be identified by a 16-bit port number. 7 Translating a hostname into an IP address The translation of the hostname neon.tcpip-lab.edu into an IP address is done via a database lookup neon.tcpip-lab.edu HTTP client DNS Server The distributed database used is called the Domain Name System (DNS) All machines on the Internet have an IP address: neon.tcpip-lab.edu
5 Finding the port number Note: Most services on the Internet are reachable via wellknown ports. E.g. All HTTP servers on the Internet can be reached at port number 80. So: Argon simply knows the port number of the HTTP server at a remote machine. On most Unix systems, the well-known ports are listed in a file with name /etc/services. The well-known port numbers of some of the most popular services are: ftp 21 finger 79 telnet 23 http 80 smtp 25 nntp Requesting a TCP Connection The HTTP client at requests the TCP client to establish a connection to port 80 of the machine with address HTTP client Establish a TCP connection to port 80 of TCP client 10 5
6 Invoking the IP Protocol The TCP client at Argon sends a request to establish a connection to port 80 at Neon This is done by asking its local IP module to send an IP datagram to (The data portion of the IP datagram contains the request to open a connection) TCP client IP Send an IP datagram to Sending the IP datagram to an IP router Argon ( ) can deliver the IP datagram directly to Neon ( ), only if it is on the same local network ( subnet ) But Argon and Neon are not on the same local network (Q: How does Argon know this?) So, Argon sends the IP datagram to its default gateway The default gateway is an IP router The default gateway for Argon is Router137.tcpip-lab.edu ( ). 12 6
7 The route from Argon to Neon "Argon" neon.tcpip-lab.edu "Neon" router137.tcpip-lab.edu "Router137" router71.tcpip-lab.edu "Router71" Router Ethernet Network Ethernet Network Note that the gateway has a different name for each of its interfaces. 13 Finding the MAC address of the gateway To send an IP datagram to Router137, Argon puts the IP datagram in an Ethernet frame, and transmits the frame. However, Ethernet uses different addresses, so-called Media Access Control (MAC) addresses (also called: physical address, hardware address) Therefore, Argon must first translate the IP address into a MAC address. The translation of addressed is performed via the Address Resolution Protocol (ARP) 14 7
8 Address resolution with ARP ARP message: What is the MAC address of ? ARP message: IP address belongs to MAC address 00:e0:f9:23:a8: :a0:24:71:e4:44 router137.tcpip-lab.edu :e0:f9:23:a8:20 15 Invoking the device driver The IP module at Argon, tells its Ethernet device driver to send an Ethernet frame to address 00:e0:f9:23:a8:20 IP module Ethernet Send an Ethernet frame to 00:e0:f9:23:a8:
9 Sending an Ethernet frame The Ethernet device driver of Argon sends the Ethernet frame to the Ethernet network interface card (NIC) The NIC sends the frame onto the wire IP Datagram for Neon :a0:24:71:e4:44 router137.tcpip-lab.edu :e0:f9:23:a8:20 17 Forwarding the IP datagram The IP router receives the Ethernet frame at interface , recovers the IP datagram and determines that the IP datagram should be forwarded to the interface with name The IP router determines that it can deliver the IP datagram directly "Argon" neon.tcpip-lab.edu "Neon" router137.tcpip-lab.edu "Router137" router71.tcpip-lab.edu "Router71" Router Ethernet Network Ethernet Network 18 9
10 Another lookup of a MAC address The rouer needs to find the MAC address of Neon. Again, ARP is invoked, to translate the IP address of Neon ( ) into the MAC address of neon (00:20:af:03:98:28). ARP message: What is the MAC address of ? ARP message: IP address belongs to MAC address 00:20:af:03:98:28 router71.tcpip-lab.edu neon.tcpip-lab.edu :20:af:03:98:28 19 Invoking the device driver at the router The IP protocol at Router71, tells its Ethernet device driver to send an Ethernet frame to address 00:20:af:03:98:28 router71.tcpip-lab.edu IP module Ethernet Send a frame to 00:20:af:03:98:
11 Sending another Ethernet frame The Ethernet device driver of Router71 sends the Ethernet frame to the Ethernet NIC, which transmits the frame onto the wire. IP Datagram for Neon router71.tcpip-lab.edu neon.tcpip-lab.edu :20:af:03:98:28 21 Data has arrived at Neon Neon receives the Ethernet frame The payload of the Ethernet frame is an IP datagram which is passed to the IP protocol. The payload of the IP datagram is a TCP segment, which is passed to the TCP server Note: Since the TCP segment is a connection request (SYN), the TCP protocol does not pass data to the HTTP program for this packet. Instead, the TCP protocol at neon will respond with a SYN segment to Argon. Neon.cerf.edu HTTP server TCP server IP module Ethernet 22 11
12 Wrapping-up the example So far, Neon has only obtained a single packet Much more work is required to establish an actual TCP connection and the transfer of the HTTP Request The example was simplified in several ways: No transmission errors The route between Argon and Neon is short (only one IP router) Argon knew how to contact the DNS server (without routing or address resolution). 23 How many packets were really sent? tcpdump: listening on fxp0 16:54: > : 1+ A? neon.cs. (25) 16:54: > : 1 NXDomain* 0/1/0 (98) (DF) 16:54: > : 2+ (41) 16:54: > : 2 NXDomain* 0/1/0 (109) (DF) 16:54: > : 3+ (38) 16:54: > : 3* 1/1/2 (122) (DF) 16:54: arp who-has tell :54: arp reply is-at 0:e0:f9:23:a8:20 16:54: > : S :607568(0) win 8192 <mss 1460> (DF) 16:54: > : S : (0) ack win <mss 1460> (DF) 16:54: > :. ack 1 win 8760 (DF) 16:54: > : P 1:60(59) ack 1 win (DF) [tos 0x10] 16:54: > :. ack 60 win 8701 (DF) 24 12
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