Introduction and Overview

Schedule

Tue	7:00	Introduction and Overview
	8:00	TCP
	9:00	IPv6
Wed	7:00	Routing and Addressing
	8:00	Level 2 Networking
	9:00	Internet Engineering
Thu	7:00	Utilities
	8:00	Applications
	9:00	Security

Who are we?

course sponsored by SIPB

Instructors:

Elliot Schwartz <elliot@mit.edu>
John Hawkinson <jhawk@mit.edu>

Internetworking

What is the problem?

How do you solve it?

Layering

Why do you want it?
How do you create it?
How do you use it?
A few words on the ISO-OSI model

Views of Layering

Services provided

Reliable data streams

Packets between any nodes

Packets between nodes on same wire

Data structure

Level 2 Header

IP Header

TCP Header

Ethernet-IP-TCP
FDDI-IP-UDP
PPP-Appletalk-DDP

Code

Communicate with remote node
to achieve reliability via
retransmissions, etc.

Communicate with remote node

Get packet to next gateway

TCP (Transmission Control Protocol)

expects: unreliable packet service between nodes
provides: reliable stream service between nodes

IPv6

expects: a way to communicate with nodes on the same subnet
provides: a way to communicate with any node on the Internet

Routing

given: a set of routers that can forward packets
solves: the problem of deciding where to forward them

Level 2

expects: machines with some sort of physical connection
provides: a way for these machines to communicate

Internet Engineering

What do you do in real life?

addressing
level 2 technologies
IP toplogies

Utilities

How can you explore the network yourself?

ping
traceroute
tcpdump
pathchar

Applications

expects: a reliable stream connection
provides: services useful to humans
we'll look at E-mail and the Web

Security

two main security problems

authentication
privacy

problems and solutions exist at various layers