Table of contents

Title: Network Troubleshooting

Overview

Goals

NIC Configuration

Default Gateway

Pinging

Disabling Ping

TCP/IP Network Model

Into Layer 2

Layer 2 Ping

Last Straw

Exercise 2.1

Resolving Names

nslookup

Better "digs"

DNS Tracing

Exercise 2.2

Examining Routes

Second Opinion

Another Opinion

Another Opinion (cont)

What's Out There? (nmap)

What's Out There? (nbtscan)

What's Out There? (other)

Exercise 2.3

What's Happening?

Just the Highlights

Sniffing

Switch Blind!

Something Wicked This Way Comes

Fighting Infection

Feeble Attempts at Prevention

Best Defense

Play Nice!

End

Author: Chris Cox

E-mail: cjcox@acm.org