5.5 - Command Line Tools

ping - Test reachability

• ping <ip address> - Test reachability to a TCP/IP address

• ping -t <ip address> - Ping until stopped with Ctrl-c

• ping -n <count> <ip address> - Send # of echo requests

traceroute

Determine the route a packet takes to a destination

nslookup and dig

Lookup information from DNS servers

tcpdump

• Capture packets from the command line

• Available in most Unix/Linux operating systems

– Included with Mac OS X, available for Windows (WinDump)

• Apply filters, view in real-time

• Written in standard pcap format

netstat

Display network statistics

ping -t <ip address>

Ping until stopped with Ctrl-c

ping -n <count> <ip address>

Send # of echo requests

netstat -a -

Show all active connection

netstat -b

- Show binaries

netstat -n

Do not resolve names

ipconfig

Windows TCP/IP config

ipconfig /all

Display all IP config details

pconfig /release

Release the DHCP lease

ipconfig /renew

Renew the DHCP lease

ipconfig /flushdns

Flush the resolver cache

ifconfig

inux interface configuration

ip address

The latest Linux utility

arp -a -

View the local ARP table