Network Monitoring

Linux
Basic network monitoring tools and example runs: netstat -pnta  current TCP/IP connections ifconfig       NIC configuration arp            address resolution table IP > MAC route          show IP routing table

tcpdump -ieth1 src port not 22 and dst port not 22 dump TCP traffic

Ethereal
This example dumps packets on NIC eth1 to or from port 80 (webserver) tethereal -Vx -ieth1 -f 'dst port 80 or src port 80'|less Make a HTTP request on another machine: wget -O- http://www.servername.dk

Windows
Basic network monitoring tools and example runs: netstat -a     current TCP/IP connections ipconfig /all  NIC configuration, including MAC arp -a         address resolution table IP > MAC route print    show IP routing table ethereal       analyze traffic

tcpdump is also available for windows from http://www.winpcap.org/windump/