o NAMESERVER

	Check if /etc/nameserver contains correct DNS ip-address


o route: manually manipulate the routing tables

        Examples:

       /bin/route add -net ${NETWORK} netmask ${NETMASK}
       /bin/route add default gw ${GATEWAY} metric 1

o ifconfig: configure network interface parameters

	Examples: ethernet card
	
        /bin/ifconfig eth0 ${IPADDR} netmask ${NETMASK}

o ping: send ICMP ECHO_REQUEST packets to network hosts

	Examples:

		ping <host>

o traceroute: print the route packets take to network host
	Examples:
		traceroute <host>

o tcpdump/trafshow: views  incoming/outgoing IP traffic

	Examples:
		tcpdump [ -i interface ]

o telnet: User interface to the TELNET protocol

	Usage: telnet <host>

	Ignore garbage escape!

o rlogin: terminal session or remote host

	# rlogin -l user host	
     or
	# telnet2

o nmap (rustic), network mapper

	# nmap host

o netcat: multi-purpose port scanner ( see nc -h)


	# nc host [port]
