Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 04-08-2006 Installation Manual page 371

Network
ping [options] hostname or IP address
The ping command is the standard tool for testing the basic functionality of TCP/IP
networks. It sends a small data packet to the destination host, requesting an imme-
diate reply. If this works, ping displays a message to that effect, which indicates
that the network link is basically functioning.
-c number
Determines the total number of packages to send and ends after they have been
dispatched (by default, there is no limitation set)
-f
flood ping: sends as many data packages as possible; a popular means, reserved
for root, to test networks
-i value
Specifies the interval between two data packages in seconds (default: one
second)
nslookup
The domain name system resolves domain names to IP addresses. With this tool,
send queries to name servers (DNS servers).
telnet [options] hostname or IP address [port]
Telnet is actually an Internet protocol that enables you to work on remote hosts
across a network. telnet is also the name of a Linux program that uses this protocol
to enable operations on remote computers.
WARNING
Do not use telnet over a network on which third parties can "eavesdrop."
Particularly on the Internet, use encrypted transfer methods, such as ssh,
to avoid the risk of malicious misuse of a password (see the man page for
ssh).
Working with the Shell 371