arp: This program lets the user read or modify their arp cache.
biff: Notifies the system if mail arrives and who it is from.
comsat: Biff server to receive reports of incoming mail.
dig : Send domain name query packets to name servers for debugging or testing.
dnsdomainname: Show the systems DNS domain name
domainname: Show or set the systems domain name
ethtool : Show Ethernet interface.
expire: Used to purge old news articles.
finger: Display information about the system users.
ftp: File transfer program based on file transfer protocol.
hostname: Used to show or set the name of your machine for networking
ifdown: Shutdown a network interface.
ifup: Brings a network interface up. Ex: ifup eth0
ipchains: IP firewall administration used to set input, forward, and output rules.
metasend: Interface for sending non-text mail.
netconf: A GUI interactive program to let you configure a network on Redhat systems.
netconfig: Another GUI step by step network configuration program.
netstat: Displays information about the systems network connections, including port connections, routing tables, and more.
nisdomainname: Show or set systems NIS/YP domain name
pftp: Same as ftp.
pine: Program for internet news and e-mail.
ping: Send ICMP ECHO_REQUEST packets to network hosts.
portmap: DARPA port to RPC program number mapper. Must be running to make RPC calls.
rarp: Manipulate the system's RARP table.
rcp: Remote file copy. Copies files between two machines.
rexec: Remote execution client for an exec server. The host uses the rexecd server.
ripquery: Query RIP gateways. Request all routes known by an RIP gateway by sending an RIP request.
rlogin: Starts a terminal session on a remote host.
rsh: Executes command on remote host.
rup: Displays summary of current system status of a remote host or all hosts on the network.
ruptime: Show host status of local machines.
rwhod: System status server, maintains database used by rwho and ruptime.
sendmail: A popular Unix, Linux mail message transfer agent.
showmount: Show mount information for an NFS server.
smail: A popular mail message transfer agent which is easier to set up than sendmail.
talk: Lets two parties talk simultaneously.
tcpd: Access control facility for internet services. Can be set up to monitor requests for Telnet, finger, ftp, exec, rsh, rlogin, tftp, talk, comsat.
tcpdchk: Tcp wrapper configuration checker.
tcpdmatch: Predicts how the tcp wrapper will handle a specific request for a service.
tcpdump: Dump traffic on a network. Prints out headers of packets that match the boolean expression.
telnet: Allows a user to have a login session across a network on a remote host.
traceroute: Print the route that packets take to the specified network host.
write: Allows users to directly interact with other users via terminal number.
ypdomainname: Show or set the system's NIS/YP domain name