UNIX for Dummies Questions & Answers

# See "man 8 inetd" for more information.
#
# If you make changes to this file, either reboot your machine or send the
# inetd a HUP signal:
# Do a "ps x" as root and look up the pid of inetd. Then do a
# "kill -HUP <pid of inetd>".
# The inetd will re-read this file whenever it gets that signal.
#
# <service_name> <sock_type> <proto> <flags> <user> <server_path> <args>
#
# The first 4 services are really only used for debugging purposes, so
# we comment them out since they can otherwise be used for some nasty
# denial-of-service attacks.  If you need them, uncomment them.
# echo          stream  tcp     nowait  root    internal
# echo          dgram   udp     wait    root    internal
# discard       stream  tcp     nowait  root    internal
# discard       dgram   udp     wait    root    internal
# daytime       stream  tcp     nowait  root    internal
# daytime       dgram   udp     wait    root    internal
# chargen       stream  tcp     nowait  root    internal
# chargen       dgram   udp     wait    root    internal
#time   stream  tcp     nowait  root    internal
#time   dgram   udp     wait    root    internal
#
# These are standard services.
#
#ftp    stream  tcp     nowait  root    /usr/sbin/tcpd  wu.ftpd -l -i -a
#telnet stream  tcp     nowait  root    /usr/sbin/tcpd  in.telnetd
#
# Use this one instead if you want to snoop on telnet users (try to use this
# for ethical purposes, ok folks?), and see 'man ttysnoop' and /etc/snooptab
# for further instructions:
# telnet  stream  tcp     nowait  root    /usr/sbin/tcpd  in.telnetsnoopd
#
# This is for BSD sendmail.  NOTE:  It's not a good idea to uncomment this
# one, since sendmail is already set up to run as a daemon in /etc/rc.d/rc.M.
# But, if you really want to run sendmail this way for some reason, you'll 
# need to uncomment the smtp line below AND change the line in /etc/rc.d/rc.M
# to run sendmail like this:  /usr/sbin/sendmail -q30m   
# ...otherwise the queue will not be processed.
# smtp  stream  tcp     nowait  root    /usr/sbin/tcpd  sendmail -bs
#
# The comsat daemon notifies the user of new mail when biff is set to y:
#comsat        dgram   udp     wait    root    /usr/sbin/tcpd  in.comsat
#
# Shell, login, exec and talk are BSD protocols.
#
#shell  stream  tcp     nowait  root    /usr/sbin/tcpd  in.rshd -L
#login  stream  tcp     nowait  root    /usr/sbin/tcpd  in.rlogind
# exec  stream  tcp     nowait  root    /usr/sbin/tcpd  in.rexecd
# talk  dgram   udp     wait    root    /usr/sbin/tcpd  in.talkd
#ntalk  dgram   udp     wait    root    /usr/sbin/tcpd  in.talkd
#
# Kerberos authenticated services
#
ktelnet stream tcp nowait root /usr/local/sbin/telnetd telnetd -a user 
# klogin        stream  tcp     nowait  root    /usr/sbin/tcpd  rlogind -k
# eklogin       stream  tcp     nowait  root    /usr/sbin/tcpd  rlogind -k -x
# kshell        stream  tcp     nowait  root    /usr/sbin/tcpd  rshd -k
#
# Services run ONLY on the Kerberos server
#
# krbupdate     stream  tcp     nowait  root    /usr/sbin/tcpd  registerd
# kpasswd       stream  tcp     nowait  root    /usr/sbin/tcpd  kpasswdd
#
# Pop et al
#
# pop2  stream  tcp     nowait  root    /usr/sbin/tcpd  in.pop2d
# Traditional BSD-based in.pop3d:
#pop3   stream  tcp     nowait  root    /usr/sbin/tcpd  in.pop3d
# GNU pop3d:
pop3    stream  tcp     nowait  root    /usr/sbin/tcpd  gnu-pop3d
# The ipop3d POP3 server is part of the Pine distribution.  If you've
# installed the Pine package, you may wish to switch to ipop3d by 
# commenting out the pop3 line above, and uncommenting the pop3 line below.
# pop3  stream  tcp     nowait  root    /usr/sbin/tcpd  ipop3d
imap2   stream  tcp     nowait  root    /usr/sbin/tcpd  imapd
#
# The Internet UUCP service.
#
# uucp  stream  tcp     nowait  uucp    /usr/sbin/tcpd  /usr/lib/uucp/uucico    -l
#
# Tftp service is provided primarily for booting.  Most sites
# run this only on machines acting as "boot servers." 
#
# tftp  dgram   udp     wait    nobody  /usr/sbin/tcpd  in.tftpd
# bootps        dgram   udp     wait    root    /usr/sbin/in.bootpd     in.bootpd
#
# Finger, systat and netstat give out user information which may be
# valuable to potential "system crackers."  Many sites choose to disable 
# some or all of these services to improve security.
# Try "telnet localhost systat" and "telnet localhost netstat" to see that
# information yourself!
#
#finger stream  tcp     nowait  nobody  /usr/sbin/tcpd  in.fingerd -u
# systat        stream  tcp     nowait  nobody  /usr/sbin/tcpd  /bin/ps -auwwx
# netstat       stream  tcp     nowait  root    /usr/sbin/tcpd  /bin/netstat    -a
#
# Ident service is used for net authentication
# Since we start identd as nobody, it can't write a .pid file in /var/run, so tell it
# to use /dev/null.  This is of little importance unless you run identd as a
# standalone daemon anyway.
auth    stream  tcp     wait    nobody  /usr/sbin/in.identd     in.identd -P/dev/null
#
# These are to start Samba, an smb server that can export filesystems to
# Pathworks, Lanmanager for DOS, Windows for Workgroups, Windows95, Lanmanager
# for Windows, Lanmanager for OS/2, Windows NT, etc.  
# If you're running smbd and nmbd from daemons in /etc/rc.d/rc.samba, then you
# shouldn't uncomment these lines.
# netbios-ssn     stream  tcp     nowait  root    /usr/sbin/smbd  smbd
# netbios-ns      dgram   udp     wait    root    /usr/sbin/nmbd  nmbd
#
# Sun-RPC based services.
# <service name/version><sock_type><rpc/prot><flags><user><server><args>
#
# rstatd/1-3    dgram   rpc/udp wait    root    /usr/sbin/tcpd  rpc.rstatd
# rusersd/2-3   dgram   rpc/udp wait    root    /usr/sbin/tcpd  rpc.rusersd
# walld/1       dgram   rpc/udp wait    root    /usr/sbin/tcpd  rpc.rwalld
#
# End of inetd.conf.