netstat man page on Ultrix

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netstat(1)							    netstat(1)

Name
       netstat - show network status

Syntax
       netstat [ -Aan ] [ -f address_family ] [ system ] [ core ]
       netstat [ -himnrs ] [ -f address_family ] [ system ] [ core ]
       netstat [ -n ] [ -I interface ] interval [ system ] [ core ]
       netstat [ -I interface -s ] [ system ] [ core ]

Description
       The  command  displays  the contents of network-related data structures
       symbolically.  Depending on the options supplied to there are a	number
       of output formats.

       The  first  form	 of  the command displays a list of active sockets for
       each protocol.  The second form presents the contents  of  one  of  the
       other  network  data  structures according to the option selected.  The
       third form, with	 an  interval  specified,  continuously	 displays  the
       information  regarding  packet traffic on the configured network inter‐
       faces.  The fourth form displays the Digital Network Architecture (DNA)
       Ethernet Data Link Layer counters for an Ethernet interface, or the DNA
       Fiber Distributed Data Interface (FDDI) Data Link Layer counters for an
       FDDI  interface. It also presents the FDDI adapter's status and charac‐
       teristics for the FDDI interface.

       If no options are specified, displays the state of all  active  sockets
       from those using any of the protocols listed in

       The arguments, system and core allow substitutes for the defaults and

       If  an  interval is specified, display the information regarding packet
       traffic on the  configured  network  interfaces	continuously,  pausing
       interval seconds before refreshing the screen.

       There  are  a  number  of display formats, depending on the information
       presented.  The default display, for active sockets,  shows  the	 local
       and  remote  addresses, send and receive queue sizes (in bytes), proto‐
       col, and, optionally, the internal state of the protocol.

       Address formats are either of the form host.port or network.port, if  a
       socket's	 address  specifies  a	network	 but no specific host address.
       When known, the host and network addresses are  displayed  symbolically
       according  to  the data bases and respectively.	If a symbolic name for
       an address is unknown, or if the -n option is specified, the address is
       printed	in  the	 Internet  dot	format.	 Refer to for more information
       regarding this format.  Unspecified, or wildcard, addresses  and	 ports
       appear as an asterisk (*).

       The interface display provides a table of cumulative statistics regard‐
       ing packets transferred, errors, and collisions.	 The  network  address
       (currently  Internet  specific) of the interface and the maximum trans‐
       mission unit (mtu) are also displayed.

       The routing table display indicates the available routes and their sta‐
       tus.   Each route consists of a destination host or network and a gate‐
       way to use in forwarding packets.  The flags field shows the  state  of
       the  route  (for	 example,  U if up), whether the route is to a gateway
       (G), and whether the route was created dynamically by a	redirect  (D).
       Direct  routes  are  created  for  each interface attached to the local
       host.  The gateway field for such entries shows the address of the out‐
       going  interface.   The refcnt field gives the current number of active
       uses of the route.  Connection oriented protocols normally hold on to a
       single  route  for  the	duration of a connection, while connectionless
       protocols obtain a route while sending to the  same  destination.   The
       use  field  provides  a	count of the number of packets sent using that
       route.  The interface entry indicates the  network  interface  utilized
       for the route.

       When  is invoked with an interval argument, it displays a running count
       of statistics related to network interfaces.  This display consists  of
       a  column  for  the primary interface (the first interface found during
       autoconfiguration), and a column summarizing information for all inter‐
       faces.	The  primary  interface may be replaced with another interface
       with the -I option.  The first line of each screen of information  con‐
       tains  a	 summary since the system was last rebooted.  Subsequent lines
       of output show values accumulated over the preceding interval.

Options
       -A		   Displays the address	 of  any  associated  protocol
			   control blocks; used for debugging.

       -a		   Displays the information for all sockets.  Normally
			   sockets used by server processes are not shown.

       -f address_family   Limits statistics or address control block  reports
			   to  those  of the specified address family.	Recog‐
			   nized address families are inet, for	 AF_INET,  and
			   unix, for AF_UNIX.

       -h		   Displays the state of the IMP host table.

       -I interface	   Shows  information only about this interface.  Used
			   with an interval displayed below.

       -I interface -s	   Displays the DNA Ethernet Data Link Layer  counters
			   for	an  Ethernet interface.	 Displays the DNA FDDI
			   Data Link  Layer  counters,	adapter's  status  and
			   characteristics for an FDDI interface.

       -i		   Displays   status  information  for	autoconfigured
			   interfaces .	 Interfaces statically configured into
			   a  system,  but  not	 located  at boot time are not
			   shown.

       -m		   Displays information for the memory management rou‐
			   tines  The  network manages a private share of mem‐
			   ory.

       -n		   Displays network addresses  as  numbers.   Normally
			   interprets  addresses  and attempts to display them
			   symbolically.

       -r		   Displays the	 routing  tables.   When  -s  is  also
			   present, shows routing statistics instead.

       -s		   Displays per-protocol statistics.

       -t		   Displays  time  until  interface  watchdog  routine
			   starts  up  (used  only  in	conjunction  with   -i
			   option).

See Also
       iostat(1), vmstat(1), hosts(5), networks(5), protocols(5), services(5),
       trpt(8c)

								    netstat(1)
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