netstat(1N)                                           netstat(1N)



     NAME
          netstat - show network status

     SYNOPSIS
          netstat [-A] [-a] [-h] [-i] [-m] [-n] [-p protocol] [-r]
          [-s] [-t] [interval] [system] [core]

     DESCRIPTION
          The netstat command symbolically displays the contents of
          various network-related data structures, for a local network
          running B-NET software.  The flag options have the following
          meaning:

          -A        show the address of any associated protocol
                    control blocks; used for debugging

          -a        show the state of all sockets; normally, sockets
                    used by server processes are not shown

          -h        show the state of the IMP host table

          -i        show the state of interfaces which have been
                    auto-configured (interfaces statically configured
                    into a system, but not located at boot time are
                    not shown)

          -t        show the timer data; note that the -t flag option
                    must be used in conjunction with the -i flag
                    option

          -m        show statistics recorded by the memory management
                    routines (the network manages a private share of
                    memory)

          -n        show network addresses as numbers (normally
                    netstat interprets addresses and attempts to
                    display them symbolically)

          -p proto  show the state of sockets utilizing protocol
                    proto; the protocol is specified symbolically, and
                    may be any protocol listed in the file
                    /etc/protocols.

          -s        show per-protocol statistics

          -r        show the routing tables

          The arguments system and core allow substitutes for the
          defaults /unix and /dev/kmem.

          If an interval is specified, netstat will display the
          information continuously regarding packet traffic on the



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     netstat(1N)                                           netstat(1N)



          configured network interfaces, 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), protocol, and, optionally,
          the internal state of the protocol.

          Address formats are 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
          /etc/hosts and /etc/networks, respectively.  If a symbolic
          name for an address is unknown, or if the -n flag option is
          specified, the address is printed in the Internet dot
          format; refer to inet(3N) for more information regarding
          this format.  Unspecified, or wildcard, addresses and ports
          appear as *.

          The interface display provides a table of cumulative
          statistics regarding packets transferred, errors, and
          collisions.  The network address (currently
          Internet-specific) of the interface and the maximum
          transmission unit (mtu) are also displayed.

          The routing table display indicates the available routes and
          their status.  Each route consists of a destination host or
          network and a gateway to use in forwarding packets.  The
          flags field shows the state of the route (U if up), and
          whether the route is to a gateway (G).  Direct routes are
          created for each interface attached to the local host.  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 and then discard it.
          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 netstat is invoked with an interval argument, it
          displays a running count of statistics related to network
          interfaces.  This display consists of a column summarizing
          information for all interfaces, and a column for the
          interface with the most traffic since the system was last
          rebooted.  The first line of each screen of information
          contains a summary since the system was last rebooted.
          Subsequent lines of output show values accumulated over the
          preceding interval.

     FILES
          /usr/bin/netstat



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     netstat(1N)                                           netstat(1N)



     SEE ALSO
          hosts(4N), networks(4N), protocols(4N), services(4N),
          trpt(1M).

     BUGS
          The notion of errors is ill-defined.  Collisions mean
          something else for the IMP.
















































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