


      NETSTAT(1)                 (Bull-SPS9)                 NETSTAT(1)



      NAME
           netstat - show network status

      SYNOPSIS
           netstat [ -Aahimnrs ] [ -p protocol ] [ -a ] [ interval ]

      DESCRIPTION
           The netstat command symbolically displays the contents of
           various network-related data structures.  The 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)

           -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

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



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      NETSTAT(1)                 (Bull-SPS9)                 NETSTAT(1)



           ``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
           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 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.

      SEE ALSO
           hosts(4), networks(4), protocols(4), services(4)

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

           The tables required by -h and -m are not available on a
           Bull-SPS9.  The -p option is not implemented.






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