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    The following form allows you to view linux man pages.

    Command:

    netstat

    
    
    
    

    SYNOPSIS

           netstat  [address_family_options]  [--tcp|-t]   [--udp|-u]   [--raw|-w]
           [--listening|-l] [--all|-a] [--numeric|-n] [--numeric-hosts][--numeric-
           ports][--numeric-ports]   [--symbolic|-N]    [--extend|-e[--extend|-e]]
           [--timers|-o] [--program|-p] [--verbose|-v] [--continuous|-c] [delay]
    
           netstat              {--route|-r}              [address_family_options]
           [--extend|-e[--extend|-e]]  [--verbose|-v]  [--numeric|-n]  [--numeric-
           hosts][--numeric-ports][--numeric-ports] [--continuous|-c] [delay]
    
           netstat  {--interfaces|-I|-i}  [iface] [--all|-a] [--extend|-e] [--ver-
           bose|-v]  [--program|-p]  [--numeric|-n]   [--numeric-hosts][--numeric-
           ports][--numeric-ports] [--continuous|-c] [delay]
    
           netstat   {--groups|-g}   [--numeric|-n]   [--numeric-hosts][--numeric-
           ports][--numeric-ports] [--continuous|-c] [delay]
    
           netstat  {--masquerade|-M}  [--extend|-e]  [--numeric|-n]   [--numeric-
           hosts][--numeric-ports][--numeric-ports] [--continuous|-c] [delay]
    
           netstat {--statistics|-s} [--tcp|-t] [--udp|-u] [--raw|-w] [delay]
    
           netstat {--version|-V}
    
           netstat {--help|-h}
    
           address_family_options:
    
           [--protocol={inet,unix,ipx,ax25,netrom,ddp}[,...]]          [--unix|-x]
           [--inet|--ip] [--ax25] [--ipx] [--netrom] [--ddp]
    
    
    

    NOTE

           This program is obsolete.  Replacement for netstat is ss.   Replacement
           for  netstat -r is ip route.  Replacement for netstat -i is ip -s link.
           Replacement for netstat -g is ip maddr.
    
    
    

    DESCRIPTION

           Netstat prints information about the Linux networking  subsystem.   The
           type  of  information  printed  is controlled by the first argument, as
           follows:
    
       (none)
           By default, netstat displays a list of  open  sockets.   If  you  don't
           specify any address families, then the active sockets of all configured
           address families will be printed.
    
       --route , -r
           Display the kernel routing tables.
    
       --verbose , -v
           Tell the user what is going on by being verbose. Especially print  some
           useful information about unconfigured address families.
    
       --numeric , -n
           Show  numerical addresses instead of trying to determine symbolic host,
           port or user names.
    
       --numeric-hosts
           shows numerical host addresses but does not affect  the  resolution  of
           port or user names.
    
       --numeric-ports
           shows numerical port numbers but does not affect the resolution of host
           or user names.
    
       --numeric-users
           shows numerical user IDs but does not affect the resolution of host  or
           port names.
    
       --protocol=family , -A
           Specifies  the  address families (perhaps better described as low level
           protocols) for which connections are to be shown.  family  is  a  comma
           (',')  separated  list of address family keywords like inet, unix, ipx,
           ax25, netrom, and ddp.  This has the same effect as using  the  --inet,
           --unix (-x), --ipx, --ax25, --netrom, and --ddp options.
    
           The address family inet includes raw, udp and tcp protocol sockets.
    
       -c, --continuous
           This  will cause netstat to print the selected information every second
           continuously.
    
       -e, --extend
           Display additional information.  Use  this  option  twice  for  maximum
           detail.
    
       -o, --timers
           Include information related to networking timers.
    
       -p, --program
           Show the PID and name of the program to which each socket belongs.
    
       -l, --listening
           Show only listening sockets.  (These are omitted by default.)
    
       -a, --all
           Show  both  listening and non-listening (for TCP this means established
           connections) sockets.  With the --interfaces  option,  show  interfaces
           that are not marked
    
           UP.
    
    
    

    OUTPUT

       Active Internet connections (TCP, UDP, raw)
       Proto
           The protocol (tcp, udp, raw) used by the socket.
    
       Recv-Q
           The count of bytes not copied by the user  program  connected  to  this
           socket.
    
       Send-Q
           The count of bytes not acknowledged by the remote host.
    
       Local Address
           Address  and  port  number  of the local end of the socket.  Unless the
           --numeric (-n) option is specified, the socket address is  resolved  to
           its  canonical host name (FQDN), and the port number is translated into
           the corresponding service name.
    
       Foreign Address
           Address and port number of the remote end of the socket.  Analogous  to
           "Local Address."
    
       State
           The state of the socket. Since there are no states in raw mode and usu-
           ally no states used in UDP, this column may  be  left  blank.  Normally
           this can be one of several values:
    
           ESTABLISHED
                  The socket has an established connection.
    
           SYN_SENT
                  The socket is actively attempting to establish a connection.
    
           SYN_RECV
                  A connection request has been received from the network.
    
           FIN_WAIT1
                  The socket is closed, and the connection is shutting down.
    
           FIN_WAIT2
                  Connection  is  closed, and the socket is waiting for a shutdown
                  from the remote end.
    
           TIME_WAIT
                  The socket is waiting after close to handle packets still in the
                  network.
    
           CLOSED The socket is not being used.
    
    
           UNKNOWN
                  The state of the socket is unknown.
    
       User
           The username or the user id (UID) of the owner of the socket.
    
       PID/Program name
           Slash-separated  pair  of  the process id (PID) and process name of the
           process that owns the socket.   --program  causes  this  column  to  be
           included.  You will also need superuser privileges to see this informa-
           tion on sockets you don't own.  This identification information is  not
           yet available for IPX sockets.
    
       Timer
           (this needs to be written)
    
       Active UNIX domain Sockets
       Proto
           The protocol (usually unix) used by the socket.
    
       RefCnt
           The reference count (i.e. attached processes via this socket).
    
       Flags
           The  flags displayed is SO_ACCEPTON (displayed as ACC), SO_WAITDATA (W)
           or SO_NOSPACE (N).  SO_ACCECPTON is  used  on  unconnected  sockets  if
           their  corresponding  processes  are waiting for a connect request. The
           other flags are not of normal interest.
    
       Type
           There are several types of socket access:
    
           SOCK_DGRAM
                  The socket is used in Datagram (connectionless) mode.
    
           SOCK_STREAM
                  This is a stream (connection) socket.
    
           SOCK_RAW
                  The socket is used as a raw socket.
    
           SOCK_RDM
                  This one serves reliably-delivered messages.
    
           SOCK_SEQPACKET
                  This is a sequential packet socket.
    
           SOCK_PACKET
                  Raw interface access socket.
    
    
           CONNECTING
                  The socket is about to establish a connection.
    
           CONNECTED
                  The socket is connected.
    
           DISCONNECTING
                  The socket is disconnecting.
    
           (empty)
                  The socket is not connected to another one.
    
           UNKNOWN
                  This state should never happen.
    
       PID/Program name
           Process  ID  (PID)  and process name of the process that has the socket
           open.  More info available in Active Internet connections section writ-
           ten above.
    
       Path
           This  is the path name as which the corresponding processes attached to
           the socket.
    
       Active IPX sockets
           (this needs to be done by somebody who knows it)
    
       Active NET/ROM sockets
           (this needs to be done by somebody who knows it)
    
       Active AX.25 sockets
           (this needs to be done by somebody who knows it)
    
    
    

    NOTES

           Starting with Linux release 2.2 netstat  -i  does  not  show  interface
           statistics  for  alias  interfaces. To get per alias interface counters
           you need to setup explicit rules using the ipchains(8) command.
    
    
    

    FILES

           /etc/services -- The services translation file
    
           /proc -- Mount point for the proc filesystem,  which  gives  access  to
           kernel status information via the following files.
    
           /proc/net/dev -- device information
    
           /proc/net/appletalk -- DDP (appletalk) socket information
    
           /proc/net/nr -- NET/ROM socket information
    
           /proc/net/route -- IP routing information
    
           /proc/net/ax25_route -- AX25 routing information
    
           /proc/net/ipx_route -- IPX routing information
    
           /proc/net/nr_nodes -- NET/ROM nodelist
    
           /proc/net/nr_neigh -- NET/ROM neighbours
    
           /proc/net/ip_masquerade -- masqueraded connections
    
           /proc/net/snmp -- statistics
    
    
    

    SEE ALSO

           ss(8),ip(8)
    
    
    

    BUGS

           Occasionally  strange  information may appear if a socket changes as it
           is viewed. This is unlikely to occur.
    
    
    

    AUTHORS

           The  netstat  user   interface   was   written   by   Fred   Baumgarten
           <dc6iq@insu1.etec.uni-karlsruhe.de>  the  man  page  basically  by Matt
           Welsh   <mdw@tc.cornell.edu>.   It   was   updated    by    Alan    Cox
           <Alan.Cox@linux.org> but could do with a bit more work.  It was updated
           again by Tuan Hoang <tqhoang@bigfoot.com>.
           The man page and the command  included  in  the  net-tools  package  is
           totally rewritten by Bernd Eckenfels <ecki@linux.de>.
    
    
    

    net-tools 19 December 2000 NETSTAT(8)

    
    
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