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-.\" Copyright (c) 1983, 1990, 1992, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	@(#)netstat.1	8.8 (Berkeley) 4/18/94
-.\" $FreeBSD$
-.\"
-.Dd January 10, 2010
-.Dt NETSTAT 1
-.Os
-.Sh NAME
-.Nm netstat
-.Nd show network status
-.Sh DESCRIPTION
-The
-.Nm
-command symbolically displays the contents of various network-related
-data structures.
-There are a number of output formats,
-depending on the options for the information presented.
-.Bl -tag -width indent
-.It Xo
-.Bk -words
-.Nm
-.Op Fl AaLnSWx
-.Op Fl f Ar protocol_family | Fl p Ar protocol
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Ek
-.Xc
-Display a list of active sockets
-(protocol control blocks)
-for each network protocol,
-for a particular
-.Ar protocol_family ,
-or for a single
-.Ar protocol .
-If
-.Fl A
-is also present,
-show the address of a protocol control block (PCB)
-associated with a socket; used for debugging.
-If
-.Fl a
-is also present,
-show the state of all sockets;
-normally sockets used by server processes are not shown.
-If
-.Fl L
-is also present,
-show the size of the various listen queues.
-The first count shows the number of unaccepted connections,
-the second count shows the amount of unaccepted incomplete connections,
-and the third count is the maximum number of queued connections.
-If
-.Fl S
-is also present,
-show network addresses as numbers (as with
-.Fl n )
-but show ports symbolically.
-If
-.Fl x
-is present display full socket buffer statistics for each internet socket.
-.It Xo
-.Bk -words
-.Nm
-.Fl i | I Ar interface
-.Op Fl abdhntW
-.Op Fl f Ar address_family
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Ek
-.Xc
-Show the state of all network interfaces or a single
-.Ar interface
-which have been auto-configured
-(interfaces statically configured into a system, but not
-located at boot time are not shown).
-An asterisk
-.Pq Dq Li *
-after an interface name indicates that the interface is
-.Dq down .
-If
-.Fl a
-is also present, multicast addresses currently in use are shown
-for each Ethernet interface and for each IP interface address.
-Multicast addresses are shown on separate lines following the interface
-address with which they are associated.
-If
-.Fl b
-is also present, show the number of bytes in and out.
-If
-.Fl d
-is also present, show the number of dropped packets.
-If
-.Fl h
-is also present, print all counters in human readable form.
-If
-.Fl t
-is also present, show the contents of watchdog timers.
-If
-.Fl W
-is also present, print interface names using a wider field size.
-.It Xo
-.Bk -words
-.Nm
-.Fl w Ar wait
-.Op Fl I Ar interface
-.Op Fl d
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Op Fl q Ar howmany
-.Ek
-.Xc
-At intervals of
-.Ar wait
-seconds,
-display the information regarding packet
-traffic on all configured network interfaces
-or a single
-.Ar interface .
-If
-.Fl q
-is also present, exit after
-.Ar howmany
-outputs.
-If
-.Fl d
-is also present, show the number of dropped packets.
-.It Xo
-.Bk -words
-.Nm
-.Fl s Op Fl s
-.Op Fl z
-.Op Fl f Ar protocol_family | Fl p Ar protocol
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Ek
-.Xc
-Display system-wide statistics for each network protocol,
-for a particular
-.Ar protocol_family ,
-or for a single
-.Ar protocol .
-If
-.Fl s
-is repeated, counters with a value of zero are suppressed.
-If
-.Fl z
-is also present, reset statistic counters after displaying them.
-.It Xo
-.Bk -words
-.Nm
-.Fl i | I Ar interface Fl s
-.Op Fl f Ar protocol_family | Fl p Ar protocol
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Ek
-.Xc
-Display per-interface statistics for each network protocol,
-for a particular
-.Ar protocol_family ,
-or for a single
-.Ar protocol .
-.It Xo
-.Bk -words
-.Nm
-.Fl m
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Ek
-.Xc
-Show statistics recorded by the memory management routines
-.Pq Xr mbuf 9 .
-The network manages a private pool of memory buffers.
-.It Xo
-.Bk -words
-.Nm
-.Fl B
-.Op Fl z
-.Op Fl I Ar interface
-.Ek
-.Xc
-Show statistics about
-.Xr bpf 4
-peers.
-This includes information like
-how many packets have been matched, dropped and received by the
-bpf device, also information about current buffer sizes and device
-states.
-.It Xo
-.Bk -words
-.Nm
-.Fl r
-.Op Fl AanW
-.Op Fl f Ar address_family
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Ek
-.Xc
-Display the contents of all routing tables,
-or a routing table for a particular
-.Ar address_family .
-If
-.Fl A
-is also present,
-show the contents of the internal Patricia tree
-structures; used for debugging.
-If
-.Fl a
-is also present,
-show protocol-cloned routes
-(routes generated by an
-.Dv RTF_PRCLONING
-parent route);
-normally these routes are not shown.
-When
-.Fl W
-is also present,
-show the path MTU
-for each route,
-and print interface
-names with a wider
-field size.
-.It Xo
-.Bk -words
-.Nm
-.Fl rs
-.Op Fl s
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Ek
-.Xc
-Display routing statistics.
-If
-.Fl s
-is repeated, counters with a value of zero are suppressed.
-.It Xo
-.Bk -words
-.Nm
-.Fl g
-.Op Fl W
-.Op Fl f Ar address_family
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Ek
-.Xc
-Display the contents of the multicast virtual interface tables,
-and multicast forwarding caches.
-Entries in these tables will appear only when the kernel is
-actively forwarding multicast sessions.
-This option is applicable only to the
-.Cm inet
-and
-.Cm inet6
-address families.
-.It Xo
-.Bk -words
-.Nm
-.Fl gs
-.Op Fl s
-.Op Fl f Ar address_family
-.Op Fl M Ar core
-.Op Fl N Ar system
-.Ek
-.Xc
-Show multicast routing statistics.
-If
-.Fl s
-is repeated, counters with a value of zero are suppressed.
-.El
-.Pp
-Some options have the general meaning:
-.Bl -tag -width flag
-.It Fl f Ar address_family , Fl p Ar protocol
-Limit display to those records
-of the specified
-.Ar address_family
-or a single
-.Ar protocol .
-The following address families and protocols are recognized:
-.Pp
-.Bl -tag -width ".Cm netgraph , ng Pq Dv AF_NETGRAPH" -compact
-.It Em Family
-.Em Protocols
-.It Cm inet Pq Dv AF_INET
-.Cm divert , icmp , igmp , ip , ipsec , pim, sctp , tcp , udp
-.It Cm inet6 Pq Dv AF_INET6
-.Cm icmp6 , ip6 , ipsec6 , rip6 , tcp , udp
-.It Cm pfkey Pq Dv PF_KEY
-.Cm pfkey
-.It Cm atalk Pq Dv AF_APPLETALK
-.Cm ddp
-.It Cm netgraph , ng Pq Dv AF_NETGRAPH
-.Cm ctrl , data
-.It Cm ipx Pq Dv AF_IPX
-.Cm ipx , spx
-.\".It Cm ns Pq Dv AF_NS
-.\".Cm idp , ns_err , spp
-.\".It Cm iso Pq Dv AF_ISO
-.\".Cm clnp , cltp , esis , tp
-.It Cm unix Pq Dv AF_UNIX
-.It Cm link Pq Dv AF_LINK
-.El
-.Pp
-The program will complain if
-.Ar protocol
-is unknown or if there is no statistics routine for it.
-.It Fl M
-Extract values associated with the name list from the specified core
-instead of the default
-.Pa /dev/kmem .
-.It Fl N
-Extract the name list from the specified system instead of the default,
-which is the kernel image the system has booted from.
-.It Fl n
-Show network addresses and ports as numbers.
-Normally
-.Nm
-attempts to resolve addresses and ports,
-and display them symbolically.
-.It Fl W
-In certain displays, avoid truncating addresses even if this causes
-some fields to overflow.
-.El
-.Pp
-The default display, for active sockets, shows the local
-and remote addresses, send and receive queue sizes (in bytes), protocol,
-and the internal state of the protocol.
-Address formats are of the form
-.Dq host.port
-or
-.Dq 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 databases
-.Xr hosts 5
-and
-.Xr networks 5 ,
-respectively.
-If a symbolic name for an address is unknown, or if
-the
-.Fl n
-option is specified, the address is printed numerically, according
-to the address family.
-For more information regarding
-the Internet IPv4
-.Dq dot format ,
-refer to
-.Xr inet 3 .
-Unspecified,
-or
-.Dq wildcard ,
-addresses and ports appear as
-.Dq Li * .
-.Pp
-The interface display provides a table of cumulative
-statistics regarding packets transferred, errors, and collisions.
-The network addresses of the interface
-and the maximum transmission unit
-.Pq Dq mtu
-are also displayed.
-.Pp
-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 a collection of information about the route stored
-as binary choices.
-The individual flags are discussed in more detail in the
-.Xr route 8
-and
-.Xr route 4
-manual pages.
-The mapping between letters and flags is:
-.Bl -column ".Li W" ".Dv RTF_WASCLONED"
-.It Li 1 Ta Dv RTF_PROTO1 Ta "Protocol specific routing flag #1"
-.It Li 2 Ta Dv RTF_PROTO2 Ta "Protocol specific routing flag #2"
-.It Li 3 Ta Dv RTF_PROTO3 Ta "Protocol specific routing flag #3"
-.It Li B Ta Dv RTF_BLACKHOLE Ta "Just discard pkts (during updates)"
-.It Li b Ta Dv RTF_BROADCAST Ta "The route represents a broadcast address"
-.It Li C Ta Dv RTF_CLONING Ta "Generate new routes on use"
-.It Li c Ta Dv RTF_PRCLONING Ta "Protocol-specified generate new routes on use"
-.It Li D Ta Dv RTF_DYNAMIC Ta "Created dynamically (by redirect)"
-.It Li G Ta Dv RTF_GATEWAY Ta "Destination requires forwarding by intermediary"
-.It Li H Ta Dv RTF_HOST Ta "Host entry (net otherwise)"
-.It Li L Ta Dv RTF_LLINFO Ta "Valid protocol to link address translation"
-.It Li M Ta Dv RTF_MODIFIED Ta "Modified dynamically (by redirect)"
-.It Li R Ta Dv RTF_REJECT Ta "Host or net unreachable"
-.It Li S Ta Dv RTF_STATIC Ta "Manually added"
-.It Li U Ta Dv RTF_UP Ta "Route usable"
-.It Li W Ta Dv RTF_WASCLONED Ta "Route was generated as a result of cloning"
-.It Li X Ta Dv RTF_XRESOLVE Ta "External daemon translates proto to link address"
-.El
-.Pp
-Direct routes are created for each
-interface attached to the local host;
-the gateway field for such entries shows the address of the outgoing 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.
-.Pp
-When
-.Nm
-is invoked with the
-.Fl w
-option and a
-.Ar wait
-interval argument, it displays a running count of statistics related to
-network interfaces.
-An obsolescent version of this option used a numeric parameter
-with no option, and is currently supported for backward compatibility.
-By default, this display summarizes information for all interfaces.
-Information for a specific interface may be displayed with the
-.Fl I
-option.
-.Pp
-The
-.Xr bpf 4
-flags displayed when
-.Nm
-is invoked with the
-.Fl B
-option represent the underlying parameters of the bpf peer.
-Each flag is
-represented as a single lower case letter.
-The mapping between the letters and flags in order of appearance are:
-.Bl -column ".Li i"
-.It Li p Ta Set if listening promiscuously
-.It Li i Ta Dv BIOCIMMEDIATE No has been set on the device
-.It Li f Ta Dv BIOCGHDRCMPLT No status: source link addresses are being
-filled automatically
-.It Li s Ta Dv BIOCGSEESENT No status: see packets originating locally and
-remotely on the interface.
-.It Li a Ta Packet reception generates a signal
-.It Li l Ta Dv BIOCLOCK No status: descriptor has been locked
-.El
-.Pp
-For more information about these flags, please refer to
-.Xr bpf 4 .
-.Pp
-The
-.Fl x
-flag causes
-.Nm
-to output all the information recorded about data
-stored in the socket buffers.
-The fields are:
-.Bl -column ".Li R-MBUF"
-.It Li R-MBUF Ta Number of mbufs in the receive queue.
-.It Li S-MBUF Ta Number of mbufs in the send queue.
-.It Li R-CLUS Ta Number of clusters, of any type, in the receive
-queue.
-.It Li S-CLUS Ta Number of clusters, of any type, in the send queue.
-.It Li R-HIWA Ta Receive buffer high water mark, in bytes.
-.It Li S-HIWA Ta Send buffer high water mark, in bytes.
-.It Li R-LOWA Ta Receive buffer low water mark, in bytes.
-.It Li S-LOWA Ta Send buffer low water mark, in bytes.
-.It Li R-BCNT Ta Receive buffer byte count.
-.It Li S-BCNT Ta Send buffer byte count.
-.It Li R-BMAX Ta Maximum bytes that can be used in the receive buffer.
-.It Li S-BMAX Ta Maximum bytes that can be used in the send buffer.
-.El
-.Sh SEE ALSO
-.Xr fstat 1 ,
-.Xr nfsstat 1 ,
-.Xr procstat 1 ,
-.Xr ps 1 ,
-.Xr sockstat 1 ,
-.Xr bpf 4 ,
-.Xr inet 4 ,
-.Xr route 4 ,
-.Xr unix 4 ,
-.Xr hosts 5 ,
-.Xr networks 5 ,
-.Xr protocols 5 ,
-.Xr services 5 ,
-.Xr iostat 8 ,
-.Xr route 8 ,
-.Xr trpt 8 ,
-.Xr vmstat 8 ,
-.Xr mbuf 9
-.Sh HISTORY
-The
-.Nm
-command appeared in
-.Bx 4.2 .
-.Pp
-IPv6 support was added by WIDE/KAME project.
-.Sh BUGS
-The notion of errors is ill-defined.