 @@ -1,416 +1,416 @@
-.\"	$NetBSD: netstat.1,v 1.50 2009/03/11 13:54:29 joerg Exp $
+.\"	$NetBSD: netstat.1,v 1.51 2009/05/28 14:57:42 christos Exp $
 .\"
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 .\"	@(#)netstat.1	8.8 (Berkeley) 4/18/94
 .\"
 .Dd August 30, 2007
 .Dt NETSTAT 1
 .Os
 .Sh NAME
 .Nm netstat
 .Nd show network status
 .Sh SYNOPSIS
 .Nm
 .Op Fl Aan
 .Op Fl f Ar address_family
 .Op Fl M Ar core
 .Op Fl N Ar system
 .Nm
 .Op Fl bdgiLmnqrSsv
 .Op Fl f Ar address_family
 .Op Fl M Ar core
 .Op Fl N Ar system
 .Nm
 .Op Fl dn
 .Op Fl I Ar interface
 .Op Fl M Ar core
 .Op Fl N Ar system
 .Op Fl w Ar wait
 .Nm
 .Op Fl M Ar core
 .Op Fl N Ar system
 .Op Fl p Ar protocol
 .Nm
 .Op Fl M Ar core
 .Op Fl N Ar system
 .Op Fl p Ar protocol
 .Fl P Ar pcbaddr
 .Nm
 .Op Fl i
 .Op Fl I Ar Interface
 .Op Fl p Ar protocol
 .Nm
 .Op Fl is
 .Op Fl f Ar address_family
 .Op Fl I Ar Interface
 .Nm
 .Op Fl s
 .Op Fl I Ar Interface
 .Fl B
 .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.
 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.
 Using the third form, with a
 .Ar wait
 interval specified,
 .Nm
 will continuously display the information regarding packet
 traffic on the configured network interfaces.
 The fourth form displays statistics about the named protocol.
 The fifth and sixth forms display per interface statistics for
 the specified protocol or address family.
 .Pp
 The options have the following meaning:
 .Bl -tag -width flag
 .It Fl A
 With the default display,
 show the address of any protocol control blocks associated with sockets; used
 for debugging.
 .It Fl a
 With the default display,
 show the state of all sockets; normally sockets used by
 server processes are not shown.
 .It Fl B
 With the default display,
 show the current
 .Xr bpf 4
 peers.
 To show only the peers listening to a specific interface,
 use the
 .Fl I
 option.
 If the
 .Fl s
 option is present, show the current
 .Xr bpf 4
 statistics.
 .It Fl b
 With the interface display (option
 .Fl i ) ,
 show bytes in and out, instead of packets in and out.
 .It Fl d
 With either interface display (option
 .Fl i
 or an interval, as described below),
 show the number of dropped packets.
 .It Fl f Ar address_family
 Limit statistics or address control block reports to those
 of the specified
 .Ar address_family  .
 The following address families
 are recognized:
 .Ar inet ,
 for
 .Dv AF_INET ;
 .Ar inet6 ,
 for
 .Dv AF_INET6 ;
 .Ar arp ,
 for
 .Dv AF_ARP ;
 .Ar ns ,
 for
 .Dv AF_NS ;
 .Ar iso ,
 for
 .Dv AF_ISO ;
 .Ar atalk ,
 for
 .Dv AF_APPLETALK ;
 and
 .Ar local
 or
 .Ar unix ,
 for
 .Dv AF_LOCAL .
 .It Fl g
 Show information related to multicast (group address) routing.
 By default, show the IP Multicast virtual-interface and routing tables.
 If the
 .Fl s
 option is also present, show multicast routing statistics.
 .It Fl I Ar interface
 Show information about the specified interface;
 used with a
 .Ar wait
 interval as described below.
 If the
 .Fl f Ar address_family
 option (with the
 .Fl s
 option) or the
 .Fl p Ar protocol
 option is present, show per-interface statistics on the
 .Ar interface
 for the specified
 .Ar address_family
 or
 .Ar protocol ,
 respectively.
 .It Fl 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).
 If the
 .Fl a
 options 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 the
 .Fl f Ar address_family
 option (with the
 .Fl s
 option) or the
 .Fl p Ar protocol
 option is present, show per-interface statistics on all interfaces
 for the specified
 .Ar address_family
 or
 .Ar protocol ,
 respectively.
 .It Fl L
 Don't show link-level routes (e.g., IPv4 ARP or IPv6 neighbour cache).
 .It Fl M
 Extract values associated with the name list from the specified core
 instead of the default
 .Pa /dev/kmem .
 .It Fl m
 Show statistics recorded by the memory management routines
 (the network manages a private pool of memory buffers).
 .It Fl N
 Extract the name list from the specified system instead of the default
 .Pa /netbsd .
 .It Fl n
 Show network addresses and ports as numbers (normally
 .Nm
 interprets addresses and ports and attempts to display them
 symbolically).
 This option may be used with any of the display formats.
 .It Fl P Ar pcbaddr
 Dump the contents of the protocol control block (PCB) located at kernel
 virtual address
 .Ar pcbaddr .
 This address may be obtained using the
 .Fl A
 flag.
 The default protocol is TCP, but may be overridden using the
 .Fl p
 flag.
 .It Fl p Ar protocol
 Show statistics about
 .Ar protocol  ,
 which is either a well-known name for a protocol or an alias for it.
 Some protocol names and aliases are listed in the file
 .Pa /etc/protocols .
 A null response typically means that there are no interesting numbers to
 report.
 The program will complain if
 .Ar protocol
 is unknown or if there is no statistics routine for it.
 .It Fl q
 Show software interrupt queue setting/statistics for all protocols.
 .It Fl r
 Show the routing tables.
 When
 .Fl s
 is also present, show routing statistics instead.
 .It Fl S
 Show network addresses as numbers (as with
 .Fl n ,
 but show ports symbolically).
 .It Fl s
 Show per-protocol statistics.
 If this option is repeated, counters with a value of zero are suppressed.
 .It Fl v
 Show extra (verbose) detail for the routing tables
 .Pq Fl r ,
 or avoid truncation of long addresses.
 .It Fl w Ar wait
 Show network interface statistics at intervals of
 .Ar wait
 seconds.
 .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 ``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
 .Pa /etc/hosts
 and
 .Pa /etc/networks ,
 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 ``dot format,''
 refer to
 .Xr inet 3 ) .
 Unspecified,
 or ``wildcard'', addresses and ports appear as ``*''.
 You can use the
 .Xr fstat 1
 to find out which process or processes hold references to a socket.
 .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 (``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 XXXX RTF_BLACKHOLE
 .It 1	RTF_PROTO1	Protocol specific routing flag #1
 .It 2	RTF_PROTO2	Protocol specific routing flag #2
 .It B	RTF_BLACKHOLE	Just discard pkts (during updates)
 .It C	RTF_CLONING	Generate new routes on use
 .It c	RTF_CLONED	Cloned routes (generated from RTF_CLONING)
 .It D	RTF_DYNAMIC	Created dynamically (by redirect)
 .It G	RTF_GATEWAY	Destination requires forwarding by intermediary
 .It H	RTF_HOST	Host entry (net otherwise)
 .It L	RTF_LLINFO	Valid protocol to link address translation.
 .It M	RTF_MODIFIED	Modified dynamically (by redirect)
 .It R	RTF_REJECT	Host or net unreachable
 .It S	RTF_STATIC	Manually added
 .It U	RTF_UP	Route usable
 .It X	RTF_XRESOLVE	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 mtu entry shows the mtu associated with
 that route.
 This mtu value is used as the basis for the TCP maximum
 segment size.
 The 'L' flag appended to the mtu value indicates that
 the value is locked, and that path mtu discovery is turned off for
 that route.
+A
 .Sq -
 indicates that the mtu for this route has not been set, and a default
 TCP maximum segment size will be used.
 The interface entry indicates
 the network interface used 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.
 This display consists of a column for the primary interface (the first
 interface found during autoconfiguration) and a column summarizing
 information for all interfaces.
 The primary interface may be replaced with another interface with the
 .Fl I
 option.
 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.
 .Pp
 The first character of the flags column in the
 .Fl B
 option shows the status of the
 .Xr bpf 4
 descriptor which has three different values:
 Idle ('I'), Waiting ('W') and Timed Out ('T').
-The second character indicates wheter the promisc flag is set.
+The second character indicates whether the promisc flag is set.
 The third character indicates the status of the immediate mode.
 The fourth character indicates whether the peer will have the ability
 to see the packets sent.
 And the fifth character shows the header complete flag status.
 .Sh SEE ALSO
 .Xr fstat 1 ,
 .Xr nfsstat 1 ,
 .Xr ps 1 ,
 .Xr sockstat 1 ,
 .Xr vmstat 1 ,
 .Xr inet 3 ,
 .Xr bpf 4 ,
 .Xr hosts 5 ,
 .Xr networks 5 ,
 .Xr protocols 5 ,
 .Xr services 5 ,
 .Xr iostat 8 ,
 .Xr trpt 8
 .Sh HISTORY
 The
 .Nm
 command appeared in
 .Bx 4.2 .
 IPv6 support was added by WIDE/KAME project.
 .\" .Sh FILES
 .\" .Bl -tag -width /dev/kmem -compact
 .\" .It Pa /netbsd
 .\" default kernel namelist
 .\" .It Pa /dev/kmem
 .\" default memory file
 .\" .El
 .Sh BUGS
 The notion of errors is ill-defined.