Index: head/usr.bin/netstat/netstat.1
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--- head/usr.bin/netstat/netstat.1	(revision 363395)
+++ head/usr.bin/netstat/netstat.1	(revision 363396)
@@ -1,830 +1,851 @@
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 .\"	@(#)netstat.1	8.8 (Berkeley) 4/18/94
 .\" $FreeBSD$
 .\"
-.Dd March 22, 2018
+.Dd July 21, 2020
 .Dt NETSTAT 1
 .Os
 .Sh NAME
 .Nm netstat
 .Nd show network status and statistics
 .Sh SYNOPSIS
 .Bk -words
 .Bl -tag -width "netstat"
 .It Nm
 .Op Fl -libxo
 .Op Fl 46AaLnPRSTWx
 .Op Fl f Ar protocol_family | Fl p Ar protocol
 .Op Fl M Ar core
 .Op Fl N Ar system
 .It Nm Fl i | I Ar interface
 .Op Fl -libxo
 .Op Fl 46abdhnW
 .Op Fl f Ar address_family
 .Op Fl M Ar core
 .Op Fl N Ar system
 .It Nm Fl w Ar wait
 .Op Fl -libxo
 .Op Fl I Ar interface
 .Op Fl 46d
 .Op Fl M Ar core
 .Op Fl N Ar system
 .Op Fl q Ar howmany
 .It Nm Fl s
 .Op Fl -libxo
 .Op Fl 46sz
 .Op Fl f Ar protocol_family | Fl p Ar protocol
 .Op Fl M Ar core
 .Op Fl N Ar system
 .It Nm Fl i | I Ar interface Fl s
 .Op Fl -libxo
 .Op Fl 46s
 .Op Fl f Ar protocol_family | Fl p Ar protocol
 .Op Fl M Ar core
 .Op Fl N Ar system
 .It Nm Fl m
 .Op Fl -libxo
 .Op Fl M Ar core
 .Op Fl N Ar system
 .It Nm Fl B
 .Op Fl -libxo
 .Op Fl z
 .Op Fl I Ar interface
 .It Nm Fl r
 .Op Fl -libxo
 .Op Fl 46nW
 .Op Fl F Ar fibnum
 .Op Fl f Ar address_family
 .It Nm Fl rs
 .Op Fl -libxo
 .Op Fl s
 .Op Fl M Ar core
 .Op Fl N Ar system
 .It Nm Fl g
 .Op Fl -libxo
 .Op Fl 46W
 .Op Fl f Ar address_family
 .It Nm Fl gs
 .Op Fl -libxo
 .Op Fl 46s
 .Op Fl f Ar address_family
 .Op Fl M Ar core
 .Op Fl N Ar system
 .It Nm Fl Q
 .Op Fl -libxo
 .El
 .Ek
 .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 46AaLnRSTWx
 .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.
 .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 * .
 .Bl -tag -width indent
 .It Fl -libxo
 Generate output via
 .Xr libxo 3
 in a selection of different human and machine readable formats.
 See
 .Xr xo_parse_args 3
 for details on command line arguments.
 .It Fl 4
 Show IPv4 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl 6
 Show IPv6 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl A
 Show the address of a protocol control block (PCB)
 associated with a socket; used for debugging.
 .It Fl a
 Show the state of all sockets;
 normally sockets used by server processes are not shown.
 .It Fl L
 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.
 .It Fl n
 Do not resolve numeric addresses and port numbers to names.
 See
 .Sx GENERAL OPTIONS .
 .It Fl P
 Display the log ID for each socket.
 .It Fl R
 Display the flowid and flowtype for each socket.
 flowid is a 32 bit hardware specific identifier for each flow.
 flowtype defines which protocol fields are hashed to produce the id.
 A complete listing is available in
 .Pa sys/mbuf.h
 under
 .Dv M_HASHTYPE_* .
 .It Fl S
 Show network addresses as numbers (as with
 .Fl n )
 but show ports symbolically.
 .It Fl T
 Display diagnostic information from the TCP control block.
 Fields include the number of packets requiring retransmission,
 received out-of-order, and those advertising a zero-sized window.
 .It Fl W
 Avoid truncating addresses even if this causes some fields to overflow.
 .It Fl x
 Display socket buffer and TCP timer statistics for each
 internet socket.
 .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.
 .It Li rexmt Ta Time, in seconds, to fire Retransmit Timer, or 0 if not armed.
 .It Li persist Ta Time, in seconds, to fire Retransmit Persistence, or 0 if not armed.
 .It Li keep Ta Time, in seconds, to fire Keep Alive, or 0 if not armed.
 .It Li 2msl Ta Time, in seconds, to fire 2*msl TIME_WAIT Timer, or 0 if not armed.
 .It Li delack Ta Time, in seconds, to fire Delayed ACK Timer, or 0 if not armed.
 .It Li rcvtime Ta Time, in seconds, since last packet received.
 .El
 .It Fl f Ar protocol_family
 Filter by
 .Ar protocol_family .
 See
 .Sx GENERAL OPTIONS .
 .It Fl p Ar protocol
 Filter by
 .Ar protocol .
 See
 .Sx GENERAL OPTIONS .
 .It Fl M
 Use an alternative core.
 See
 .Sx GENERAL OPTIONS .
 .It Fl N
 Use an alternative kernel image.
 See
 .Sx GENERAL OPTIONS .
 .El
 .It Xo
 .Bk -words
 .Nm
 .Fl i | I Ar interface
 .Op Fl 46abdhnW
 .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 .
 .Pp
 When
 .Nm
 is invoked with
 .Fl i
 .Pq all interfaces
 or
 .Fl I Ar interface ,
 it 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.
 .Bl -tag -width indent
 .It Fl 4
 Show IPv4 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl 6
 Show IPv6 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl a
 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.
 .It Fl b
 Show the number of bytes in and out.
 .It Fl d
 Show the number of dropped packets.
 .It Fl h
 Print all counters in human readable form.
 .It Fl n
 Do not resolve numeric addresses and port numbers to names.
 See
 .Sx GENERAL OPTIONS .
 .It Fl W
 Avoid truncating interface names even if this causes some fields to overflow.
 .Sx GENERAL OPTIONS .
 .It Fl f Ar protocol_family
 Filter by
 .Ar protocol_family .
 See
 .Sx GENERAL OPTIONS .
 .El
 .It Xo
 .Bk -words
 .Nm
 .Fl w Ar wait
 .Op Fl I Ar interface
 .Op Fl 46d
 .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 .
 .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 Ar interface
 option.
 .Bl -tag -width indent
 .It Fl I Ar interface
 Only show information regarding
 .Ar interface
 .It Fl 4
 Show IPv4 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl 6
 Show IPv6 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl d
 Show the number of dropped packets.
 .It Fl M
 Use an alternative core.
 See
 .Sx GENERAL OPTIONS .
 .It Fl N
 Use an alternative kernel image.
 See
 .Sx GENERAL OPTIONS .
 .It Fl q
 Exit after
 .Ar howmany
 outputs.
 .El
 .It Xo
 .Bk -words
 .Nm
 .Fl s
 .Op Fl 46sz
 .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.
 .Bl -tag -width indent
 .It Fl 4
 Show IPv4 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl 6
 Show IPv6 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl s
 If
 .Fl s
 is repeated, counters with a value of zero are suppressed.
 .It Fl z
 Reset statistic counters after displaying them.
 .It Fl f Ar protocol_family
 Filter by
 .Ar protocol_family .
 See
 .Sx GENERAL OPTIONS .
 .It Fl p Ar protocol
 Filter by
 .Ar protocol .
 See
 .Sx GENERAL OPTIONS .
 .It Fl M
 Use an alternative core.
 See
 .Sx GENERAL OPTIONS .
 .It Fl N
 Use an alternative kernel image
 See
 .Sx GENERAL OPTIONS .
 .El
 .It Xo
 .Bk -words
 .Nm
 .Fl i | I Ar interface Fl s
 .Op Fl 46s
 .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.
 .Bl -tag -width indent
 .It Fl 4
 Show IPv4 only
 See
 .Sx GENERAL OPTIONS .
 .It Fl 6
 Show IPv6 only
 See
 .Sx GENERAL OPTIONS .
 .It Fl s
 If
 .Fl s
 is repeated, counters with a value of zero are suppressed.
 .It Fl f Ar protocol_family
 Filter by
 .Ar protocol_family .
 See
 .Sx GENERAL OPTIONS .
 .It Fl p Ar protocol
 Filter by
 .Ar protocol .
 See
 .Sx GENERAL OPTIONS .
 .It Fl M
 Use an alternative core
 See
 .Sx GENERAL OPTIONS .
 .It Fl N
 Use an alternative kernel image
 See
 .Sx GENERAL OPTIONS .
 .El
 .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.
 .Bl -tag -width indent
 .It Fl M
 Use an alternative core
 See
 .Sx GENERAL OPTIONS .
 .It Fl N
 Use an alternative kernel image
 See
 .Sx GENERAL OPTIONS .
 .El
 .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.
 .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 .
 .Bl -tag -width indent
 .It Fl z
 Reset statistic counters after displaying them.
 .El
 .It Xo
 .Bk -words
 .Nm
 .Fl r
 .Op Fl 46AnW
 .Op Fl F Ar fibnum
 .Op Fl f Ar address_family
 .Op Fl M Ar core
 .Op Fl N Ar system
 .Ek
 .Xc
 Display the contents of routing tables.
 .Pp
 When
 .Nm
 is invoked with the routing table option
 .Fl r ,
 it lists 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 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 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.
 .Bl -tag -width indent
 .It Fl 4
 Show IPv4 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl 6
 Show IPv6 only.
 See
 .Sx GENERAL OPTIONS .
 .It Fl n
 Do not resolve numeric addresses and port numbers to names.
 See
 .Sx GENERAL OPTIONS .
 .It Fl W
 Show the path MTU for each route, and print interface names with a
 wider field size.
 .It Fl F
 Display the routing table with the number
 .Ar fibnum .
 If the specified
 .Ar fibnum
 is -1 or
 .Fl F
 is not specified,
 the default routing table is displayed.
 .It Fl f
 Display the routing table for a particular
 .Ar address_family .
 .It Fl M
 Use an alternative core
 See
 .Sx GENERAL OPTIONS .
 .It Fl N
 Use an alternative kernel image
 See
 .Sx GENERAL OPTIONS .
 .El
 .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.
 .Bl -tag -width indent
 .It Fl s
 If
 .Fl s
 is repeated, counters with a value of zero are suppressed.
 .It Fl M
 Use an alternative core
 See
 .Sx GENERAL OPTIONS .
 .It Fl N
 Use an alternative kernel image
 See
 .Sx GENERAL OPTIONS .
 .El
 .It Xo
 .Bk -words
 .Nm
 .Fl g
 .Op Fl 46W
 .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.
 .Bl -tag -width indent
 .It Fl 4
 Show IPv4 only
 See
 .Sx GENERAL OPTIONS .
 .It Fl 6
 Show IPv6 only
 See
 .Sx GENERAL OPTIONS .
 .It Fl W
 Avoid truncating addresses even if this causes some fields to overflow.
 .It Fl f Ar protocol_family
 Filter by
 .Ar protocol_family .
 See
 .Sx GENERAL OPTIONS .
 .It Fl M
 Use an alternative core
 See
 .Sx GENERAL OPTIONS .
 .It Fl N
 Use an alternative kernel image
 See
 .Sx GENERAL OPTIONS .
 .El
 .It Xo
 .Bk -words
 .Nm
 .Fl gs
 .Op Fl 46s
 .Op Fl f Ar address_family
 .Op Fl M Ar core
 .Op Fl N Ar system
 .Ek
 .Xc
 Show multicast routing statistics.
 .Bl -tag -width indent
 .It Fl 4
 Show IPv4 only
 See
 .Sx GENERAL OPTIONS .
 .It Fl 6
 Show IPv6 only
 See
 .Sx GENERAL OPTIONS .
 .It Fl s
 If
 .Fl s
 is repeated, counters with a value of zero are suppressed.
 .It Fl f Ar protocol_family
 Filter by
 .Ar protocol_family .
 See
 .Sx GENERAL OPTIONS .
 .It Fl M
 Use an alternative core
 See
 .Sx GENERAL OPTIONS .
 .It Fl N
 Use an alternative kernel image
 See
 .Sx GENERAL OPTIONS .
 .El
 .It Xo
 .Bk -words
 .Nm
 .Fl Q
 .Ek
 .Xc
 Show
 .Xr netisr 9
 statistics.
 The flags field shows available ISR handlers:
 .Bl -column ".Li W" ".Dv NETISR_SNP_FLAGS_DRAINEDCPU"
 .It Li C Ta Dv NETISR_SNP_FLAGS_M2CPUID Ta "Able to map mbuf to cpu id"
 .It Li D Ta Dv NETISR_SNP_FLAGS_DRAINEDCPU  Ta "Has queue drain handler"
 .It Li F Ta Dv NETISR_SNP_FLAGS_M2FLOW Ta "Able to map mbuf to flow id"
 .El
 .El
-.Pp
 .Ss GENERAL OPTIONS
 Some options have the general meaning:
 .Bl -tag -width flag
 .It Fl 4
 Is shorthand for
 .Fl f
 .Ar inet
 .Pq Show only IPv4
 .It Fl 6
 Is shorthand for
 .Fl f
 .Ar inet6
 .Pq Show only IPv6
 .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 , sctp , tcp , udp
 .It Cm pfkey Pq Dv PF_KEY
 .Cm pfkey
 .It Cm netgraph , ng Pq Dv AF_NETGRAPH
 .Cm ctrl , data
 .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.
 .El
+.Sh EXAMPLES
+Show packet traffic information (packets, bytes, errors, packet drops, etc) for
+interface re0 updated every 2 seconds and exit after 5 outputs:
+.Bd -literal -offset indent
+$ netstat -w 2 -q 5 -I re0
+.Ed
+.Pp
+Show statistics for ICMP on any interface:
+.Bd -literal -offset indent
+$ netstat -s -p icmp
+.Ed
+.Pp
+Show routing tables:
+.Bd -literal -offset indent
+$ netstat -r
+.Ed
+.Pp
+Same as above, but without resolving numeric addresses and port numbers to
+names:
+.Bd -literal -offset indent
+$ netstat -rn
+.Ed
 .Sh SEE ALSO
 .Xr fstat 1 ,
 .Xr nfsstat 1 ,
 .Xr procstat 1 ,
 .Xr ps 1 ,
 .Xr sockstat 1 ,
 .Xr libxo 3 ,
 .Xr xo_parse_args 3 ,
 .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.