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Power 6/32 Unix version 1.21

.TH NSTAT 8C "18 November 1984"
.UC 4
.SH NAME
nstat \- show network status
.SH SYNOPSIS
.B nstat
[ 
.B \-Achimnrst
.] [
.B \-d
.I device-name
] [
.B \-p
.I protocol 
] [
.B  \-a
.I interval
] [
.I system
] [
.I core
]
.SH DESCRIPTION
.I Nstat 
displays the snapshot of networking subsystem status. The user can use the
statistics collected at the network interfaces, at each
protocol layer, and at network memory pool to monitor the workload,
reliability and throughput of data communication.
.PP
Displayed 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
.I /etc/hosts
and
.IR /etc/networks ,
respectively. If a symbolic name for an address is unknown, or if
the 
.B \-n
option is specified, the address is printed in the Internet ``dot format'';
refer to 
.IR inet (3N)
for more information regarding this format.
Unspecified,
or 
.I wildcard, 
addresses and ports appear as ``*''.  
.PP
The user can choose certain status or statistics, or a different display 
format by specifying a combination of the following options:
.TP 
.B \-A
show the address of protocol control blocks of all connections; used mainly
for debugging the networking subsystem.
.TP
.B \-a interval
specify
.I nstat
to continuously display the selected status, pausing for
.I interval
seconds before between each display.
.TP
.B \-c
show all connections in the system.
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.
.TP
.B \-d "device-name"
show statistics collected at the network interface device;
.I ace
is the device name for ACC Ethernet interface.
.TP
.B \-h
show the state of the IMP host table.
.TP
.B \-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).
The 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.
.TP
.B \-m
show statistics recorded by the 
.I mbuf
memory management routines
(the network manages a ``private share'' of memory)
.TP
.B \-n
show network addresses as numbers (normally 
.I nstat
interprets addresses and attempts to display them
symbolically)
.TP
.BI \-p " proto"
show only connections or statistics relating to the protocol
.IR proto ;
the protocol is specified symbolically, and may be any
protocol listed in the file
.IR /etc/protocols .
If this option is not given,
.I nstat
displays connections or statistics of all protocols.
.TP
.B \-r
show the routing tables.
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.
.TP
.B \-s
show statistics of routing and all protocols.
.TP
.B \-t
show the information regarding packet traffic on the configured
network interfaces, pausing every 1 second. The user can change the pause 
interval with the option
.I -a.
.I Nstat
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.
.PP
The arguments
.I system,
and
.I core
are 
.I positional
driven.
.I System
and
.I core
allow substitutes for the defaults ``/vmunix'' and ``/dev/kmem''.
The
.I core
file must be read with physical addresses rather than virtual addresses.
.PP
.SH SEE ALSO
iostat(1),
vmstat(1),
hosts(5),
networks(5),
protocols(5),
services(5),
trpt(8C)
.SH BUGS
The notion of errors is ill-defined.  Collisions mean
something else for the IMP.

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