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1.1 root 1: .TH NSTAT 8C "18 November 1984"
2: .UC 4
3: .SH NAME
4: nstat \- show network status
5: .SH SYNOPSIS
6: .B nstat
7: [
8: .B \-HchimnrstEA
9: .] [
10: .B \-d
11: .I device-name
12: ] [
13: .B \-p
14: .I protocol
15: ] [
16: .B \-a
17: .I interval
18: ] [
19: .I system
20: ] [
21: .I core
22: ]
23: .SH DESCRIPTION
24: .I Nstat
25: displays the snapshot of networking subsystem status. The user can use the
26: statistics collected at the network interfaces, at each
27: protocol layer, and at network memory pool to monitor the workload,
28: reliability and throughput of data communication.
29: .PP
30: Displayed address formats are of the form ``host.port'' or ``network.port''
31: if a socket's address specifies a network but no specific host address.
32: When known the host and network addresses are displayed symbolically
33: according to the data bases
34: .I /etc/hosts
35: and
36: .IR /etc/networks ,
37: respectively. If a symbolic name for an address is unknown, or if
38: the
39: .B \-n
40: option is specified, the address is printed in the Internet ``dot format'';
41: refer to
42: .IR inet (3N)
43: for more information regarding this format.
44: Unspecified,
45: or
46: .I wildcard,
47: addresses and ports appear as ``*''.
48: .PP
49: The user can choose certain status or statistics, or a different display
50: format by specifying a combination of the following options:
51: .TP
52: .B \-H
53: is the HELP function. It shows users all the available options in nstat
54: together with brief explaination.
55: .TP
56: .B \-A
57: show the address of protocol control blocks of all connections; used mainly
58: for debugging the networking subsystem.
59: .TP
60: .B \-a interval
61: specify
62: .I nstat
63: to continuously display the selected status, pausing for
64: .I interval
65: seconds before between each display.
66: .TP
67: .B \-c
68: show all connections in the system.
69: There are a number of display formats, depending on the information
70: presented. The default display, for active sockets, shows the local
71: and remote addresses, send and receive queue sizes (in bytes), protocol,
72: and, optionally, the internal state of the protocol.
73: .TP
74: .B \-d "device-name"
75: show statistics collected at the network interface device;
76: .I ace, ace0 or ace1
77: is valid device name for ACC Ethernet interface, and
78: .I enp, enp0 or enp1
79: is valid device name for CMC Ethernet interface. When a device name is
80: specified without device unit number (ace or enp), the statistics of
81: all the devices of that type are displayed.
82: .TP
83: .B \-h
84: show the state of the IMP host table.
85: .TP
86: .B \-i
87: show the state of interfaces which have been auto-configured
88: (interfaces statically configured into a system, but not
89: located at boot time are not shown).
90: The display provides a table of cumulative
91: statistics regarding packets transferred, errors, and collisions.
92: The network address (currently Internet specific) of the interface
93: and the maximum transmission unit (``mtu'') are also displayed.
94: .TP
95: .B \-m
96: show statistics recorded by the
97: .I mbuf
98: memory management routines
99: (the network manages a ``private share'' of memory)
100: .TP
101: .B \-n
102: show network addresses as numbers (normally
103: .I nstat
104: interprets addresses and attempts to display them
105: symbolically)
106: .TP
107: .BI \-p " proto"
108: show only connections or statistics relating to the protocol
109: .IR proto ;
110: the protocol is specified symbolically, and may be any
111: protocol listed in the file
112: .IR /etc/protocols .
113: If this option is not given,
114: .I nstat
115: displays connections or statistics of all protocols.
116: .TP
117: .B \-r
118: show the routing tables.
119: The routing table display indicates the available routes and
120: their status. Each route consists of a destination host or network
121: and a gateway to use in forwarding packets. The flags field shows
122: the state of the route (``U'' if ``up''), and whether the route
123: is to a gateway (``G''). Direct routes are created for each
124: interface attached to the local host. The refcnt field gives the
125: current number of active uses of the route. Connection oriented
126: protocols normally hold on to a single route for the duration of
127: a connection while connectionless protocols obtain a route then
128: discard it. The use field provides a count of the number of packets
129: sent using that route. The interface entry indicates the network
130: interface utilized for the route.
131: .TP
132: .B \-s
133: show statistics of routing and all protocols.
134: .TP
135: .B \-t
136: show the information regarding packet traffic on the configured
137: network interfaces, pausing every 1 second. The user can change the pause
138: interval with the option
139: .I -a.
140: .I Nstat
141: displays a running count of statistics related to
142: network interfaces. This display consists of a column summarizing
143: information for all interfaces, and a column for the interface with
144: the most traffic since the system was last rebooted. The first
145: line of each screen of information contains a summary since the
146: system was last rebooted. Subsequent lines of output show values
147: accumulated over the preceding interval.
148: .TP
149: .B \-E
150: displays the Internet address and Ethernet address of all the hosts that
151: is currently up in the local network.
152:
153: .PP
154: The arguments
155: .I system,
156: and
157: .I core
158: are
159: .I positional
160: driven.
161: .I System
162: and
163: .I core
164: allow substitutes for the defaults ``/vmunix'' and ``/dev/kmem''.
165: The
166: .I core
167: file must be read with physical addresses rather than virtual addresses.
168: .PP
169: .SH SEE ALSO
170: iostat(1),
171: vmstat(1),
172: hosts(5),
173: networks(5),
174: protocols(5),
175: services(5),
176: trpt(8C)
177: .SH BUGS
178: The notion of errors is ill-defined. Collisions mean
179: something else for the IMP.
180: .PP
181: If a host has two or more interfaces to the same local network, the E option
182: displays the Internet/Ethernet address pair of only one interface of which
183: Ethernet address is maintained in the local host ARPA table at that time.
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