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SNMPNETSTAT(1) Net-SNMP SNMPNETSTAT(1)
NAME
snmpnetstat - display networking status and configuration information from a network en-
tity via SNMP
SYNOPSIS
snmpnetstat [COMMON OPTIONS] [-Ca] [-Cn] [-Cv] [-Cf address_family] AGENT
snmpnetstat [COMMON OPTIONS] [-Cr] [-Cn] [-Cv] [-Cf address_family] AGENT
snmpnetstat [COMMON OPTIONS] [-Ci] [-C o | b | d] [-Cn] [-Cv] [-CI interface] [-Cw inter-
val] AGENT
snmpnetstat [COMMON OPTIONS] [-Cs[s]] [-Cp protocol] AGENT
DESCRIPTION
The snmpnetstat command symbolically displays the values of various network-related infor-
mation retrieved from a remote system using the SNMP protocol. There are a number of out-
put formats, depending on the options for the information presented. The first form of
the command displays a list of active sockets. The second form presents the values of
other network-related information according to the option selected. Using the third form,
with an interval specified, snmpnetstat will continuously display the information regard-
ing packet traffic on the configured network interfaces. The fourth form displays statis-
tics about the named protocol.
snmpnetstat will issue GETBULK requests to query for information if at least protocol ver-
sion v2 is used.
AGENT identifies a target SNMP agent, which is instrumented to monitor the given objects.
At its simplest, the AGENT specification will consist of a hostname or an IPv4 address. In
this situation, the command will attempt communication with the agent, using UDP/IPv4 to
port 161 of the given target host. See snmpcmd(1) for a full list of the possible formats
for AGENT.
OPTIONS
The options have the following meaning:
COMMON OPTIONS
Please see snmpcmd(1) for a list of possible values for common options as well as their
descriptions.
-CL use the legacy SNMP MIB elements, not the modern IP version agnostic tables. snmpnet-
stat will automatically fall back to the legacy tables if the modern ones are not avail-
able.
-Ca With the default display, show the state of all sockets; normally sockets used by
server processes are not shown.
-Cf address_family Only show entries for the selected address family (inet, inet6)
-Ci Show the state of all of the network interfaces. The interface display provides a ta-
ble of cumulative statistics regarding packets transferred, errors, and collisions. The
network addresses of the interface and the maximum transmission unit (``mtu'') are also
displayed.
-Cd Add dropped packets to the interface display.
-Cb Show an extended interface status, giving octets in addition to packets.
-Co Show an abbreviated interface status, giving octets in place of packets. This is use-
ful when enquiring virtual interfaces (such as Frame-Relay circuits) on a router.
-CI interface Show information only about this interface; used with an interval as de-
scribed below.
-Cn Show network addresses as numbers (normally snmpnetstat interprets addresses and at-
tempts to display them symbolically). This option may be used with any of the display
formats.
-Cv Allow long host or service names to break the columnar output. This option may be
used with any of the display formats.
-Cp protocol Show statistics about protocol, which is either a well-known name for a pro-
tocol or an alias for it. Some protocol names and aliases are listed in the file
/etc/protocols. A null response typically means that there are no interesting numbers to
report. The program will complain if protocol is unknown or if there is no statistics
routine for it.
-Cs Show per-protocol statistics. If this is duplicated (-Css) statistics entries which
are zero will be suppressed.
-Cr Show the routing tables.
-CR repeaters For GETBULK requests, repeaters specifies the max-repeaters value to use.
When snmpnetstat is invoked with an interval argument, it displays a running count of sta-
tistics related to network interfaces. interval is the number of seconds between report-
ing of statistics.
The Active Sockets Display (default)
The default display, for active sockets, shows the local and remote addresses, 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
databases /etc/hosts and /etc/networks, respectively. If a symbolic name for an address
is unknown, or if the -Cn option is specified, the address is printed numerically, accord-
ing to the address family. For more information regarding the Internet ``dot format,''
refer to inet(3N). Unspecified, or ``wildcard'', addresses and ports appear as ``*''.
The Interface Display
The interface display provides a table of cumulative statistics regarding packets trans-
ferred, errors, and col- lisions. The network addresses of the interface and the maximum
transmission unit (``mtu'') are also displayed.
The Routing Table Display
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 pack- ets.
The flags field shows the state of the route (``U'' if ``up''), whether the route is to a
gateway (``G''), whether the route was created dynamically by a redirect (``D''), and
whether the route has been modified by a redirect (``M''). Direct routes are created for
each interface attached to the local host; the gateway field for such entries shows the
address of the outgoing inter- face. The interface entry indicates the network interface
utilized for the route.
The Interface Display with an Interval
When snmpnetstat is invoked with an interval argument, it displays a running count of sta-
tistics related to network interfaces. This display consists of a column for the primary
interface and a column summarizing information for all interfaces. The primary interface
may be replaced with another interface with the -CI 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.
The Active Sockets Display for a Single Protocol
When a protocol is specified with the -Cp option, the information displayed is similar to
that in the default display for active sockets, except the display is limited to the given
protocol.
EXAMPLES
Example of using snmpnetstat to display active sockets (default):
% snmpnetstat -v 2c -c public -Ca testhost
Active Internet (tcp) Connections (including servers)
Proto Local Address Foreign Address (state)
tcp *.echo *.* LISTEN
tcp *.discard *.* LISTEN
tcp *.daytime *.* LISTEN
tcp *.chargen *.* LISTEN
tcp *.ftp *.* LISTEN
tcp *.telnet *.* LISTEN
tcp *.smtp *.* LISTEN
...
Active Internet (udp) Connections
Proto Local Address
udp *.echo
udp *.discard
udp *.daytime
udp *.chargen
udp *.time
...
% snmpnetstat -v 2c -c public -Ci testhost
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Queue
eri0 1500 10.6.9/24 testhost 170548881 245601 687976 0 0
lo0 8232 127 localhost 7530982 0 7530982 0 0
Example of using snmpnetstat to show statistics about a specific protocol:
% snmpnetstat -v 2c -c public -Cp tcp testhost
Active Internet (tcp) Connections
Proto Local Address Foreign Address (state)
tcp *.echo *.* LISTEN
tcp *.discard *.* LISTEN
tcp *.daytime *.* LISTEN
tcp *.chargen *.* LISTEN
tcp *.ftp *.* LISTEN
tcp *.telnet *.* LISTEN
tcp *.smtp *.* LISTEN
...
SEE ALSO
snmpcmd(1), iostat(1), vmstat(1), hosts(5), networks(5), protocols(5), services(5).
BUGS
The notion of errors is ill-defined.
V5.9.1 04 Nov 2013 SNMPNETSTAT(1)
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