SNMPNETSTAT(1) Net-SNMP SNMPNETSTAT(1)NAMEsnmpnetstat - display networking status and configuration information
from a network entity via SNMP
SYNOPSISsnmpnetstat [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 interval] AGENT
snmpnetstat [COMMON OPTIONS] [-Cs[s]] [-Cp protocol] AGENT
DESCRIPTION
The snmpnetstat command symbolically displays the values of various
network-related information retrieved from a remote system using the
SNMP protocol. 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. 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 con‐
tinuously display the information regarding packet traffic on the con‐
figured network interfaces. The fourth form displays statistics about
the named protocol.
snmpnetstat will issue GETBULK requests to query for information if at
least protocol version v2 is used.
AGENT identifies a target SNMP agent, which is instrumented to monitor
the given objects. At its simplest, the AGENT specification will con‐
sist 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 possi‐
ble 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 agnos‐
tic tables. snmpnetstat will automatically fall back to the legacy
tables if the modern ones are not available.
-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 table of cumulative statistics regarding packets
transferred, errors, and collisions. The network addresses of the
interface and the maximum transmission unit (``mtu'') are also dis‐
played.
-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 useful 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 described below.
-Cn Show network addresses as numbers (normally snmpnetstat interprets
addresses and attempts 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 protocol or an alias for it. Some protocol names and
aliases are listed in the file /etc/protocols. A null response typi‐
cally means that there are no interesting numbers to report. The pro‐
gram 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) statis‐
tics 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 statistics related to network interfaces. interval is
the number of seconds between reporting 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 sym‐
bolic name for an address is unknown, or if the -Cn option is speci‐
fied, the address is printed numerically, according to the address fam‐
ily. 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 regard‐
ing packets transferred, 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 sta‐
tus. Each route consists of a destination host or network and a gate‐
way 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 statistics related to network interfaces. This dis‐
play consists of a column for the primary interface and a column summa‐
rizing 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 dis‐
played 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 proto‐
col:
% 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 ALSOsnmpcmd(1), iostat(1), vmstat(1), hosts(5), networks(5), protocols(5),
services(5).
BUGS
The notion of errors is ill-defined.
V5.7.3 04 Nov 2013 SNMPNETSTAT(1)
