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SNMPNETSTAT


Section: Net-SNMP (1)
Updated: 16 Nov 2006
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NAME

snmpnetstat – display networking status and configuration information from a network entity via SNMP
 

SYNOPSIS

snmpnetstat

[common options] [-Ca] [-Cn] AGENT

snmpnetstat

[common options] [-Ci] [-Co] [-Cr] [-Cn] [-Cs] AGENT

snmpnetstat

[common options] [-Ci] [-Cn] [-CI interface] AGENT [interval]

snmpnetstat

[common options] [-Ca] [-Cn] [-Cs] [-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 continuously display the information regarding packet
traffic on the configured 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
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.

-Ca

With the default display,
show the state of all sockets; normally sockets used by
server processes are not shown.

-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 displayed.

-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.

-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 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. When used with the
-Cr

option, show routing statistics instead.

-Cr

Show the routing tables.
When
-Cs

is also present, show per-protocol routing statistics instead of
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 data bases
/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, according 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 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 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 statistics 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.



 

Index



NAME

SYNOPSIS

DESCRIPTION

OPTIONS

EXAMPLES

SEE ALSO

BUGS



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