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 for a full list of the possible formats for AGENT.
oThe options have the following meaning:
With the default display, show the state of all sockets; normally sockets used by server processes are not shown.
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.
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.
Show information only about this interface; used with an interval as described below.
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.
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 WINDIR/system32/drivers/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.
Show per-protocol statistics. When used with the
-Croption, show routing statistics instead. -Cr
Show the routing tables. When
-Csis also present, show per-protocol routing statistics instead of the routing tables. -CRrepeaters
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 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 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.
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"), 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.
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
When a protocol is specified with the
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 ...
All UNIX systems. Windows 8.1. Windows Server 2012 R2. Windows 10. Windows Server 2016. Windows Server 2019. Windows 11. Windows Server 2022.
PTC MKS Toolkit for System Administrators
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PTC MKS Toolkit 10.4 Documentation Build 39.