NAME
snmpnetstat - display networking status and configuration information
from a network entity via SNMPSYNOPSIS
ssnnmmppnneettssttaatt [common options] [-a] [-n] AGENT
ssnnmmppnneettssttaatt [common options] [-iorns] AGENT
ssnnmmppnneettssttaatt [common options] [-in] [-I interface] AGENT [interval]
ssnnmmppnneettssttaatt [common options] [-an] [-s] [-P protocol] AGENT
DESCRIPTION
The ssnnmmppnneettssttaatt command symbolically displays the values of variousnetwork-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 valuesof 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. AGENT identifies a target SNMP agent, which is instrumented to monitorthe 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 161of the given target host. See snmpcmd(1) for a full list of the possi-
ble formats for AGENT. OOPPTTIIOONNSS The options have the following meaning: ccoommmmoonn ooppttiioonnss Please see snmpcmd(1) for a list of possible values for common options as well as their descriptions.-aa With the default display, show the state of all sockets; normally
sockets used by server processes are not shown.-ii 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 theinterface and the maximum transmission unit (``mtu'') are also dis-
played.-oo Show an abbreviated interface status, giving octets in place of
packets. This is useful when enquiring virtual interfaces (such asFrame-Relay circuits) on a router.
-II interface Show information only about this interface; used with an
interval as described below.-nn 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.-PP protocol Show statistics about protocol, which is either a well-
known name for a protocol or an alias for it. Some protocol names andaliases 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.-ss Show per-protocol statistics. When used with the -rr option, show
routing statistics instead.-rr Show the routing tables. When -ss is also present, show per-protocol
routing statistics instead of the routing tables.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 ``net-
work.port'' if a socket's address specifies a network but no spe-
cific 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 isunknown, or if the -nn option is specified, the address is printed
numerically, according to the address family. For more informationregarding the Internet ``dot format,'' refer to inet(3N). Unspeci-
fied, or ``wildcard'', addresses and ports appear as ``*''. The Interface Display The interface display provides a table of cumulative statisticsregarding 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 agateway to use in forwarding pack- ets. The flags field shows the
state of the route (``U'' if ``up''), whether the route is to agateway (``G''), whether the route was created dynamically by a re-
direct (``D''), and whether the route has been modified by a redi-
rect (``M''). Direct routes are created for each interface attached to the local host; the gateway field for such entriesshows the address of the outgoing inter- face. The interface entry
indicates the network interface utilized for the route. The Interface Display with an IntervalWhen 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 interfacemay be replaced with another interface with the -II 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 ProtocolWhen a protocol is specified with the -PP 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. EEXXAAMMPPLLEESSExample of using snmpnetstat to displaly active sockets (default):
% snmpnetstat -v 2c -c public -a 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 -i 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 0Example of using snmpnetstat to show statistics about a specific proto-
col:% snmpnetstat -v 2c -c public -P 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 *.* LISTENSEE ALSO
snmpcmd(1), iostat(1), vmstat(1), hosts(5), networks(5), protocols(5), services(5).BUGS
The notion of errors is ill-defined.
4.2 Berkeley Distribution 25 Oct 2003 SNMPNETSTAT(1)