SNMPNETSTAT(1)							     Net-SNMP							    SNMPNETSTAT(1)

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  com-
       mand  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 pack-
       ets transferred, errors, and collisions.  The  network addresses of the interface and the maximum transmission unit (``mtu'') are also dis-
       played.

       -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  pro-
       gram 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).   Unspeci-
       fied,  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  net-
       work 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 re-
       direct  (``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  inter-
       face 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.

V5.6								    20 Jan 2010 						    SNMPNETSTAT(1)