SNMPNETSTAT(1C)SNMPNETSTAT(1C)NAME
snmpnetstat - show network status using SNMP
SYNOPSIS
snmpnetstat [-an] [-c community] host
snmpnetstat [-inrs] [-c community] host
snmpnetstat [-n] [-I interface] [-c community] host [interval]
snmpnetstat [-p protocol] [-c community] host [interval]
DESCRIPTION
The snmpnetstat command 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 upon the options for
the information to be 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.
The host specification may be either a host name or an internet address
specified in ``dot notation''.
The options have the following meaning:
-a With the default display, show the state of all sockets;
normally sockets used by server processes are not shown.
-c community
Set the community name to use in the SNMP transactions. If no
community is specified, ``public'' is used.
-i Show the state of all of the interfaces.
-I interface
Show information only about this interface; used with an
interval as described below.
-n 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.
-p 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 there are no interesting numbers to report. The
program will complain if protocol is unknown or if there is no
statistics routine for it.
-s Show per-protocol statistics.
-r Show the routing tables. When -s is also present, show routing
statistics instead.
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 -n 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 interface. 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 by specifying the -I 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.
SEE ALSOhosts(5), iostat(1), networks(5), protocols(5), services(5), snmp(1),
snmpd(8), vm_stat(1), RFC1067
BUGS
The notion of errors is ill-defined.
4.2 Berkeley Distribution September 17, 1989 SNMPNETSTAT(1C)
