SNMPNETSTAT(1)
NAME
snmpnetstat - show network status using SNMP
SYNOPSIS
snmpnetstat hostname community [-airsn] [-I interface] [-p
proto] [interval]
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 infor-
mation 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 inter-
val 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 hostname specification may be either a host name or an
internet address specified in "dot notation".
The version 1 community specifies the community name for
the transaction with the remote system.
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.
-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 snmp-
netstat interprets addresses and attempts to dis-
play 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 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.
-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 symbol-
ically 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 ``wild-
card'', addresses and ports appear as ``*''.
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 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.
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 -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 ALSO
iostat(1) vmstat(1) hosts(5) networks(5) protocols(5)
services(5) cmusnmp(5)variables(5) RFC 1155, RFC 1156,
RFC 1157, SNMP Security Internet Drafts
BUGS
The notion of errors is ill-defined.