Last updated: Fri, 22 Aug 2008

snmpwalk

(PHP 4, PHP 5)

snmpwalk — Busqueda por un arbol de información acerca de un entidad de red

Descripción

array snmpwalk ( string $hostname , string $community , string $object_id [, int $timeout [, int $retries ]] )

Devuelve una matriz de valores de objetos SMNP comenzando por el object_id() como raíz y FALSE en caso de error.

La función snmpwalk() es usada para leer todos los valores de un agente SNMP especificado por el hostname . Community especifica la comunidad lectora para el agente. Un object_id nulo se toma como la raíz del arbol de los objetos SNMP y todos los objetos por debajo de ese arbol son devueltos como una matriz. Si object_id es especificado, todos los objetos SNMP por debajo de object_id son devueltos.


$a = snmpwalk("127.0.0.1", "public", "");

Encima de una función de llamada podrían devolverse todos los objetos SNMP del agente SNMP en ejecución en el servidor local. Uno puede pasar por todos los valores con un bucle.


for ($i=0; $i<count($a); $i++) {
    echo $a[$i];
}

snmpwalkoid

snmpset

Last updated: Fri, 22 Aug 2008

add a note User Contributed Notes
snmpwalk

http://mike.eire.ca
23-Mar-2005 07:54


I found on Windows (PHP 5) an empty string did not return anything, it just timed out.  I had to use null instead:



<?php

$a = snmpwalk("127.0.0.1", "public", null);

?>

bobby [dot] clark [at] eku [dot] edu
17-Sep-2003 11:29


I had to use an object_id like these.

'SNMPv2-MIB::system.sysDescr.0'

'IF-MIB::interfaces.ifTable.ifEntry.ifAdminStatus'



<?php

$host = '192.168.1.1';

$community = 'public';

$object_id = 'IF-MIB::interfaces.ifTables.ifEntry.ifAdminStatus';



$sysdesc = snmpwalk($host, $community', $object_id);

print_r($sysdesc);

?>

Lars Troen
14-Mar-2003 12:18


Note that there's different behaviuor in php snmpwalk and ucd snmpwalk. If you try to walk an oid that has one value not under a subkey of the walked oid, ucd snmpwalk will return the value while php's snmpwalk will not.

anders at ei dot nu
29-Jan-2003 07:11


It would be nice to be able to specify what snmp version to use ( 1,2c,3 )



For now, I'ts hardcoded in ext/snmp/snmp.c



change session.version from 1 to 2c or 3 if you need for now..



i.e 



session.version = SNMP_VERSION_1;



to:

session.version = SNMP_VERSION_2c;

steve at ourabode dot org
26-Mar-2002 12:54


Timeout is in MICRO seconds.

1,000,000 &micros = 1 s

layer2 at www dot com
29-Aug-2001 05:52


Something to care about in dealing with snmpwalk:<BR>






While walking the MIB, snmpwalk puts info that gets into an array, and that is correct.<BR>






The trouble happened when snmpwalk needs to collect information from instances that contains subinstances (i.e. walking .1.2.3.4.5 and having instances like 1.1, 1.2, 1.3): in this case it gets info and passes into an array, but when walking the array, each value is preceeded by 'Counter32: '.<BR>






I've tested this in many ways and it always happened the same way.

john at antefacto dot com
17-Aug-2001 05:21


Ah. That's why all of our SNMP stuff was timing out anytime there was any load on the system. Sigh. A waste of two weeks trying to debug snmp....





 Even the snmpcmd manpage doesn't give a


unit for timeout.

billf at freebsd dot org
01-Aug-2001 11:22


for the poster wondering what the


timeout field was measured in:





from the ucd-snmp header file snmp_api.h:





    long    timeout; 


    /* Number of uS until first timeout


    then exponential backoff */

jmartinson(AT_nospam)info234.com
20-Jun-2001 04:41


A quick router device view:





<?


include "header.html";





$host = "auscr1";


$community = "tellme";


                     


$sysDescr = snmpget("$host","$community","system.sysDescr.0");


$ifDescr = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifDescr");


$ifIndex = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifIndex");


$ifAdminStatus = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifAdminStatus");


$ifOperStatus = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifOperStatus");


$ifLastChange = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifLastChange");


                                          


print "<table border=1 bgcolor=#ffffff><tr><td>$host</td></tr></table><br>";


print "<table border=1 bgcolor=#ffffff><tr><td>$sysDescr</td></tr></table><br>";


print "<table border=1 bgcolor=#ffffff>";


print "<tr> 


        <td>ifIndex</td>


        <td>ifDescr</td>


        <td>ifAdminStatus</td>


        <td>ifOperStatus</td>


        <td>ifLastChange</td>


        </tr>";


             


for ($i=0; $i<count($ifIndex); $i++) {


        print "<tr>";


        print "<td>$ifIndex[$i]</td>";


        print "<td>$ifDescr[$i]</td>";


        print "<td>$ifAdminStatus[$i]</td>";


        print "<td>$ifOperStatus[$i]</td>";


        print "<td>$ifLastChange[$i]</td>";


        print "</tr>";


}            


print "</table>";





?>

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snmpwalkoid

snmpset

Last updated: Fri, 22 Aug 2008