Delicious Bookmark this on Delicious Share on Facebook SlashdotSlashdot It! Digg! Digg

PHP : Function Reference : SNMP Functions : snmpget


Fetch an SNMP object (PHP 4, PHP 5)
string snmpget ( string hostname, string community, string object_id [, int timeout [, int retries]] )

Example 2266. Using snmpget()

= snmpget("", "public", "system.SysContact.0");

Code Examples / Notes » snmpget

malaka udawatta malaka13

When I try to get a 64 bit counter variable (e.g. ifHCInOctets) using snmpget function, following error message was appeared.
Error in packet: (noSuchName) There is no such variable name in this MIB
The solution for this is to use snmp2_get(); function. The prameters are same as snmpget();


Unfortunately, It appears that you can not put multiple objects into the snmpget function, ie: sysUpTime.0 ifInOctets.1 ifOutOctets.1.  For what it's worth, the time argument is in nano-seconds as previously mentioned.  There is a lot of conflicting information out there about this.


The timeout is in micro seconds. Thus 1.000.000 means 1 Second.


The online documentation says that the function returns "FALSE" on error but, actually, it returns NULL on error.


The default value of Timeout is 1000000  nanoseconde (1 sec) and the retrie is 5 thsi value is set by Net-SNMP library.
$time_start = microtime(true);
$reponse = snmpget('', 'public', "",1000000,5);
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "Delay in $time secondes\n";


pooling a cisco.
$ip = '';
$community ='publico';
$a = snmpget($ip,$community, "IF-MIB::ifLastChange.1")
$b = snmpget($ip,$community, "IF-MIB::ifAlias.1");
print("a = ".$a."\n"."b = ".$b."\n");
a = Timeticks: (929969969) 107 days, 15:14:59.69
b = Timeticks: (929969969) 107 days, 15:14:59.69
when the interface has not description.


Little tidbit for snmpget function
//snmpget system stats
$host = 'localhost';
$community = 'public';
//get system name
$sysname = snmpget($host, $community, "system.sysName.0");
//get system uptime
$sysup = snmpget($host, $community, "system.sysUpTime.0");
$sysupre = eregi_replace("([0-9]{3})","",$sysup);
$sysupre2 = eregi_replace("Timeticks:","",$sysupre);
$sysupre3 = eregi_replace("[()]","",$sysupre2);
//get tcp connections
$tcpcon = snmpget($host, $community,"tcp.tcpCurrEstab.0");
$tcpconre = eregi_replace("Gauge32:","",$tcpcon);
echo '
System Name: '.$sysname.'
System Uptime: '.$sysupre3.'
Current Tcp Connections: '.$tcpconre.'

johann glaser

It seems that for each snmpget() its own socket() will be opened. This is not closed after snmpget() finishes. Neither existing sockets are reused by subsequent snmpget() calls.
When querying a few switches with lots of ports the maximum file descriptor count of Apache is exhausted. Thus no more snmpget() are possible. Additionaly no more files can be read by this particular Apache process. Neither the PHP file, any include files nor any other files (like a .css file, ...).
This probably explains the observation of tkjode at phalnet dot com. Different to his case is that I'm using Linux.


It looks like you can use a non-standard port for SNMP
with something like this:
$foo = snmpwalk('', 'foofoo', '.1.3.6');
This is on PHP 3.16; I haven't managed to get PHP 4.02 to compile successfully on Solaris 2.6 yet.


It has been observed on NT/2000 systems that flooding devices with SNMP requests will cause NT's SNMP service to stop working.
For example, I polled 183 switches on our network just fine.  I then attempted to simulate heavy traffic to that page by refreshing and breaking connections (as any real world system would have to go through).  SNMP stopped working throughout the entire machine, including non-PHP/Webserver processes.


I think it's MILLIseconds.
1000 ms =  1 sec

michael dot mauch

I have no idea what the timeout value is, but 1 second is really really 1 000 000 000 nano seconds (cf.


According the SNMPv2-MIB DEFINITIONS the right syntax should be "system.sysContact.0" and NOT "system.SysContact.0" as used in the above example 2251.
sysContact OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-write
STATUS current
"The textual identification of the contact person for this
managed node, together with information on how to contact
this person. If no contact information is known, the
is the zero-length string."
::= { system 4 }


about timeouts it turns out to be in nanoseconds e.g. for 1 second use value of 1 000 000


2 year tidbit update :)
// author: dstjohn at
// updated: 09-11-2005
// set some vars
$snmpcommunity = 'PUBLIC'; //snmp community name
$ips = ','; //ips or dns to get snmp data from
$system_number = '1';
//end da vars
//start da loop d loop
for ($i = 0; $i <= $system_number; $i++) {
$sysip = explode(",",$ips);
//get system name
$sysname[0] = snmpget($sysip[$i], $snmpcommunity, "sysName.0");
$sysname[1] = eregi_replace("STRING:","",$sysname[0]);
echo 'System Name: '.$sysname[1].'
//system description
$sysdesc[0] = snmpget($sysip[$i], $snmpcommunity, "sysDescr.0");
$sysdesc[1] = eregi_replace("STRING:","",$sysdesc[0]);
echo 'System Description: '.$sysdesc[1].'
//system location
$sysloc[0] = snmpget($sysip[$i], $snmpcommunity, "sysLocation.0");
$sysloc[1] = eregi_replace("STRING:","",$sysloc[0]);
echo 'System Location: '.$sysloc[1].'
//current tcp connections
$tcpcons[0] = snmpget($sysip[$i], $snmpcommunity, "tcpCurrEstab.0");
$tcpcons[1] = eregi_replace("Gauge32:","",$tcpcons[0]);
echo 'Open TCP/IP Connections: '.$tcpcons[1].'
//get system uptime
$sysuptime[0] = snmpget($sysip[$i], $snmpcommunity, "system.sysUpTime.0");
$sysuptime[1] = eregi_replace("Timeticks:","",$sysuptime[0]);
echo 'System Uptime: Timeticks -'.$sysuptime[1].'
//windows only
//installed memory
$mem[0] = snmpget($sysip[$i], $snmpcommunity, "HOST-RESOURCES-MIB::hrMemorySize.0");
$mem[1] = eregi_replace("INTEGER:","",$mem[0]);
$mem[2] = eregi_replace("KBytes","",$mem[1]);
echo 'Insalled Memory: '.$mem[2].' KiloBytes
echo '
}//end loop

Change Language

Follow Navioo On Twitter
eXTReMe Tracker