Edit report at https://bugs.php.net/bug.php?id=61197&edit=1
ID: 61197 Updated by: lytbo...@php.net Reported by: markn at ieee dot org Summary: SNMPv3 cannot connect after reboot -Status: Open +Status: Not a bug Type: Bug Package: SNMP related -Operating System: Linux +Operating System: Irrelevant PHP Version: Irrelevant -Assigned To: +Assigned To: lytboris Block user comment: N Private report: N New Comment: Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. This is bug in Net-SNMP library: you can try this simple script as a proof that snmpwalk has the same flaw: snmpwalk -v3 -l authNoPriv -a MD5 -u admin -A Password01 192.168.1.1 . >out &;sleep 0.2; /etc/init.d/snmpd restart Basically this engine* stuff should be maintained in SNMP-library itself: php-snmp does not specify (and maintain) these variables at all. Previous Comments: ------------------------------------------------------------------------ [2012-02-27 21:31:22] markn at ieee dot org wrong email address. bad day at the keyboard. ------------------------------------------------------------------------ [2012-02-27 21:17:10] markn at ieee dot org Description: ------------ Under certain conditions, it is not possible to reconnect to a device that has rebooted while using SNMPv3. This happens if a PHP script is connecting with authNoPriv or authPriv. After the device reboots, PHP's SNMPv3 routines do not take note of the modified msgAuthoritativeEngineReboots count and the modified msgAuthoritativeEngineTime values - they continue trying to use the old values, and as a result are never able to communicate after a reboot. During device maintenance, it is often necessary to reboot a device - such as after a firmware upgrade. So this is actually something that is needed. Basically, there needs to be a way to discard existing session information. Test script: --------------- <?php for ( ; ; ) { $result = snmp3_get( "192.168.1.1", "admin", "authNoPriv", "MD5", "Password01", "DES", "ciscocisco", "1.3.6.1.2.1.47.1.1.1.1.2.1", 500000, 0 ); var_dump( $result ); sleep(30); } ?> Expected result: ---------------- Run this script, verify that it successfully reads the data. Reboot the device and see that it is unable to read the data after the device is back up. Use Wireshark to observe that the boot count and time values have changed, but the PHP SNMP routines ignore the new values. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=61197&edit=1
