logIt Log Around The Clock

Archive for March 2012

SNMP: Mistake of Using Tabular OID in Practice

In General Linux on 20 March 2012 with no comments 850 views

Recently, I retrieve rectifier-related SNMP data from Eltek’s Smartpack Controller. This one has the following rear type where we can connect to the ethernet plug (see the purple area). It is presumably in its default configuration and I can snmpwalk through its corporate specific OIDs (under 12148 tree) to find i.e. output voltage, current, battery [...]

USB WiFi Stick on Beagleboard xM Using wpa_supplicant

In ARM Linux, General Linux, Ubuntu on 7 March 2012 with no comments 795 views

One of the most popular USB WiFi sticks in Indonesian market is TP Link which is actually a Ralink wireless adapter (looking at its vendor ID code). Attaching it using wpa_supplicant without explicit driver assignment will return the following error lines ioctl[SIOCSIWENCODEEXT]: Invalid argument ioctl[SIOCSIWENCODEEXT]: Invalid argument Within minutes it will also crash the system [...]