====== How to fix net-snmp / snmpwalk SNMPv2-PDU error in Debian 9 ======

-- //Tested with **Debian 9 (Stretch)** and **snmp-mibs-downloader 1.1** on **September 2018**// --

When using ''net-snmp'' tools (for example with the tool ''snmpwalk''), Debian 9 users (and Ubuntu users too) often get an error like

  Bad operator (INTEGER): At line 73 in /usr/share/snmp/mibs/ietf/SNMPv2-PDU
  
To fix this issue, you need to hack the SMI file (please note that my modified versions of [[http://pastebin.com/raw.php?i=p3QyuXzZ|SNMPv2-PDU]] is **not** an IETF official file! Use it only if you know what you are doing).
  sudo wget http://pastebin.com/raw.php?i=p3QyuXzZ -O /usr/share/snmp/mibs/ietf/SNMPv2-PDU

If you have a less recent Linux version and/or you are seeing more errors, you would need to update more files. In this case, refer to my [[notes:net-snmp-errors|previous guide on this topic]].