====== How to fix net-snmp / snmpwalk errors in Debian 7 ======

When using ''net-snmp'' tools (for example with the tool ''snmpwalk''), Debian / Ubuntu users often get errors like

  Bad operator (INTEGER): At line 73 in /usr/share/mibs/ietf/SNMPv2-PDU
  Undefined OBJECT-GROUP (diffServMIBMultiFieldClfrGroup): At line 2195 in /usr/share/mibs/ietf/IPSEC-SPD-MIB
  Undefined OBJECT-GROUP (diffServMultiFieldClfrNextFree): At line 2157 in /usr/share/mibs/ietf/IPSEC-SPD-MIB
  Undefined OBJECT-GROUP (diffServMIBMultiFieldClfrGroup): At line 2062 in /usr/share/mibs/ietf/IPSEC-SPD-MIB
  Unlinked OID in IPATM-IPMC-MIB: marsMIB ::= { mib-2 57 }
  Undefined identifier: mib-2 near line 18 of /usr/share/mibs/ietf/IPATM-IPMC-MIB
  Expected "::=" (RFC5644): At line 493 in /usr/share/mibs/iana/IANA-IPPM-METRICS-REGISTRY-MIB
  Expected "{" (EOF): At line 651 in /usr/share/mibs/iana/IANA-IPPM-METRICS-REGISTRY-MIB
  Bad object identifier: At line 651 in /usr/share/mibs/iana/IANA-IPPM-METRICS-REGISTRY-MIB
  Bad parse of OBJECT-IDENTITY: At line 651 in /usr/share/mibs/iana/IANA-IPPM-METRICS-REGISTRY-MIB

This is due to a combination of errors: some IANA MIBs have been updated since ''snmp-mibs-downloader'' 1.1 was released (see http://www.iana.org/assignments/), and some IETF files are broken.

To fix these issues, firstly let's run
  download-mibs

Now, we need to update a few files (please note that my modified versions of [[http://pastebin.com/raw.php?i=p3QyuXzZ|SNMPv2-PDU]] and [[http://pastebin.com/raw.php?i=gG7j8nyk|PATM-IPMC-MIB]] are **not** IETF official files! Use them only if you know what you are doing).
  sudo wget http://www.iana.org/assignments/ianaippmmetricsregistry-mib/ianaippmmetricsregistry-mib -O /usr/share/mibs/iana/IANA-IPPM-METRICS-REGISTRY-MIB
  sudo wget http://pastebin.com/raw.php?i=p3QyuXzZ -O /usr/share/mibs/ietf/SNMPv2-PDU
  sudo wget http://pastebin.com/raw.php?i=gG7j8nyk -O /usr/share/mibs/ietf/IPATM-IPMC-MIB

The remaining errors
  Undefined OBJECT-GROUP (diffServMIBMultiFieldClfrGroup): At line 2195 in /usr/share/mibs/ietf/IPSEC-SPD-MIB
  Undefined OBJECT-GROUP (diffServMultiFieldClfrNextFree): At line 2157 in /usr/share/mibs/ietf/IPSEC-SPD-MIB
  Undefined OBJECT-GROUP (diffServMIBMultiFieldClfrGroup): At line 2062 in /usr/share/mibs/ietf/IPSEC-SPD-MIB

seem to have been resolved with ''net-snmp'' 5.7.x