Re: question about OCTET STRING encoding within an index
Dave Shield <[email protected]>
| Newsgroups | gmane.network.net-snmp.user |
|---|---|
| Message-ID | <[email protected]> |
On 22 September 2010 21:48, Fulko Hew <[email protected]> wrote: > While testing and reviewing my SNMP test harness I've come > across an instance of a variable with an index I can't explain > (on my Fedora box). > > snmpwalk -v1 -cpublic -On localhost vacmContextName > .1.3.6.1.6.3.16.1.1.1.1.0 = STRING: > > So the index on this column is '.0' (which is defined as an OCTET STRING). > > What I'm confused about is... is the zero: > a) the length of the non-existent NULL string that follows? or > b) is it a string that contains a NULL? It indicates an empty string of length 0 - i.e. the default context, as mentioned in the DESCRIPTION of this object. > ... ISTR that if [a string is] the last variable > in an index list, that the length always is omitted? Incorrect. If a string-based object is the last index, then the length *MAY* be omitted - but that only happens if the index is defined as IMPLIED. This is true for the snmpNotifyTable, but not for the vacmContextTable. > Does this mean that an empty OCTET STRING (or OBJECT IDENTIFIER) > as the last INDEX component is a special case? No - it means that the indexing of the two tables are defined differently. Dave ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Net-snmp-users mailing list [email protected] Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users