bsnmpd: ifTable and if_nametoindex() inconsistency

[Eugene Grosbein]

On 23.01.2011 00:24, Eugene Grosbein wrote:
> Hi!
> 
> I run 8.2-PRERELEASE with bsnmpd and mpd55 serving PPPoE users.
> I've noticed that sometimes snmpwalk shows interface indexes
> that partially differ from what if_nametoindex(3) returns
> with off-by-one or off-by-two. For example, just now this server has
> 813 connected PPPoE sessions (interfaces named ngXXXX)
> and SNMP returns wrong indexes for 567 out of them, starting from ng334.
> 
> I've restarted bsnmpd but this made it worse: now all dynamic ngXXXX
> interfaces have obtained new indexes in SNMP ifTable and no one
> equals to if_nametoindex(name).
> 
> Aren't these indexes supposed to be equal?

Now I see from snmp_mibII.3 they are not :-(

> I really need quick method to obtain SNMP index within mpd55 code
> (for my local mpd hacks) and if_nametoindex() used to seem nice way...
> I need to export indexes via mpd's web interface so that they may be
> checked remotely using SNMP.

Still wondering how to get SNMP index without way too slow walking ifTable over...

Eugene Grosbein