Tracing SNMPD activity

I imagine I'm being stupid this morning but I can't figure this out.  I
appreciate any pointers.

I'm using Net-SNMP v5.1.1 and I have an SNMP subagent that's crapping
out with a segfault but I can't narrow down what object it's handling
when it dies.  I do an snmpwalk and the output ends with:

  Q-BRIDGE-MIB::dot1qTpFdbStatus.0.'...Â..'.14 = INTEGER: mgmt(5)
  Q-BRIDGE-MIB::dot1qTpFdbStatus.0.'...Â..'.15 = INTEGER: mgmt(5)
   Error in packet.
   Reason: (genError) A general failure occured
   Failed object: Q-BRIDGE-MIB::dot1qTpFdbStatus.0.'...Â..'.15

Q-BRIDGE-MIB::dot1qTpFdbStatus.0.'...Â..'.15 is the last TpFdbStatus I
expect (the preceeding list of TpFdbPort ends at 15) so I _think_ my
subagent is being asked for the next item in the MIB, whatever that
might be.  Ethereal shows a GET_NEXT packet with the dot1qTpFdbStatus
OID above.  On an older system that works, the next object retrieved is
IF-MIB::ifName.1 but when I instrument my get_ifName function, it
appears it never gets called.

Looking at http://www.net-snmp.org/docs/man/snmpd.html, it seemed that
the -d option would help me.  But when I do:

   /usr/sbin/snmpd -I -interface -I -icmp -f -d 

(I always do "-I -interface -I -icmp"), I see only:

   create_trap_session() with version 1
   add_trap_session() creating version 1 trap

and no "Dump (in hexadecimal) the sent and received SNMP packets."  What
am I doing wrong?

Alternatively, is there a Net-SNMP tool that will tell me what the next
OID after Q-BRIDGE-MIB::dot1qTpFdbStatus.0.'...Â..'.15 is?

Thanks.

                                                Chris










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