Re: Third party walk gives error with snmpd(net-snmp) daemon

2009/8/6 Manish Gupta <[email protected]>:
> Dave,
>
> Now I ran the single part of the command and following are the various
> outputs, I am trying to describe the issue as much as possible.
>
> 1. pkt dump of snmp daemon (snmpd -f -Le -d with other option) ,
> this is the last output

  [snip]

I've decoded that packet, and it looks OK to me.
(It's walking part of the ipAddrTable)



> 2. Following is decode of communication of client and server from wireshark
> (wireshark shows the error for the response packet as )
>
> [Dissector bug, protocol SNMP: proto.c:1153: failed assertion "length == 4"]
> Expert Info (Error/Malformed): proto.c:1153: failed assertion "length == 4"
> Message: proto.c:1153: failed assertion "length == 4"
> Severity level: Error
> Group: Malformed

There's not really enough detail there to be useful.
All that occurs to me is that wireshark is expecting the
request ID to be 4 octets in length - it's actually 2.
(i.e. your client is sending a 16-bit ID)



> 3. Debug output of the snmpwalk command which we ran.(sm_snmpwalk -c public
> --fmt=walk -d -t 2000 10.60.3.115)

That's not really much help either, since it only show the successful
conversation
(up to the atTable).


Can you try running a GETNEXT request (*not* a walk) on the OID
    .1.3.6.1.2.1.20.1.1.10.60.3.1
Does that trigger an error or not?

If not, then try running a GETNEXT on the OID that this returns.
Keep going until you either get to .1.3.6.1.2.1.4.21.1.1.10.127.0.0.1
or the request fails.


Other things to try:
   walking the ipAddrTable
   walking the ip group
   using SNMPv1 rather than SNMPv2c


Dave

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