[tkined] message too long error

Juergen Schoenwaelder schoenw at ibr.cs.tu-bs.de
Mon Aug 6 10:41:46 CEST 2001

>>>>> Vishi Anand writes:

Vishi> I get the following error when I try to use getBulk with an
Vishi> agent.

Vishi> recvfrom failed: message too long

Vishi> Is this to do with the size of PDU which an agent can send or
Vishi> something to do with Scotty?

The agent sends a message which scotty can't read since the buffer
provided by scotty is too small (16K in 3.0.0, 2K in 2.1.X). You can
change this constant (TNM_SNMP_MAXSIZE) in tnm/snmp/tnmSnmp.h.

Note that SNMPv2c does not allow to "negotiate" the max. message size
between SNMP engines hence an agent which returns big responses is
likely to cause interoperability problems like this. SNMPv3 fixes this


Juergen Schoenwaelder      Technical University Braunschweig
<schoenw at ibr.cs.tu-bs.de>  Dept. Operating Systems & Computer Networks
Phone: +49 531 391 3289    Bueltenweg 74/75, 38106 Braunschweig, Germany
Fax:   +49 531 391 5936    <URL:http://www.ibr.cs.tu-bs.de/~schoenw/>

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