Snmptrapd: pre-parse fail

Hi
I'm trying to use the snmptrapd in a pc with two ethernet interfaces
and I cannot see the traps sended by other pc. I'm sure that the traps
arrive because I can see the raw message with the option
snmptrapd -f -Le -d

I also have turn on the debug and I see this line:
trace: _sess_process_packet(): snmp_api.c, 4916:
sess_process_packet: pre-parse fail
trace: _sess_read(): snmp_api.c, 5210:
sess_read: not reading 5 (fdset 0xbffff9b0 set 0)
trace: _sess_read(): snmp_api.c, 5210:
sess_read: not reading 3 (fdset 0xbffff9b0 set 0)
trace: snmp_sess_select_info(): snmp_api.c, 5622:
sess_select: for all sessions: 7 5 3
trace: snmp_sess_select_info(): snmp_api.c, 5622:
sess_select: for all sessions: 7 5 3


What means pre-parse fail? It seems that it receive the packet but it
cannot parse it.
I have tried the same command in other pc with the same netsnmp
version and it works!! Why it does not work in a pc with two ethernet
cards?
--
Salu2:
***************************************
Jos=E9 Mar=EDa Gonz=E1lez
***************************************


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