Re: host <UNKNOWN> in snmptrpad

Hi,

I too have the same problem. However, in my case, I changed Net-SNMP 
5.1.2 (from the Centos 4.3 distribution) to 5.4rc2. No other changes 
happened on the system,
so it's unlikely to be a DNS problem. I'm running snmptrapd to perl 
programs like so:

traphandle 
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingSuccessfulAuthentication.0.1 
/iHotel/server/bin/snmp/association
traphandle 
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingSuccessfulAssociation.0.1 
/iHotel/server/bin/snmp/association
traphandle SNMPv2-SMI::enterprises.8744.5.6.2.0.4 
/iHotel/server/bin/snmp/heartbeat

here is an example:

main-west-bowman
24.57.195.185
SNMPv2-MIB::sysUpTime.0 5:10:38:38.23
SNMPv2-MIB::snmpTrapOID.0 
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingSuccessfulAssociation.0.1
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingEventInformation (2006-11-14 
13:58:09) wvlan0 Free Internet 00:15:00:1C:56:5B Wireless Association 
Success

<UNKNOWN>
UDP: [24.57.195.185]:32777
DISMAN-EVENT-MIB::sysUpTimeInstance 5:10:49:43.24
SNMPv2-MIB::snmpTrapOID.0 
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingSuccessfulAuthentication.0.1
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingEventInformation (2006-11-14 
14:09:14) wvlan0 Free Internet 00:13:CE:2E:D0:7A Wireless Authentication 
Success


Here are the exact same entries from snmptrapd.log: (note that the 
reverse lookup is different in the both cases.... what's up here?)

2006-11-14 12:56:57 d57-195-185.home.cgocable.net [24.57.195.185]:
SNMPv2-MIB::sysUpTime.0 = Timeticks: (47031823) 5 days, 10:38:38.23     
SNMPv2-MIB::snmpTrapOID.0 = OID: 
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingSuccessfulAssociation.0.1  
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingEventInformation = STRING: 
(2006-11-14 13:58:09) wvlan0 Free Internet 00:15:00:1C:56:5B Wireless 
Association Success

2006-11-14 13:08:01 d57-195-185.home.cgocable.net [24.57.195.185]:
SNMPv2-MIB::sysUpTime.0 = Timeticks: (47098324) 5 days, 10:49:43.24     
SNMPv2-MIB::snmpTrapOID.0 = OID: 
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingSuccessfulAuthentication.0.1       
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingEventInformation = STRING: 
(2006-11-14 14:09:14) wvlan0 Free Internet 00:13:CE:2E:D0:7A Wireless 
Authentication Success


These two entries are just minutes apart. The only change was switching 
the version of Net-SNMP. Note also that the sysUpTimeInstance is now 
reported from the DISMAN mib, not the SNMPv2 mib. The config files 
(snmp.conf,snmpd.conf, and snmptrapd.conf are unchanged from the 
previous version).

In 5.1.2, if the ip address could not be looked up, it just appeared in 
both places. I have other examples:

10.81.0.37
10.81.0.37
SNMPv2-MIB::sysUpTime.0 0:1:07:26.14
SNMPv2-MIB::snmpTrapOID.0 
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingSuccessfulAssociation.0.1
COLUBRIS-CLIENT-TRACKING-MIB::clientTrackingEventInformation (2006-11-14 
06:22:54) wvlan0 00:14:A5:81:E7:22 Wireless Association Success
The change to <UNKNOWN> and the format change for the source address 
from just an address to the UDP [...]:xxxx form are significant in that 
we have to modify our code now to fit.

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