Re: snmptrapd does not resolve hostnames / debug token

On 03/30/12 22:41, Stuart Kendrick wrote:

> I load snmptrapd as follows:
> 
> /usr/local/sbin/snmptrapd -Lsd -p /var/run/snmptrapd.pid
> 
> And it resolves hostnames in the traps it logs in the following fashion
> ('tuk-cold-emu' is the hostname):
> 
> Mar  1 00:24:29 loghost snmptrapd[28435]: 2012-03-01 00:24:29
> tuk-cold-emu [10.18.208.15] (via UDP:
> [10.18.208.15]:45911->[10.18.42.13]:162) TRAP, SNMP v1, community secret
> PowerNet-MIB::apc Enterprise Specific Trap
> (PowerNet-MIB::apcEnvLowTempThresholdViolation) Uptime: 13 days,
> 14:09:51.95        ...
> 
> yum installs patches regularly ... but I haven't rebooted in a year or
> more ... I rebooted a few days ago ... and snmptrapd no longer resolves
> hostnames:
> 
> Mar 30 00:20:51 loghost snmptrapd[21184]: 2012-03-30 00:20:51
> 10.18.208.15(via UDP: [10.18.208.15]:40058->[10.18.42.13]:162) TRAP,
> SNMP v1, community secret      PowerNet-MIB::apc Enterprise Specific
> Trap (PowerNet-MIB::apcEnvLowTempThresholdViolation) Uptime: 42 days,
> 13:05:59.55  [....]
> 
> i.e. snmptrapd is behaving as though I had loaded it with the '-n'
> flag.  But I haven't:
> 
> loghost> ps -ef | grep snmptrapd
> root     15603     1  0 14:59 ?        00:00:16
> /usr/local/sbin/snmptrapd -Lsd -p /var/run/snmptrapd.pid
> loghost>
> 
> The usual utilities resolve names fine:
> loghost> host 10.18.208.15
> 15.208.18.10.in-addr.arpa domain name pointer TUK-COLD-EMU.COMPANY.COM
> loghost>
> 
> net-snmp-5.7.1
> CentOS 5.8
> 
> I'm looking for a debug token which might help shed light on this:
> http://www.net-snmp.org/wiki/index.php/Debug_tokens_5.4.2.1
> 
> But I don't see anything obvious (when searching for 'name' or 'host' or
> 'addr').
> 
> Any suggestions on a debug token to try?  Other suggestions for
> trouble-shooting?


You could try to clone the Net-SNMP git repository and to build and
install the V5-7-patches branch. From the changelog:

commit 2cc9504b9bb8625b94be6cda7e60993d059cd928
Date:   Wed Oct 26 09:01:23 2011 +0200

    CHANGES: snmplib: BUG: 3428506: Fix netsnmp_gethostbyaddr()

    This patch should fix the regressions introduced by commit 85d96c4
(May 13, 2011).

Bart.

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