[CentOS] lost udp packets

James Pifer jep at obrien-pifer.com
Thu Oct 4 14:23:16 EDT 2012


On 10/4/2012 1:56 PM, m.roth at 5-cent.us wrote:
> James Pifer wrote:
>>> I'd try strace'ing the app that is supposed to be receiving them to
>>> see if the socket opens are working and what happens with a packet
>>> arrives on the port.
>>>
>>
>> No idea what this means. snmptrapd keeps running (strace snmptrapd -f
>> -Le -c /etc/snmp/snmptrapd.conf), but I see this over and over after the
>> initial start:
>>
>> gettimeofday({1349372532, 120897}, NULL) = 0
>> gettimeofday({1349372532, 120917}, NULL) = 0
>> gettimeofday({1349372532, 120934}, NULL) = 0
>> gettimeofday({1349372532, 120950}, NULL) = 0
>> select(9, [3 5 7 8], [], [], {5, 0})    = 0 (Timeout)
> <snip>
> Do you have ntp running on all the servers?
>
>        mark
>
> _________

Not necessarily. SNMP traps are coming from all different kinds of 
devices. I can't imagine wrong times would mess up snmptrpd. Are you 
thinking that's what it's having a problem with?

Even if I try to just to a udp forward, with socat, iptables, or a 
couple specific forwarding apps I tried, nothing seems to get to the apps.

I might just try restarting this server during the night. Maybe 
something is just hosed.

Any other ideas?

Thanks,
James


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