[Bro] Dropped Packets

Will Havlovick will.havlovick at zenimax.com
Thu Jan 12 11:00:22 PST 2012

Hi all,

I recently upgraded 3 standalone Bro nodes.  2 of them are Ubuntu and one of them is CentOS 6.2.

On the 2 Ubuntu 11.10 boxes I have a lot of dropped packets in the notice.log
PacketFilter::Dropped_Packets   476 packets dropped after filtering, 52258 received, 52258 on link      
PacketFilter::Dropped_Packets   4914 packets dropped after filtering, 52785 received, 52785 on link     
PacketFilter::Dropped_Packets   3061 packets dropped after filtering, 35701 received, 35702 on link     
PacketFilter::Dropped_Packets   3371 packets dropped after filtering, 30573 received, 30591 on link     
broctl netstats
       bro: 1326394056.309957 recvd=958721774 dropped=67351350 link=1026073125

I then tried to add this line to the broctl.cfg from http://comments.gmane.org/gmane.comp.security.detection.bro/4146
broargs = -l 9800

Which does not appear to be part of the final release and did not work.

The CentOS box is dropping packets, but not the amounts that the 2 Ubuntu boxes are.  

Is there a way to reduce the amount of dropped packets?

Also, I can provide more data if necessary.

Thank you in advance,


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