[Bro] AF_PACKET on Ubuntu 16.04

Michał Purzyński michalpurzynski1 at gmail.com
Wed Feb 22 15:51:47 PST 2017

Have you disabled hardware hash with ethtool? By default kernel will use the card hash which is asymmetric.

You can verify it with ethtool -k <card>

Look for rxhash - should be disabled.


Should show you how to prepare your system, you can ignore the core isolation and affinity for bro.

> On Feb 22, 2017, at 3:29 PM, Gary Faulkner <gfaulkner.nsm at gmail.com> wrote:
> I'm trying AF_PACKET with Bro, but seem to be running a kernel and 
> driver combo that doesn't appear to properly support symmetric hashing. 
> I'm on Ubuntu 16.04 with kernel 4.4.0-59-generic. From what I can tell 
> the patches should have been added around kernel 4.4.0-39 or so, but 
> Justin's verification tool and Bro both seem to agree that it is broken 
> on my system. I've tried with the OS supplied IXGBE driver (4.2.1-k) as 
> well as compiling from scratch using a recent IXGBE directly from Intel 
> (5.0.4). Is there a known working kernel and driver combo for Ubuntu 
> 16.04, or are the necessary patches still not pushed into 16.04?
> Thanks,
> Gary
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