Re: Only TCP packets towards the Snort host trigger alerts

[James Lay <jlay () slave-tothe-box net>]

On 2012-11-13 08:37, Rennhard Marc (rema) wrote:
> This solved it, thanks.
>
> It worked without this option with Snort 2.8.5 / Ubuntu 11.04 - it
> appears Ubuntu has recently enabled checksum offloading.
>
> Cheers,
> Marc


I added the below to my startup scripts for Ubuntu:


ethtool -K eth0 rx off
ethtool -K eth0 tx off
ethtool -K eth0 sg off
ethtool -K eth0 tso off
ethtool -K eth0 gso off
ethtool -K eth0 gro off

This has helped tremendously.

James

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