On Mon, 21 Nov 2011 23:16:01 GMT
guangsu <guangsu@no-mx.forums.novell.com> wrote:

>
> Hi,
>
> I am trying to block the tcp timestamp request by adding
> net.ipv4.tcp_timestamps = 0 to /etc/sysctl.conf and reboot. However,
> it does not seem to work. The system still accepting tcp timestamp
> request and replying to it.
>
> sysctl -a | grep timestamp
> net.ipv4.tcp_timestamps = 0
>
> cat /proc/sys/net/ipv4/tcp_timestamps
> 0
>
> using this tool to do tcp timestamp request ( hping3 --tcp-timestamp
> HOST_IP )
>
> Thanks
>
> --Guang
>
>

Hi
You probably need to add some iptables rules;
http://blog.theroux.ca/security/disa...amps-on-linux/

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