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


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