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How to disable tcp timestamp

as root

# echo 0 > /proc/sys/net/ipv4/tcp_timestamps

For permanent setting edit /etc/sysctl.conf & add

net.ipv4.tcp_timestamps = 0

Additionally, add iptable rule

# iptables -A INPUT -p icmp-type timestamp-request -j DROP

# iptables -A OUTPUT -p icmp-type timestamp-reply -j DROP