net.ipv4.tcp_fin_timeout=30
net.ipv4.tcp_keepalive_time=120
net.ipv4.tcp_syncookies=1
-net.ipv4.tcp_timestamps=0
+net.ipv4.tcp_timestamps=1
+net.ipv4.tcp_sack=1
+net.ipv4.tcp_dsack=1
net.ipv4.netfilter.ip_conntrack_checksum=0
net.ipv4.netfilter.ip_conntrack_max=16384