net.ipv4.icmp_echo_ignore_broadcasts=1
net.ipv4.icmp_ignore_bogus_error_responses=1
net.ipv4.tcp_ecn=0
-net.ipv4.tcp_max_syn_backlog=2048
-net.ipv4.tcp_mtu_probing=1
-net.ipv4.tcp_retries1=2
+net.ipv4.tcp_max_syn_backlog=4096
net.ipv4.tcp_rfc1337=1
-net.ipv4.tcp_synack_retries=2
net.ipv4.tcp_syncookies=1
vm.min_free_kbytes=10240
vm.mmap_min_addr=65536