||'''Sysctl variable''' ||'''Default 2.6''' ||'''Suggested'''||
||net.ipv4.conf.all.arp_filter ||0 ||1||
||net.ipv4.conf.all.rp_filter ||0 ||1||
||net.ipv4.tcp_max_syn_backlog ||1024 ||4096||
||net.ipv4.ipfrag_low_thresh ||196608 ||262144||
||net.ipv4.ipfrag_high_thresh ||262144 ||393216||
||net.core.netdev_max_backlog ||300 ||2000||
||net.core.rmem_default ||135168 ||262144||
||net.core.rmem_max ||131071 ||8388608||
||net.core.wmem_default ||135168 ||262144||
||net.core.wmem_max ||131071 ||8388608||
||net.ipv4.ip_local_port_range ||32768 61000 ||1024 65535||
||net.ipv4.ip_no_pmtu_disc ||0 ||0||
||net.ipv4.tcp_rmem ||4096 87380 174760 ||8192 262144 4194304||
||net.ipv4.tcp_sack ||1 ||0||
||net.ipv4.tcp_syncookies ||1 ||0||
||net.ipv4.tcp_timestamps ||1 ||0||
||net.ipv4.tcp_window_scaling ||1 ||1||
||net.ipv4.tcp_wmem ||4096 16384 131072 ||8192 262144 4194304||

----
 * you can use below sysctl command or download our script
{{{
$ sysctl -w net.ipv4.conf.all.arp_filter=1
$ sysctl -w net.ipv4.conf.all.rp_filter=1
$ sysctl -w net.ipv4.tcp_max_syn_backlog=4096
$ sysctl -w net.ipv4.ipfrag_low_thresh=262144
$ sysctl -w net.ipv4.ipfrag_high_thresh=393216
$ sysctl -w net.core.netdev_max_backlog=2000
$ sysctl -w net.core.rmem_default=262144
$ sysctl -w net.core.rmem_max=8388608
$ sysctl -w net.core.wmem_default=262144
$ sysctl -w net.core.wmem_max=8388608
$ sysctl -w net.ipv4.ip_local_port_range="1024 65535"
$ sysctl -w net.ipv4.ip_no_pmtu_disc=0
$ sysctl -w net.ipv4.tcp_rmem="8192 262144 4194304"
$ sysctl -w net.ipv4.tcp_sack=0
$ sysctl -w net.ipv4.tcp_syncookies=0
$ sysctl -w net.ipv4.tcp_timestamps=0
$ sysctl -w net.ipv4.tcp_window_scaling=1
$ sysctl -w net.ipv4.tcp_wmem="8192 262144 4194304"
}}}