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Just add this lines to your /etc/system file. Better to use it for high load server. set noexec_user_stack=1 set noexec_user_stack_log=1 set semsys:seminfo_semmni=100 set semsys:seminfo_semmns=1024 set semsys:seminfo_semmsl=256 set semsys:seminfo_semvmx=32767 set shmsys:shminfo_shmmax=4294967295 set shmsys:shminfo_shmmin=1 set shmsys:shminfo_shmmni=100 set shmsys:shminfo_shmseg=10

Just adding this script on your /etc/rc3.d, dont' forget to chmod it to 744. /etc/rc3.d/S100nettune #!/bin/sh # # Basic Hardening /usr/sbin/ndd -set /dev/ip ip_forward_src_routed 0 /usr/sbin/ndd -set /dev/ip ip_forwarding 0 /usr/sbin/ndd -set /dev/tcp tcp_conn_req_max_q 16384 /usr/sbin/ndd -set /dev/tcp tcp_conn_req_max_q0 16384 /usr/sbin/ndd -set /dev/tcp tcp_xmit_hiwat 400000 /usr/sbin/ndd -set /dev/tcp tcp_recv_hiwat 400000 /usr/sbin/ndd -set /dev/tcp tcp_cwnd_max 2097152 /usr/sbin/ndd -set /dev/tcp tcp_ip_abort_interval 60000 /usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_initial 4000 /usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_max 10000 /usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_min 3000 /usr/sbin/ndd -set /dev/tcp tcp_max_buf 4194304 /usr/sbin/ndd -set /dev/tcp tcp_maxpsz_multiplier 10 #Oracle Required /usr/sbin/ndd -set /dev/udp udp_recv_hiwat 65535 /usr/sbin/ndd -set /dev/udp udp_xmit_hiwat 65535 # Added parameter /usr/sbin/ndd -set /dev/