???????/etc/sysctl.conf?????????Linux???????????á?
# ????????
net.ipv4.icmp_echo_ignore_broadcasts = 1
# ???????icmp???????????
net.ipv4.icmp_ignore_bogus_error_responses = 1
# ????SYN???????????
net.ipv4.tcp_syncookies = 1
# ??????????????·?????????
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
# ???????·????
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
# ???????·??????
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
# ????????????·???
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.default.secure_redirects = 0
# ????·????
net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
# ????execshild
kernel.exec-shield = 1
kernel.randomize_va_space = 1
# IPv6????
net.ipv6.conf.default.router_solicitations = 0
net.ipv6.conf.default.accept_ra_rtr_pref = 0
net.ipv6.conf.default.accept_ra_pinfo = 0
net.ipv6.conf.default.accept_ra_defrtr = 0
net.ipv6.conf.default.autoconf = 0
net.ipv6.conf.default.dad_transmits = 0
net.ipv6.conf.default.max_addresses = 1
# ???LB??????
# ???????????????????
fs.file-max = 65535
# ????????PIDs (??????????????); may break some programs 32768
kernel.pid_max = 65536
# ??????IP???????
net.ipv4.ip_local_port_range = 2000 65000
# ????TCP????????С
net.ipv4.tcp_rmem = 4096 87380 8388608
net.ipv4.tcp_wmem = 4096 87380 8388608
# ????Linux???????TCP??????????
# С?????????????????
# ?????????4MB?????????÷?????BDP·??????????????
# Tcp?????
net.core.rmem_max = 8388608
net.core.wmem_max = 8388608
net.core.netdev_max_backlog = 5000
net.ipv4.tcp_window_scaling = 1