你可以通过编辑/etc/sysctl.conf来控制和配置Linux内核、网络设置。

# Avoid a smurf attack

net.ipv4.icmp_echo_ignore_broadcasts = 1

# Turn on protection for bad icmp error messages

net.ipv4.icmp_ignore_bogus_error_responses = 1

# Turn on syncookies for SYN flood attack protection

net.ipv4.tcp_syncookies = 1

# Turn on and log spoofed, source routed, and redirect packets

net.ipv4.conf.all.log_martians = 1

net.ipv4.conf.default.log_martians = 1

# No source routed packets here

net.ipv4.conf.all.accept_source_route = 0

net.ipv4.conf.default.accept_source_route = 0

# Turn on reverse path filtering

net.ipv4.conf.all.rp_filter = 1

net.ipv4.conf.default.rp_filter = 1

# Make sure no one can alter the routing tables

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

# Don’t act as a router

net.ipv4.ip_forward = 0

net.ipv4.conf.all.send_redirects = 0

net.ipv4.conf.default.send_redirects = 0

# Turn on execshild

kernel.exec-shield = 1

kernel.randomize_va_space = 1

# Tuen 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

# Optimization for port usefor LBs

# Increase system file descriptor limit

fs.file-max = 65535

# Allow for more PIDs (to reduce rollover problems); may break some programs 32768

kernel.pid_max = 65536

# Increase system IP port limits

net.ipv4.ip_local_port_range = 2000 65000

# Increase TCP max buffer size setable using setsockopt()

net.ipv4.tcp_rmem = 4096 87380 8388608

net.ipv4.tcp_wmem = 4096 87380 8388608

# Increase Linux auto tuning TCP buffer limits

# min, default, and max number of bytes to use

# set max to at least 4MB, or higher if you use very high BDP paths

# Tcp Windows etc

net.core.rmem_max = 8388608

net.core.wmem_max = 8388608

net.core.netdev_max_backlog = 5000

net.ipv4.tcp_window_scaling = 1