可以通過/etc/sysctl.conf控制和配置Linux內核及網絡設置。

# 避免放大***
net.ipv4.icmp_echo_ignore_broadcasts = 1

# 開啟惡意icmp錯誤消息保護
net.ipv4.icmp_ignore_bogus_error_responses = 1

# 開啟SYN洪水***保護
net.ipv4.tcp_syncookies = 1

# 開啟并記錄欺騙，源路由和重定向包
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1

# 處理無源路由的包
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0

# 開啟反向路徑過濾
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1

# 確保無人能修改路由表
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

# 不充當路由器
net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0

# 開啟execshild
kernel.exec-shield = 1
kernel.randomize_va_space = 1

# IPv6設置
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

# 優化LB使用的端口

# 增加系統文件描述符限制
fs.file-max = 65535

# 允許更多的PIDs (減少滾動翻轉問題); may break some programs 32768
kernel.pid_max = 65536

# 增加系統IP端口限制
net.ipv4.ip_local_port_range = 2000 65000

# 增加TCP最大緩沖區大小
net.ipv4.tcp_rmem = 4096 87380 8388608
net.ipv4.tcp_wmem = 4096 87380 8388608

# 增加Linux自動調整TCP緩沖區限制
# 最小，默認和最大可使用的字節數
# 最大值不低于4MB，如果你使用非常高的BDP路徑可以設置得更高

# Tcp窗口等
net.core.rmem_max = 8388608
net.core.wmem_max = 8388608
net.core.netdev_max_backlog = 5000
net.ipv4.tcp_window_scaling = 1

轉載于:https://blog.51cto.com/455178278/1260596

總結

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