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TCP Optimization Script

This script applies various TCP optimizations by updating the /etc/sysctl.conf file and then applying the changes. These optimizations are intended to improve network performance and reliability.

Purpose

The purpose of this script is to easily configure TCP settings on a Linux system to optimize network performance. This includes adjustments to TCP windows, retries, timeouts, and enabling BBR congestion control.

What It Does

  1. Backs up the current /etc/sysctl.conf file.
  2. Adds a set of TCP optimization parameters to /etc/sysctl.conf.
  3. Applies the changes using sysctl -p.

Usage

  1. Clone the repository or download the script.
  2. Make the script executable: 
    chmod +x optimize_tcp.sh
  3. Run the script with sudo: 
    sudo ./optimize_tcp.sh

TCP Parameters Applied

  • net.ipv4.tcp_slow_start_after_idle = 0
  • net.ipv4.tcp_no_metrics_save = 0
  • net.ipv4.tcp_abort_on_overflow = 0
  • net.ipv4.tcp_window_scaling = 1
  • net.ipv4.tcp_tw_reuse = 1
  • net.ipv4.tcp_rfc1337 = 1
  • net.ipv4.tcp_sack = 1
  • net.ipv4.tcp_fack = 1
  • net.ipv4.tcp_workaround_signed_windows = 1
  • net.ipv4.tcp_syncookies = 1
  • net.ipv4.tcp_syn_retries = 4
  • net.ipv4.tcp_synack_retries = 2
  • net.ipv4.tcp_orphan_retries = 2
  • net.ipv4.tcp_retries2 = 12
  • net.ipv4.tcp_max_tw_buckets = 262144
  • net.ipv4.tcp_max_syn_backlog = 8192
  • net.ipv4.tcp_mtu_probing = 1
  • net.ipv4.tcp_fin_timeout = 30
  • net.ipv4.tcp_keepalive_time = 7200
  • net.ipv4.tcp_keepalive_intvl = 75
  • net.ipv4.tcp_keepalive_probes = 9
  • net.ipv4.tcp_max_orphans = 262144
  • net.ipv4.tcp_timestamps = 0
  • net.ipv4.ip_no_pmtu_disc = 0
  • net.ipv4.tcp_rmem = 8192 2097152 16777216
  • net.ipv4.tcp_wmem = 4096 16384 33554432
  • net.ipv4.tcp_adv_win_scale = -2
  • net.ipv4.tcp_notsent_lowat = 4294967295
  • net.core.default_qdisc = fq
  • net.ipv4.tcp_congestion_control = bbr
  • user.max_inotify_watches = 2097152

Notes

  • Ensure you have a backup of your current /etc/sysctl.conf before running the script.
  • These settings are designed for general network performance improvement and may not be suitable for all environments. Adjustments might be necessary based on specific needs.

License

This project is licensed under the MIT License.