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Update sysctl optimize schemes for proxy server or web server.

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Molly Lau 2025-12-25 22:37:54 +08:00 • committed by GitHub
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1 changed files with 16 additions and 5 deletions
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@ -242,10 +242,14 @@ net.ipv4.tcp_mtu_probing = 1
# avoid slow-start penalty after idle (often helps proxy patterns)
net.ipv4.tcp_slow_start_after_idle = 0
# SYN cookies protect against SYN flood. Debian usually defaults to 1; keep it enabled.
net.ipv4.tcp_syncookies = 1
# --- Stability for long-lived TCP through NAT/CGNAT/WAN ---
# (reduce "half-dead" connections; helps ChatGPT/YouTube/Reddit clients + proxy tunnels)
net.ipv4.tcp_keepalive_time = 120
net.ipv4.tcp_keepalive_intvl = 20
# Keepalive helps detect half-dead connections through NAT/WAN.
# Too aggressive values may increase overhead and cause false disconnects under packet loss.
net.ipv4.tcp_keepalive_time = 180
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_keepalive_probes = 5
# many outbound connections (proxy relay)
@ -263,8 +267,7 @@ net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
</code></pre>
A typical sysctl optimize template for web server(including BBR optimization of above).
<pre><code>
# --- Core: BBR + fq ---
<pre><code># --- Core: BBR + fq ---
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr
@ -278,6 +281,14 @@ net.ipv4.tcp_mtu_probing = 1
# Avoid slow-start penalty after an idle period; often helps keep throughput stable for intermittent flows.
net.ipv4.tcp_slow_start_after_idle = 0
# SYN cookies protect against SYN flood. Debian usually defaults to 1; keep it enabled.
net.ipv4.tcp_syncookies = 1
# burst handling (web/proxy both benefit)
net.core.somaxconn = 8192
net.ipv4.tcp_max_syn_backlog = 8192
net.core.netdev_max_backlog = 16384
# -----------------------------
# 3) Moderate TCP socket buffers (32MB)
# -----------------------------