bye-tcp-internet

Industrial-grade TCP/IP baseline profile for modern Windows 10/11 networking stacks.

No legacy tweaks. No placebo. No deprecated parameters.

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Philosophy: Minimal • Measurable • Reversible

• Minimal — only keys read by tcpip.sys on current builds. No XP/Vista/7-era garbage.
• Measurable — every change is verifiable via netsh and Get-NetTCPSetting. Effect is technical, not subjective.
• Reversible — rollback.reg deletes all overrides, restoring Windows hardcoded defaults. No files are modified.

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Profiles

Choose one profile depending on your use case.

universal.reg — Baseline

Universal profile for workstations and servers. Removes artificial system limits.

Key	Value	Effect
DefaultTTL	64	Standard modern TTL (matches Linux/BSD defaults)
EnablePMTUDiscovery	1	Avoids IP fragmentation on modern links
EnablePMTUBHDetect	0	Disables slow black hole detection
SackOpts	1	Selective ACK — efficient loss recovery
Tcp1323Opts	1	Window Scaling only ¹
MaxUserPort	65534	Expanded ephemeral port range
TcpTimedWaitDelay	30	TIME_WAIT reduced: 240s → 30s
EnableECNCapability	0	ECN disabled — ISP compatibility ²
NetworkThrottlingIndex	0xFFFFFFFF	Removes multimedia packet throttle
SystemResponsiveness	20	20% reserved for background tasks
NonBestEffortLimit	0	Removes QoS bandwidth reservation
NegativeCacheTime	60s	Balanced DNS negative cache
NetFailureCacheTime	30s	Retry failed DNS lookups sooner

¹ Tcp1323Opts explained: Value 1 enables Window Scaling only. Value 3 also enables TCP Timestamps, adding 12 bytes overhead per segment. For most modern networks, Window Scaling alone is sufficient. On high-BDP links (satellite, intercontinental) consider value 3.

² ECN note: Theoretically beneficial but widely mishandled by ISP equipment and home routers, causing connection failures or latency spikes. Disabled for compatibility.

gmvelocity.reg — Low-Latency Gaming

Full superset of universal.reg. All baseline keys plus gaming-specific additions:

Key	Value	Effect
SystemResponsiveness	0	All CPU time available to foreground
Tasks\Games GPU Priority	8	Higher GPU scheduling priority
Tasks\Games Priority	6	Higher MMCSS task priority
Tasks\Games Scheduling Category	High	Kernel scheduler category
Tasks\Games SFIO Priority	High	Storage I/O priority for game tasks
NegativeCacheTime	0	Zero DNS negative cache (instant retry)
NetFailureCacheTime	0	Zero DNS failure cache
MaxNegativeCacheTtl	0	Override TTL for negative DNS responses

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What is NOT changed

Intentionally left untouched to preserve stack stability:

• Autotuning — not disabled. Dynamic window management in Windows 11 is effective by default.
• Congestion Control — CUBIC remains the default provider.
• TCPNoDelay — not set globally. Belongs at the application level.
• Legacy Keys — no TcpWindowSize or other Vista-era parameters.

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Before / After

After applying and rebooting, run netsh int tcp show global. Key lines to check:

ECN Capability                      : disabled       ✓ set by profile
RFC 1323 Timestamps                 : disabled       ✓ Tcp1323Opts=1 (WS only, TS off)
Receive Window Auto-Tuning Level    : normal         — NOT touched (AutoTuning preserved)
Add-On Congestion Control Provider  : cubic          — NOT touched

PowerShell:

Get-NetTCPSetting -SettingName Internet

Or use the included verify.ps1 for a full automated check with PASS/FAIL output.

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Usage

1. Apply

Option A — manual:

1. Double-click the chosen .reg file → Run as Administrator
2. Reboot

Option B — interactive:

apply.bat   (run as Administrator)

2. Verify

# Quick check
netsh int tcp show global

# Full automated verification
powershell -ExecutionPolicy Bypass -File verify.ps1

3. Rollback

Run the corresponding rollback.reg and reboot.

Applied	Rollback
universal.reg	universal-rollback.reg
gmvelocity.reg	gmvelocity-rollback.reg

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Compatibility

OS	Status
Windows 10 22H2+	✅ Supported
Windows 11 (all builds)	✅ Supported
Windows Server 2022/2025	✅ Supported
Windows 10 < 22H2	⚠️ Not tested
Windows 7 / 8 / 8.1	❌ Not supported

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Files

bye-tcp-internet/
├── universal.reg              # Baseline profile
├── universal-rollback.reg     # Rollback for universal
├── gmvelocity.reg             # Low-latency gaming profile
├── gmvelocity-rollback.reg    # Rollback for gmvelocity
├── apply.bat                  # Interactive installer
├── verify.ps1                 # Post-apply verification
├── CHANGELOG.md               # Version history
└── LICENSE

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Methodology & Safety

• Changes remove only client-side limits. Physical latency (RTT) is not affected by registry tweaks.
• Registry Overrides only — no binary patching, no driver replacement.
• Based on tcpip.sys behavior analysis (2025–2026 builds).

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RU — Русская документация

Что это

bye-tcp-internet — верифицированный набор настроек реестра для сетевого стека tcpip.sys. Цель — убрать искусственные ограничения Windows без устаревших и «плацебо» методов.

Профили

universal.reg — универсальный baseline для рабочих станций и серверов. Расширяет диапазон портов, ускоряет освобождение TIME_WAIT, активирует PMTU и SACK, отключает сетевой дроссель и резервирование QoS.

gmvelocity.reg — игровой профиль с низкой задержкой. Включает всё из universal плюс: повышение приоритета MMCSS для игр, агрессивный DNS (нулевой кэш отказов), нулевой SystemResponsiveness.

Установка

1. Запустить нужный .reg от имени администратора
   (или apply.bat для интерактивного меню)
2. Перезагрузить систему

Проверка

# Быстрая
netsh int tcp show global

# Полная автоматическая
powershell -ExecutionPolicy Bypass -File verify.ps1

Откат

Запустить соответствующий rollback.reg → перезагрузить ПК. Все ключи удаляются, стек возвращается к заводским значениям.

Заметки по ключам

Tcp1323Opts=1 — включает только Window Scaling. Значение 3 дополнительно активирует TCP Timestamps (+12 байт на сегмент). Для большинства сетей достаточно 1. На высоко-BDP каналах (спутник, межконтинентальные линки) можно поставить 3.

EnableECNCapability=0 — ECN отключён из-за плохой поддержки на оборудовании ISP и домашних роутерах. Включение может вызвать обрывы соединений.

Что НЕ меняется

• AutoTuning — не отключается
• Congestion Control (CUBIC) — не меняется
• TCPNoDelay — не навязывается глобально
• Легаси-ключи эпохи XP/Vista — отсутствуют

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Author

ceo714 — GitHub

License

MIT