From 445c0d456c39377f0dee08cd296d6f70c81d3fbd Mon Sep 17 00:00:00 2001
From: ki <59279014+KiGamji@users.noreply.github.com>
Date: Sat, 24 Jan 2026 17:39:07 +0500
Subject: [PATCH] TUN inbound: Disable RACK/TLP recovery to fix connection
 stalls (#5600)

https://github.com/XTLS/Xray-core/issues/5599#issuecomment-3794495254

Fixes https://github.com/XTLS/Xray-core/issues/5599
---
 proxy/tun/stack_gvisor.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/proxy/tun/stack_gvisor.go b/proxy/tun/stack_gvisor.go
index 952150a8..ab767c61 100644
--- a/proxy/tun/stack_gvisor.go
+++ b/proxy/tun/stack_gvisor.go
@@ -236,6 +236,10 @@ func createStack(ep stack.LinkEndpoint) (*stack.Stack, error) {
 	mOpt := tcpip.TCPModerateReceiveBufferOption(true)
 	gStack.SetTransportProtocolOption(tcp.ProtocolNumber, &mOpt)
 
+	// Disable RACK/TLP loss recovery to fix connection stalls under high load
+	rOpt := tcpip.TCPRecovery(0)
+	gStack.SetTransportProtocolOption(tcp.ProtocolNumber, &rOpt)
+
 	tcpRXBufOpt := tcpip.TCPReceiveBufferSizeRangeOption{
 		Min:     tcpRXBufMinSize,
 		Default: tcpRXBufDefSize,