From 971a8dadfcfc654a38b9c8d6b2050155d71c9ce7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=A3=8E=E6=89=87=E6=BB=91=E7=BF=94=E7=BF=BC?=
 <Fangliding.fshxy@outlook.com>
Date: Thu, 20 Mar 2025 17:44:02 +0000
Subject: [PATCH] Fix network stack

---
 transport/internet/system_dialer.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/transport/internet/system_dialer.go b/transport/internet/system_dialer.go
index 52b1e830..4af666c5 100644
--- a/transport/internet/system_dialer.go
+++ b/transport/internet/system_dialer.go
@@ -73,7 +73,14 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 				return nil, err
 			}
 			sys.Control(func(fd uintptr) {
-				if err := applyOutboundSocketOptions("udp", dest.NetAddr(), fd, sockopt); err != nil {
+				// applyOutboundSocketOptions needs to netwotk with specified network stack(udp4/udp6)
+				var network string
+				if destAddr.IP.To4() != nil {
+					network = "udp4"
+				} else {
+					network = "udp6"
+				}
+				if err := applyOutboundSocketOptions(network, dest.NetAddr(), fd, sockopt); err != nil {
 					errors.LogInfo(ctx, err, "failed to apply socket options")
 				}
 			})