From d9f0e1fa46bce065ad78a1a87567b12625419450 Mon Sep 17 00:00:00 2001
From: SunBK201 <sunbk201gm@gmail.com>
Date: Thu, 11 Dec 2025 20:19:22 +0800
Subject: [PATCH] fix: skip netlink helper setup when no modification options
 are enabled

---
 src/internal/server/netlink/netlink_linux.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/internal/server/netlink/netlink_linux.go b/src/internal/server/netlink/netlink_linux.go
index 39c72e7..dd04c76 100644
--- a/src/internal/server/netlink/netlink_linux.go
+++ b/src/internal/server/netlink/netlink_linux.go
@@ -41,6 +41,10 @@ func New(cfg *config.Config) *Server {
 }
 
 func (s *Server) Start() (err error) {
+	if !(s.cfg.SetTTL || s.cfg.DelTCPTimestamp || s.cfg.SetTCPInitialWindow || s.cfg.SetIPID) {
+		slog.Info("No packet modification options enabled, skipping netlink helper setup")
+		return nil
+	}
 	err = s.Firewall.Setup(s.cfg)
 	if err != nil {
 		slog.Error("s.Firewall.Setup", slog.Any("error", err))