diff --git a/go.sum b/go.sum
index 49e4c44..e9d153e 100644
--- a/go.sum
+++ b/go.sum
@@ -22,6 +22,5 @@ golang.org/x/sys v0.0.0-20220908164124-27713097b956 h1:XeJjHH1KiLpKGb6lvMiksZ9l0
 golang.org/x/sys v0.0.0-20220908164124-27713097b956/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0 h1:/5xXl8Y5W96D+TtHSlonuFqGHIWVuyCkGJLwGh9JJFs=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
-gvisor.dev/gvisor v0.0.0-20220819163037-ba6e795b139a h1:W1h3JsEzYWg7eD4908iHv49p7AOx7JPKsoh/fsxgylM=
-gvisor.dev/gvisor v0.0.0-20220819163037-ba6e795b139a/go.mod h1:TIvkJD0sxe8pIob3p6T8IzxXunlp6yfgktvTNp+DGNM=
+gvisor.dev/gvisor v0.0.0-20220901235040-6ca97ef2ce1c h1:m5lcgWnL3OElQNVyp3qcncItJ2c0sQlSGjYK2+nJTA4=
 gvisor.dev/gvisor v0.0.0-20220901235040-6ca97ef2ce1c/go.mod h1:TIvkJD0sxe8pIob3p6T8IzxXunlp6yfgktvTNp+DGNM=
diff --git a/system.go b/system.go
index 4ffda39..b6a0bc5 100644
--- a/system.go
+++ b/system.go
@@ -51,6 +51,7 @@ func NewSystem(options StackOptions) (Stack, error) {
 		mtu:           options.MTU,
 		udpTimeout:    options.UDPTimeout,
 		handler:       options.Handler,
+		logger:        options.Logger,
 		inet4Prefixes: options.Inet4Address,
 		inet6Prefixes: options.Inet6Address,
 	}
@@ -149,11 +150,16 @@ func (s *System) wintunLoop(winTun WinTun) {
 			release()
 			continue
 		}
-		switch packet[0] >> 4 {
+		switch ipVersion := packet[0] >> 4; ipVersion {
 		case 4:
-			s.processIPv4(packet)
+			err = s.processIPv4(packet)
 		case 6:
-			s.processIPv6(packet)
+			err = s.processIPv6(packet)
+		default:
+			err = E.New("ip: unknown version: ", ipVersion)
+		}
+		if err != nil {
+			s.logger.Trace(err)
 		}
 		release()
 	}