diff --git a/lower/tun_windows.go b/lower/tun_windows.go
index 919d4c1..335f129 100644
--- a/lower/tun_windows.go
+++ b/lower/tun_windows.go
@@ -3,17 +3,24 @@
 
 package lower
 
-import "net"
+import (
+	"net"
+	"strconv"
+)
 
 func (n *NICIO) Up() {
 	execute("cmd", "/c", "netsh interface ip set address name=\""+n.ifce.Name()+"\" source=static addr=\""+n.ip.String()+"\" mask=\""+(net.IP)(n.subnet.Mask).String()+"\" gateway=none")
 	execute("cmd", "/c", "netsh interface ipv4 set subinterface \""+n.ifce.Name()+"\" mtu="+n.mtu)
+	iface, err := net.InterfaceByName(n.ifce.Name())
+	if err != nil {
+		panic(err)
+	}
 	for _, c := range n.cidrs {
 		ip, cidr, err := net.ParseCIDR(c)
 		if err != nil {
 			panic(err)
 		}
-		execute("cmd", "/c", "route ADD "+ip.String()+" MASK "+(net.IP)(cidr.Mask).String()+" "+n.ip.String())
+		execute("cmd", "/c", "route ADD "+ip.String()+" MASK "+(net.IP)(cidr.Mask).String()+" "+n.ip.String()+" IF "+strconv.Itoa(iface.Index))
 	}
 }