diff --git a/linux-2.6.29.4-gre-fix-tos-inheritance.patch b/linux-2.6.29.4-gre-fix-tos-inheritance.patch
new file mode 100644
index 0000000..209bd3f
--- /dev/null
+++ b/linux-2.6.29.4-gre-fix-tos-inheritance.patch
@@ -0,0 +1,21 @@
+Fixes two bugs:
+- ToS/DiffServ inheritance was unintentionally activated when using impair fixed ToS values
+- ECN bit was lost during ToS/DiffServ inheritance
+
+Signed-off-by: Andreas Jaggi <aj@open.ch>
+
+--- vanilla-linux-2.6.29.4/net/ipv4/ip_gre.c	2009-05-19 01:52:34.000000000 +0200
++++ gre-dev-2/net/ipv4/ip_gre.c	2009-07-14 17:14:34.000000000 +0200
+@@ -677,10 +677,10 @@
+ 	}
+ 
+ 	tos = tiph->tos;
+-	if (tos&1) {
++	if (tos == 1) {
++		tos = 0;
+ 		if (skb->protocol == htons(ETH_P_IP))
+ 			tos = old_iph->tos;
+-		tos &= ~1;
+ 	}
+ 
+ 	{