--- zzzz-none-000/linux-3.10.107/net/ipv6/sit.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/net/ipv6/sit.c	2021-11-10 11:53:56.000000000 +0000
@@ -17,6 +17,12 @@
  * Fred Templin <fred.l.templin@boeing.com>:	isatap support
  */
 
+/**
+ * Some part of this file is modified by Ikanos Communications. 
+ *
+ * Copyright (C) 2013-2014 Ikanos Communications.
+ */  
+
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/module.h>
@@ -740,7 +746,15 @@
 	struct ip_tunnel *tunnel = netdev_priv(dev);
 	const struct iphdr  *tiph = &tunnel->parms.iph;
 	const struct ipv6hdr *iph6 = ipv6_hdr(skb);
+	// Instead of using the user supplied TOS value copy it from the inner IP header
+	// This has been done because the TOS value carried in the inner and outer IP
+	// header should be same.
+#if defined(CONFIG_FUSIV_VX185) || defined(CONFIG_FUSIV_VX585)
+	u8	tos = ipv6_get_dsfield(iph6);
+#else
 	u8     tos = tunnel->parms.iph.tos;
+#endif
+
 	__be16 df = tiph->frag_off;
 	struct rtable *rt;     			/* Route to the other host */
 	struct net_device *tdev;		/* Device to other host */