Index: contrib/tcpdump/ip6.h
===================================================================
--- contrib/tcpdump/ip6.h
+++ contrib/tcpdump/ip6.h
@@ -98,11 +98,6 @@
 /* in network endian */
 #define IPV6_FLOWINFO_MASK	((uint32_t)htonl(0x0fffffff))	/* flow info (28 bits) */
 #define IPV6_FLOWLABEL_MASK	((uint32_t)htonl(0x000fffff))	/* flow label (20 bits) */
-#if 1
-/* ECN bits proposed by Sally Floyd */
-#define IP6TOS_CE		0x01	/* congestion experienced */
-#define IP6TOS_ECT		0x02	/* ECN-capable transport */
-#endif
 
 /*
  * Extension Headers
Index: sys/netinet/ip6.h
===================================================================
--- sys/netinet/ip6.h
+++ sys/netinet/ip6.h
@@ -105,11 +105,6 @@
 #endif /* LITTLE_ENDIAN */
 #endif
 #define IPV6_FLOWLABEL_LEN	20
-#if 1
-/* ECN bits proposed by Sally Floyd */
-#define IP6TOS_CE		0x01	/* congestion experienced */
-#define IP6TOS_ECT		0x02	/* ECN-capable transport */
-#endif
 
 /*
  * Extension Headers