--- sys/dev/e1000/if_igb.h.orig	2014-10-12 13:20:23.000000000 +0600
+++ sys/dev/e1000/if_igb.h	2015-10-01 21:16:03.119032826 +0500
@@ -237,9 +237,9 @@
 
 /* Offload bits in mbuf flag */
 #if __FreeBSD_version >= 800000
-#define CSUM_OFFLOAD		(CSUM_IP|CSUM_TCP|CSUM_UDP|CSUM_SCTP)
+#define CSUM_OFFLOAD		(CSUM_TCP|CSUM_UDP|CSUM_SCTP)
 #else
-#define CSUM_OFFLOAD		(CSUM_IP|CSUM_TCP|CSUM_UDP)
+#define CSUM_OFFLOAD		(CSUM_TCP|CSUM_UDP)
 #endif
 
 /* Define the starting Interrupt rate per Queue */