2 files changed, 3 insertions, 2 deletions
diff --git a/ip.h b/ip.h
index 1544dbf..858cc89 100644
--- a/ip.h
+++ b/ip.h
@@ -36,13 +36,14 @@
 		.tos		= 0,					\
 		.tot_len	= 0,					\
 		.id		= 0,					\
-		.frag_off	= 0,					\
+		.frag_off	= htons(IP_DF), 			\
 		.ttl		= 0xff,					\
 		.protocol	= (proto),				\
 		.saddr		= 0,					\
 		.daddr		= 0,					\
 	}
 #define L2_BUF_IP4_PSUM(proto)	((uint32_t)htons_constant(0x4500) +	\
+				 (uint32_t)htons_constant(IP_DF) +	\
 				 (uint32_t)htons(0xff00 | (proto)))
 
 
diff --git a/tap.c b/tap.c
index d0673e5..44b0fc0 100644
--- a/tap.c
+++ b/tap.c
@@ -153,7 +153,7 @@ static void *tap_push_ip4h(struct iphdr *ip4h, struct in_addr src,
 	ip4h->tos = 0;
 	ip4h->tot_len = htons(l3len);
 	ip4h->id = 0;
-	ip4h->frag_off = 0;
+	ip4h->frag_off = htons(IP_DF);
 	ip4h->ttl = 255;
 	ip4h->protocol = proto;
 	ip4h->saddr = src.s_addr;