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diff --git a/dummynet2/include/netinet/ip.h b/dummynet2/include/netinet/ip.h
new file mode 100644
index 0000000..bdd8cf0
--- /dev/null
+++ b/dummynet2/include/netinet/ip.h
@@ -0,0 +1,46 @@
+#ifndef _NETINET_IP_H_
+#define _NETINET_IP_H_
+
+#define LITTLE_ENDIAN   1234
+#define BIG_ENDIAN      4321
+#if defined(__BIG_ENDIAN)
+#error we are in bigendian
+#elif defined(__LITTLE_ENDIAN)
+//#warning we are in littleendian
+#define BYTE_ORDER      LITTLE_ENDIAN
+#else
+#error no platform
+#endif
+
+/* XXX endiannes doesn't belong here */
+// #define LITTLE_ENDIAN   1234
+// #define BIG_ENDIAN      4321
+// #define BYTE_ORDER      LITTLE_ENDIAN
+
+/*
+ * Structure of an internet header, naked of options.
+ */
+struct ip {
+#if BYTE_ORDER == LITTLE_ENDIAN
+        u_int   ip_hl:4,                /* header length */
+                ip_v:4;                 /* version */
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+        u_int   ip_v:4,                 /* version */
+                ip_hl:4;                /* header length */
+#endif
+        u_char  ip_tos;                 /* type of service */
+        u_short ip_len;                 /* total length */
+        u_short ip_id;                  /* identification */
+        u_short ip_off;                 /* fragment offset field */
+#define IP_RF 0x8000                    /* reserved fragment flag */
+#define IP_DF 0x4000                    /* dont fragment flag */
+#define IP_MF 0x2000                    /* more fragments flag */
+#define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
+        u_char  ip_ttl;                 /* time to live */
+        u_char  ip_p;                   /* protocol */
+        u_short ip_sum;                 /* checksum */
+        struct  in_addr ip_src,ip_dst;  /* source and dest address */
+} __packed __aligned(4);
+
+#endif /* _NETINET_IP_H_ */