nd_uint16_t ip_len; /* total length */
nd_uint16_t ip_id; /* identification */
nd_uint16_t ip_off; /* fragment offset field */
-#define IP_DF 0x4000 /* dont fragment flag */
+#define IP_DF 0x4000 /* don't fragment flag */
#define IP_MF 0x2000 /* more fragments flag */
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
nd_uint8_t ip_ttl; /* time to live */