typedef struct ip_header {
  UCHAR   iph_verlen;
  UCHAR   iph_tos;  
  USHORT  iph_length;  
  USHORT  iph_id;       
  USHORT  iph_offset; 
  UCHAR   iph_ttl;     
  UCHAR   iph_protocol; 
  USHORT  iph_xsum;    
  ULONG   iph_src;      
  ULONG   iph_dest;   
} IPHeader;

	ip_hd->iph_verlen = 0x45;
	ip_hd->iph_tos	= 0x01;
	ip_hd->iph_length = htons(40);
	ip_hd->iph_id	= htons(0x0800);
	ip_hd->iph_offset = 0x0;
	ip_hd->iph_ttl	=	0xff;
	ip_hd->iph_protocol		=	0x06;
	ip_hd->iph_xsum	=	0x00;
	ip_hd->iph_dest	=	inet_addr("192.168.0.1");