insert_u_long
insert_u_long(hp->subnet_mask.s_addr, &vp); /* -4 bytes */
insert_u_long(addrptr->s_addr, dest);
insert_u_long(htonl(hp->time_offset), &vp); /* -4 bytes */
insert_u_long(hp->swap_server.s_addr, &vp); /* -4 bytes */
extern void insert_u_long(u_int32, u_char **);