diff --git a/includes/help.h b/includes/help.h
index 3984fd5..67d0190 100644
--- a/includes/help.h
+++ b/includes/help.h
@@ -23,9 +23,7 @@ static options_t options[] = {
 	{"size", 's', "send NUMBER data octets", 1, GRP},
 	{"timeout", 'w', "stop after N seconds", 1, GRP},
 	{"ttl", 't', "specify N as time-to-live", 1, GRP},
-	{"ip-timestamp", 'i',
-	 "IP timestamp of type FLAG, which is one of \"tsonly\" and \"tsaddr\"", 1,
-	 GRP}
+	{"interval", 'i', "wait NUMBER seconds between sending each packet", 1, GRP}
 #undef GRP
 };
 
@@ -40,23 +38,39 @@ static options_t options[] = {
 #define OPT_HANDLE(i)                                                          \
 	if (options[i].arg_nb == 1) {                                              \
 		if (!(av + 1) || !*(av + 1)) {                                         \
+			print_parse_err(NEED_ARG, (*av) + 1);                              \
 			return EX_USAGE;                                                   \
 		}                                                                      \
-		args->arg[i] = *(av + 1);                                              \
+		int n = atoi(*(av + 1));                                               \
+		if (n == 0) {                                                          \
+			print_parse_err(ERR_ARG, (*av) + 1);                               \
+			return EX_USAGE;                                                   \
+		}                                                                      \
+		args->arg[i] = n;                                                      \
 	}                                                                          \
 	args->opts[i] = true;                                                      \
 	return EXIT_SUCCESS;
 
-typedef enum { MISSING_HOST, INVALID_OPT, NEED_ARG } error_t;
+typedef enum { MISSING_HOST, INVALID_OPT, NEED_ARG, ERR_ARG } error_t;
 
 /**
- * @brief	Can be used to print the help message if no host (or addr) are
- *			provided
+ * @brief		Can be used to print error message when needed
+ * @param err	The type of error to print
+ * @param opt	The option that cause an error (if applicable)
  */
 void print_parse_err(error_t err, char *opt);
 
+/**
+ *	@brief	Can be used to print the help message
+ */
 void print_help(void);
 
+/**
+ *	@brief	Can be used to print the usage help message
+ */
 void print_usage(void);
 
+/**
+ *	@brief	Can be used to print the version message
+ */
 void print_version(void);
diff --git a/includes/opt_parse.h b/includes/opt_parse.h
index 2b23dfd..d36267e 100644
--- a/includes/opt_parse.h
+++ b/includes/opt_parse.h
@@ -2,17 +2,18 @@
 
 #include <help.h>
 
-#include <stdint.h>
 #include <stdbool.h>
+#include <stdint.h>
 
 typedef struct {
-	bool  opts[OPT_NB];
-	char *arg[OPT_NB];
+	bool   opts[OPT_NB];
+	int	   arg[OPT_NB];
 	char **hosts;
 } args_t;
 
 /**
  *	@brief		Can be used to parse the command line options
  *	@param av	The argv of the program
+ *	@param args	The struct of argument
  */
 int opt_parse(char **av, args_t *args);
diff --git a/includes/ping.h b/includes/ping.h
index cd6f93e..5b3f83a 100644
--- a/includes/ping.h
+++ b/includes/ping.h
@@ -1,3 +1,20 @@
 #pragma once
 
+#include <stdbool.h>
+
 extern char *exec_name;
+
+typedef struct {
+	bool verbose;
+	int	 count;
+	int	 size;
+	int	 timeout;
+	int	 ttl;
+	int	 interval;
+} ping_t;
+
+#define DEFAULT_COUNT -1
+#define DEFAULT_VERBOSE false
+#define DEFAULT_SIZE 0
+#define DEFAULT_INTERVAL 0
+#define DEFAULT_TIMEOUT 0
diff --git a/src/help.c b/src/help.c
index 4793da4..a37623a 100644
--- a/src/help.c
+++ b/src/help.c
@@ -63,8 +63,13 @@ void print_parse_err(error_t err, char *opt) {
 		printf("%s: invalid option -- %s\n", exec_name, opt);
 		break;
 	case NEED_ARG:
-		printf("%s: option '--%s' requires an argument\n", exec_name, opt);
+		printf("%s: option '%s' requires an argument\n", exec_name, opt);
+		break;
+	case ERR_ARG:
+		printf("%s: option '%s' invalid argument \n", exec_name, opt);
+		break;
 	}
+
 	printf("Try 'ping --help' or 'ping --usage' for more information.\n");
 }
 
diff --git a/src/main.c b/src/main.c
index b3e7aa9..24a8c08 100644
--- a/src/main.c
+++ b/src/main.c
@@ -11,7 +11,7 @@ char *exec_name;
 void init_args_t(args_t *args) {
 	OPT_WHILE {
 		args->opts[i] = false;
-		args->arg[i] = NULL;
+		args->arg[i] = 0;
 		i++;
 	}
 	args->hosts = NULL;
@@ -31,10 +31,8 @@ int handle_options(args_t *args, char **av) {
 		print_help();
 		return EXIT_SUCCESS;
 	} else {
-		for (int i = 0; args->hosts[i] != NULL; ++i)
-			printf("%s\n", args->hosts[i]);
+		return send_ping(args);
 	}
-	return EXIT_SUCCESS;
 }
 
 int main(int ac, char **av) {
diff --git a/src/send_ping.c b/src/send_ping.c
new file mode 100644
index 0000000..f5a68c2
--- /dev/null
+++ b/src/send_ping.c
@@ -0,0 +1,5 @@
+#include <opt_parse.h>
+
+int send_ping(args_t *args) {
+
+}