diff --git a/includes/cli.h b/includes/cli.h
index b4f673b..0b641d9 100644
--- a/includes/cli.h
+++ b/includes/cli.h
@@ -45,4 +45,7 @@ int	cli_handle_ttl(const char *arg, t_ping_config *config);
 int	cli_handle_version(const char *arg, t_ping_config *config);
 int	cli_handle_verbose(const char *arg, t_ping_config *config);
 
+int cli_parse_uint64(const char *s, uint64_t *out);
+int cli_parse_float(const char *s, float *out);
+
 #endif
diff --git a/sources.mk b/sources.mk
index b15435a..5fb000b 100644
--- a/sources.mk
+++ b/sources.mk
@@ -13,6 +13,8 @@ SRCS = $(SRC_DIR)/main.c \
 	   $(SRC_DIR)/cli/handlers/handle_ttl.c \
 	   $(SRC_DIR)/cli/handlers/handle_version.c \
 	   $(SRC_DIR)/cli/handlers/handle_verbose.c \
+	   $(SRC_DIR)/cli/utils/parse_int.c \
+	   $(SRC_DIR)/cli/utils/parse_float.c 
 
 TESTS_DIR = tests
 TESTS= $(TESTS_DIR)/test_main.c
diff --git a/src/cli/handlers/handle_count.c b/src/cli/handlers/handle_count.c
index 0a0029a..7f08a98 100644
--- a/src/cli/handlers/handle_count.c
+++ b/src/cli/handlers/handle_count.c
@@ -1,10 +1,22 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+
 #include "cli.h"
 #include "ft_ping.h"
 
 int
 cli_handle_count(const char *arg, t_ping_config *config)
 {
-	(void)arg;
-	(void)config;
+	uint64_t count;
+
+	if (0 != cli_parse_uint64(arg, &count))
+	{
+		dprintf(STDERR_FILENO, "Invalide count\n");
+		return CLI_ERROR;
+	}
+
+	config->count = count;
 	return CLI_SUCCESS;
 }
+
diff --git a/src/cli/handlers/handle_help.c b/src/cli/handlers/handle_help.c
index d143a26..c5a3b1c 100644
--- a/src/cli/handlers/handle_help.c
+++ b/src/cli/handlers/handle_help.c
@@ -1,9 +1,10 @@
-#include "cli.h"
-#include "ft_ping.h"
 #include <stddef.h>
 #include <stdio.h>
 #include <getopt.h>
 
+#include "cli.h"
+#include "ft_ping.h"
+
 /* Forward declarations */
 static const char * option_arg_type_to_str(t_option_arg_type type);
 /* -------------------- */
diff --git a/src/cli/handlers/handle_interval.c b/src/cli/handlers/handle_interval.c
index 804e434..99b6324 100644
--- a/src/cli/handlers/handle_interval.c
+++ b/src/cli/handlers/handle_interval.c
@@ -1,10 +1,20 @@
 #include "cli.h"
 #include "ft_ping.h"
 
+#include <unistd.h>
+#include <stdio.h>
+
 int
 cli_handle_interval(const char *arg, t_ping_config *config)
 {
-	(void)arg;
-	(void)config;
+	float interval;
+
+	if (0 != cli_parse_float(arg, &interval))
+	{
+		dprintf(STDERR_FILENO, "Invalide interval\n");
+		return CLI_ERROR;
+	}
+
+	config->interval = interval;
 	return CLI_SUCCESS;
 }
diff --git a/src/cli/handlers/handle_size.c b/src/cli/handlers/handle_size.c
index 0b9ca05..914f925 100644
--- a/src/cli/handlers/handle_size.c
+++ b/src/cli/handlers/handle_size.c
@@ -1,10 +1,21 @@
 #include "cli.h"
 #include "ft_ping.h"
 
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+
 int
 cli_handle_size(const char *arg, t_ping_config *config)
 {
-	(void)arg;
-	(void)config;
+	uint64_t size;
+
+	if (0 != cli_parse_uint64(arg, &size) || size > (65535 - 8))
+	{
+		dprintf(STDERR_FILENO, "Invalide size\n");
+		return CLI_ERROR;
+	}
+
+	config->count = size;
 	return CLI_SUCCESS;
 }
diff --git a/src/cli/handlers/handle_timeout.c b/src/cli/handlers/handle_timeout.c
index 6963523..be75aa5 100644
--- a/src/cli/handlers/handle_timeout.c
+++ b/src/cli/handlers/handle_timeout.c
@@ -1,10 +1,20 @@
 #include "cli.h"
 #include "ft_ping.h"
 
+#include <unistd.h>
+#include <stdio.h>
+
 int
 cli_handle_timeout(const char *arg, t_ping_config *config)
 {
-	(void)arg;
-	(void)config;
+	float TO;
+
+	if (0 != cli_parse_float(arg, &TO))
+	{
+		dprintf(STDERR_FILENO, "Invalide timeout\n");
+		return CLI_ERROR;
+	}
+
+	config->timeout = TO;
 	return CLI_SUCCESS;
 }
diff --git a/src/cli/handlers/handle_ttl.c b/src/cli/handlers/handle_ttl.c
index 18f9eb5..1e16c82 100644
--- a/src/cli/handlers/handle_ttl.c
+++ b/src/cli/handlers/handle_ttl.c
@@ -1,10 +1,21 @@
 #include "cli.h"
 #include "ft_ping.h"
 
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+
 int
 cli_handle_ttl(const char *arg, t_ping_config *config)
 {
-	(void)arg;
-	(void)config;
+	uint64_t ttl;
+
+	if (0 != cli_parse_uint64(arg, &ttl) || ttl > 255)
+	{
+		dprintf(STDERR_FILENO, "Invalide ttl\n");
+		return CLI_ERROR;
+	}
+
+	config->ttl = (uint8_t)ttl;
 	return CLI_SUCCESS;
 }
diff --git a/src/cli/handlers/handler_map.c b/src/cli/handlers/handler_map.c
index e2911fd..2e20c4d 100644
--- a/src/cli/handlers/handler_map.c
+++ b/src/cli/handlers/handler_map.c
@@ -1,6 +1,6 @@
+#include <getopt.h>
 
 #include "cli.h"
-#include <getopt.h>
 
 const t_option_descriptor g_options[] = {
 	{
diff --git a/src/cli/parse.c b/src/cli/parse.c
index 7e011e9..ad16060 100644
--- a/src/cli/parse.c
+++ b/src/cli/parse.c
@@ -1,6 +1,7 @@
 #include <stddef.h>
 #include <string.h>
 #include <getopt.h>
+
 #include "cli.h"
 #include "ft_ping.h"
 #include "ft_ping_const.h"
diff --git a/src/cli/utils/parse_float.c b/src/cli/utils/parse_float.c
new file mode 100644
index 0000000..ef9c55c
--- /dev/null
+++ b/src/cli/utils/parse_float.c
@@ -0,0 +1,22 @@
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <math.h>
+
+int
+cli_parse_float(const char *s, float *out)
+{
+    char *end;
+
+	if (NULL == s || '\0' == *s || '-' == *s)
+        return 1;
+
+    errno = 0;
+    float v = strtof(s, &end);
+
+	if (s == end || ERANGE == errno || '\0' != *end || 0 == isfinite(v))
+        return 1;
+
+    *out = v;
+    return 0;
+}
diff --git a/src/cli/utils/parse_int.c b/src/cli/utils/parse_int.c
new file mode 100644
index 0000000..182010d
--- /dev/null
+++ b/src/cli/utils/parse_int.c
@@ -0,0 +1,22 @@
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <stddef.h>
+
+int
+cli_parse_uint64(const char *s, uint64_t *out)
+{
+	char *end;
+
+	if ( NULL == s || '\0' == *s || '-' == *s)
+		return 1;
+
+	errno = 0;
+	const uintmax_t v =(uintmax_t)strtoumax(s, &end, 10);
+
+	if (s == end || ERANGE == errno || '\0' != *end || v > UINT64_MAX)
+		return 1;
+
+	*out = (uint64_t)v;
+	return 0;
+}