diff --git a/inc/libft_network.h b/inc/libft_network.h
index 8154da6..db0363c 100644
--- a/inc/libft_network.h
+++ b/inc/libft_network.h
@@ -6,13 +6,14 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2022/11/09 00:48:48 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/26 01:22:11 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/13 20:46:37 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #ifndef LIBFT_NETWORK_H
 # define LIBFT_NETWORK_H
 
+# include "libft_network/socket.h"
 # include "libft_network/ipv4.h"
 # include "libft_network/packet.h"
 
diff --git a/inc/libft_network/ipv4.h b/inc/libft_network/ipv4.h
index e254bfb..5e1ff4c 100644
--- a/inc/libft_network/ipv4.h
+++ b/inc/libft_network/ipv4.h
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2022/11/09 00:48:48 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/28 23:39:37 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/12 16:50:48 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -64,7 +64,7 @@
 // # define		DNS_CLASS_CH	3
 // # define		DNS_CLASS_HS	4
 
-# define DNS_ADDR				0x08080808
+# define DNS_DEFAULT_ADDR		0x08080808
 # define DNS_DST_PORT			53
 # define DNS_SRC_PORT			0x1234
 # define DNS_TTL				64
@@ -148,6 +148,9 @@ void				ft_ntop(t_bin pf, t_int4 ip, char *ip_str);
 // network/ipv4/ft_putip_fd.c
 t_size				ft_putip_fd(t_int4 n, int fd);
 
+// network/ipv4/get_nameserver.c
+t_int4				get_dns_nameserver(void);
+
 // network/ipv4/htoi4_socket/init_packet.c
 t_packet			ft_htoi4_init_packet(char *domain);
 
diff --git a/inc/libft_network/socket.h b/inc/libft_network/socket.h
new file mode 100644
index 0000000..c92a821
--- /dev/null
+++ b/inc/libft_network/socket.h
@@ -0,0 +1,67 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   socket.h                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2022/11/09 00:48:48 by brda-sil          #+#    #+#             */
+/*   Updated: 2024/08/13 21:27:15 by brda-sil         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef LIBFT_NETWORK_SOCKET_H
+# define LIBFT_NETWORK_SOCKET_H
+
+/* ########################################################################## */
+/* REQUIREMENTS */
+/* ############ */
+
+# include "libft_define.h"
+
+/* ########################################################################## */
+
+/* ########################################################################## */
+/* CONFIG */
+/* ###### */
+
+# define FT_SOCKET_MAX 0x80
+
+/* ########################################################################## */
+
+/* ########################################################################## */
+/* STRUCT */
+/* ###### */
+typedef t_int32 t_socket_id;
+
+/* ########################################################################## */
+
+
+/* ########################################################################## */
+/* FILES */
+/* ##### */
+
+// network/socket/ft_socket.c
+int				ft_socket(int domain, int type, int protocol);
+
+// network/socket/ft_socket_get.c
+int				ft_socket_get(t_socket_id index);
+int				*ft_socket_get_new();
+t_socket_id		ft_socket_get_index(int sock);
+
+// network/socket/ft_socket_singletone.c
+int				*ft_socket_sing_get();
+void			ft_socket_sing_free();
+
+// network/socket/setsockopt/bind_interface.c
+t_bool			ft_setsockopt_bind_interface(int sock, char *interface);
+
+// network/socket/setsockopt/ipheader.c
+t_bool			ft_setsockopt_ipheader(int sock);
+
+// network/socket/setsockopt/timeout.c
+t_bool			ft_setsockopt_timeout(int sock, int timeout);
+
+/* ########################################################################## */
+
+#endif /* LIBFT_NETWORK_SOCKET_H */
diff --git a/mk/config.mk b/mk/config.mk
index 9fb63f2..095fed8 100644
--- a/mk/config.mk
+++ b/mk/config.mk
@@ -155,6 +155,12 @@ MULTIPLE		:= 1
 # dependecies
 # PRINT			:= 1
 endif
+ifeq ($(findstring net_pack,$(MAKECMDGOALS)),net_sock)
+NET_SOCK		:= 1
+MULTIPLE		:= 1
+# dependecies
+# PRINT			:= 1
+endif
 ifeq ($(findstring error,$(MAKECMDGOALS)),error)
 ERROR			:= 1
 MULTIPLE		:= 1
diff --git a/mk/srcs.mk b/mk/srcs.mk
index 45a7be6..697f3f6 100644
--- a/mk/srcs.mk
+++ b/mk/srcs.mk
@@ -188,6 +188,7 @@ SRC_NET_IPV4 := network/ipv4/ft_getip_str.c \
 				network/ipv4/ft_ntohs.c \
 				network/ipv4/ft_ntop.c \
 				network/ipv4/ft_putip_fd.c \
+				network/ipv4/get_nameserver.c \
 				network/ipv4/htoi4_socket/init_packet.c \
 				network/ipv4/htoi4_socket/init_socket.c \
 				network/ipv4/htoi4_socket/main.c \
@@ -225,7 +226,15 @@ SRC_NET_PACK := network/packet/checksum.c \
 				network/packet/udp/get.c \
 				network/packet/udp/print.c
 
-SRC_NET := $(SRC_NET_IPV4) $(SRC_NET_PACK)
+#### SOCKET
+SRC_NET_SOCK := network/socket/ft_socket.c \
+				network/socket/ft_socket_get.c \
+				network/socket/ft_socket_singletone.c \
+				network/socket/setsockopt/bind_interface.c \
+				network/socket/setsockopt/ipheader.c \
+				network/socket/setsockopt/timeout.c
+
+SRC_NET := $(SRC_NET_IPV4) $(SRC_NET_PACK) $(SRC_NET_SOCK)
 
 ### ERROR
 SRC_UNI_TEST := unit_test/ft_assert.c
@@ -300,6 +309,9 @@ endif
 ifeq ($(NET_PACK),1)
 SRC_C			+= $(SRC_NET_PACK)
 endif
+ifeq ($(NET_SOCK),1)
+SRC_C			+= $(SRC_NET_SOCK)
+endif
 ifeq ($(UNIT_TEST),1)
 SRC_C			+= $(SRC_UNI_TEST)
 endif
diff --git a/rsc/helper b/rsc/helper
index d12c71e..b75dbf9 160000
--- a/rsc/helper
+++ b/rsc/helper
@@ -1 +1 @@
-Subproject commit d12c71e12cfefbfda32b8067aaf4edf1d23a017e
+Subproject commit b75dbf9804c90291bdc2b11b37ed6a0e5f388d83
diff --git a/src/input/ft_get_next_line.c b/src/input/ft_get_next_line.c
index 842a057..048e61c 100644
--- a/src/input/ft_get_next_line.c
+++ b/src/input/ft_get_next_line.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2022/07/05 01:18:23 by brda-sil          #+#    #+#             */
-/*   Updated: 2022/12/28 12:47:38 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/12 16:03:20 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -70,12 +70,33 @@ static void	get_line(char **line, char **buff)
 	push_buff(buff, len_line);
 }
 
+static void	flush_buffer(char **buff)
+{
+	int	counter;
+
+	counter = 0;
+	while (counter < MAX_FD)
+	{
+		if (buff[counter])
+		{
+			free(buff[counter]);
+			buff[counter] = FT_NULL;
+		}
+		counter++;
+	}
+}
+
 char	*ft_get_next_line(int fd)
 {
 	static char	*buff[MAX_FD] = {FT_NULL};
 	char		*line;
 
-	if (fd < 0 || BUFFER_SIZE < 1)
+	if (fd == -2)
+	{
+		flush_buffer(buff);
+		return (FT_NULL);
+	}
+	else if (fd < 0 || BUFFER_SIZE < 1)
 		return (FT_NULL);
 	if (buff[fd] == FT_NULL)
 		buff[fd] = (char *)ft_calloc(sizeof(char), BUFFER_SIZE + 1);
diff --git a/src/network/ipv4/get_nameserver.c b/src/network/ipv4/get_nameserver.c
new file mode 100644
index 0000000..740c2f2
--- /dev/null
+++ b/src/network/ipv4/get_nameserver.c
@@ -0,0 +1,51 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   get_nameserver.c                                   :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/08/12 15:06:04 by brda-sil          #+#    #+#             */
+/*   Updated: 2024/08/13 10:10:19 by brda-sil         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft_network.h"
+#include "libft_input.h"
+#include <fcntl.h>
+
+t_int4	get_dns_nameserver(void)
+{
+	int		fd;
+	char*	line;
+	char**	splitted;
+	t_int4	ip;
+
+	fd = open("/etc/resolv.conf", O_RDONLY);
+	if (fd < 0)
+		return (0);
+	while (TRUE)
+	{
+		line = ft_get_next_line(fd);
+		if (!line)
+		{
+			free(line);
+			break ;
+		}
+		else if (ft_strncmp(line, "nameserver", 10))
+		{
+			free(line);
+			continue ;
+		}
+		break;
+	}
+	ft_get_next_line(-2);
+	close(fd);
+	splitted = ft_split(line, ' ');
+	free(line);
+	splitted[1][ft_strlen(splitted[1]) - 1] = '\0';
+	ip = ft_ipstr(splitted[1]);
+	ft_free_char_pp(splitted);
+	ip = ip? ip: DNS_DEFAULT_ADDR;
+	return (ft_htonl(ip));
+}
diff --git a/src/network/ipv4/htoi4_socket/init_packet.c b/src/network/ipv4/htoi4_socket/init_packet.c
index ba56be0..c90c3f8 100644
--- a/src/network/ipv4/htoi4_socket/init_packet.c
+++ b/src/network/ipv4/htoi4_socket/init_packet.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/26 00:03:48 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/27 11:35:29 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/12 16:39:59 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -27,7 +27,7 @@ t_packet	ft_htoi4_init_packet(char *domain)
 	pkt_ip->fragment_off = ft_htons(ft_pkt_fragment_offset(IPHDR_F_DONT_FRAG, 0));
 	pkt_ip->ttl = DNS_TTL;
 	pkt_ip->protocol = IPPROTO_UDP;
-	pkt_ip->dst_addr = ft_htonl(DNS_ADDR);
+	pkt_ip->dst_addr = get_dns_nameserver();
 	pkt_udp = ft_pkt_get_udp(&pkt);
 	pkt_udp->src_port = ft_htons(DNS_SRC_PORT);
 	pkt_udp->dst_port = ft_htons(DNS_DST_PORT);
diff --git a/src/network/ipv4/htoi4_socket/init_socket.c b/src/network/ipv4/htoi4_socket/init_socket.c
index 863dc11..79afd0e 100644
--- a/src/network/ipv4/htoi4_socket/init_socket.c
+++ b/src/network/ipv4/htoi4_socket/init_socket.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/26 00:00:53 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/26 01:23:49 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/13 21:23:28 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,24 +14,20 @@
 
 int	ft_htoi4_init_socket(void)
 {
-	int				sock;
-	struct timeval	tv;
+	int	sock;
 
-	sock = socket(PF_INET, SOCK_RAW, IPPROTO_UDP);
+	sock = ft_socket(PF_INET, SOCK_RAW, IPPROTO_UDP);
 	if (sock == -1)
 	{
 		ft_perr("ft_htoi4_init_socket: Permission denied\n");
 		return (sock);
 	}
-	tv.tv_usec = DNS_TIMEOUT % A_SEC;
-	tv.tv_sec = DNS_TIMEOUT / A_SEC;
-	if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1)
+	if (ft_setsockopt_timeout(sock, DNS_TIMEOUT))
 	{
 		ft_perr("ft_htoi4_init_socket: SO_RCVTIMEO\n");
 		return (sock);
 	}
-	if (setsockopt(sock, IPPROTO_IP, IP_HDRINCL, (int [1]){1}, \
-															sizeof(int)) == -1)
+	if (ft_setsockopt_ipheader(sock))
 	{
 		ft_perr("ft_htoi4_init_socket: IP_HDRINCL\n");
 		return (sock);
diff --git a/src/network/ipv4/htoi4_socket/main.c b/src/network/ipv4/htoi4_socket/main.c
index 071a399..172e715 100644
--- a/src/network/ipv4/htoi4_socket/main.c
+++ b/src/network/ipv4/htoi4_socket/main.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/25 23:56:34 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/26 02:07:58 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/13 20:50:26 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,20 +14,17 @@
 
 t_int4	ft_htoi4_socket(char *domain)
 {
-	t_int4		ip;
-	int			sock;
-	t_packet	pkt;
+	t_int4				ip;
+	static int			sock = -2;
+	t_packet			pkt;
 
-	sock = ft_htoi4_init_socket();
+	if (sock == -2)
+		sock = ft_htoi4_init_socket();
 	if (sock == -1)
 		return (0);
-
 	pkt = ft_htoi4_init_packet(domain);
-
 	if (ft_htoi4_send_packet(sock, pkt))
 		return (0);
 	ip = ft_htoi4_recv_packet(sock);
-	if (sock != -1)
-		close(sock);
 	return (ip);
 }
diff --git a/src/network/ipv4/htoi4_socket/recv_packet.c b/src/network/ipv4/htoi4_socket/recv_packet.c
index 8b7505e..7c6d24d 100644
--- a/src/network/ipv4/htoi4_socket/recv_packet.c
+++ b/src/network/ipv4/htoi4_socket/recv_packet.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/26 00:22:20 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/28 23:50:07 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/13 09:40:12 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -38,7 +38,7 @@ static t_bool	recv_reply(int sock, t_packet *pong_pkt)
 		PACK_MAX_LEN,			// LEN
 		0,						// FLAG
 		FT_NULL,				// SOCK ADDR FROM
-		0						// SOCK ADDR FROM LEN
+		FT_NULL					// SOCK ADDR FROM LEN
 	);
 	return (ret == -1);
 }
diff --git a/src/network/ipv4/htoi4_socket/send_packet.c b/src/network/ipv4/htoi4_socket/send_packet.c
index ef531e4..6d6c525 100644
--- a/src/network/ipv4/htoi4_socket/send_packet.c
+++ b/src/network/ipv4/htoi4_socket/send_packet.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/26 00:18:13 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/26 01:23:43 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/12 16:43:43 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -16,8 +16,10 @@ int	ft_htoi4_send_packet(int socket, t_packet pkt)
 {
 	long			ret;
 	struct sockaddr	dst;
+	t_iphdr			*pkt_ip;
 
-	dst = ft_ltoaddr(DNS_ADDR);
+	pkt_ip = ft_pkt_get_ip(&pkt);
+	dst = ft_ltoaddr(pkt_ip->dst_addr);
 	ret = sendto(
 		socket,
 		pkt.data,
diff --git a/src/network/ipv4/i4toh_socket/init_packet.c b/src/network/ipv4/i4toh_socket/init_packet.c
index 0a4f0c2..16c295b 100644
--- a/src/network/ipv4/i4toh_socket/init_packet.c
+++ b/src/network/ipv4/i4toh_socket/init_packet.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/26 00:03:48 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/27 13:47:26 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/12 16:44:38 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -27,7 +27,7 @@ t_packet	ft_i4toh_init_packet(t_int4 ip)
 	pkt_ip->fragment_off = ft_htons(ft_pkt_fragment_offset(IPHDR_F_DONT_FRAG, 0));
 	pkt_ip->ttl = DNS_TTL;
 	pkt_ip->protocol = IPPROTO_UDP;
-	pkt_ip->dst_addr = ft_htonl(DNS_ADDR);
+	pkt_ip->dst_addr = get_dns_nameserver();
 	pkt_udp = ft_pkt_get_udp(&pkt);
 	pkt_udp->src_port = ft_htons(DNS_SRC_PORT);
 	pkt_udp->dst_port = ft_htons(DNS_DST_PORT);
diff --git a/src/network/ipv4/i4toh_socket/init_socket.c b/src/network/ipv4/i4toh_socket/init_socket.c
index 9810051..6dc6eb3 100644
--- a/src/network/ipv4/i4toh_socket/init_socket.c
+++ b/src/network/ipv4/i4toh_socket/init_socket.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/26 00:00:53 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/27 11:24:22 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/13 21:23:46 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,26 +14,22 @@
 
 int	ft_i4toh_init_socket(void)
 {
-	int				sock;
-	struct timeval	tv;
+	int	sock;
 
-	sock = socket(PF_INET, SOCK_RAW, IPPROTO_UDP);
+	sock = ft_socket(PF_INET, SOCK_RAW, IPPROTO_UDP);
 	if (sock == -1)
 	{
-		ft_perr("ft_i4toh_init_socket: Permission denied\n");
+		ft_perr("ft_htoi4_init_socket: Permission denied\n");
 		return (sock);
 	}
-	tv.tv_usec = DNS_TIMEOUT % A_SEC;
-	tv.tv_sec = DNS_TIMEOUT / A_SEC;
-	if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1)
+	if (ft_setsockopt_timeout(sock, DNS_TIMEOUT))
 	{
-		ft_perr("ft_i4toh_init_socket: SO_RCVTIMEO\n");
+		ft_perr("ft_htoi4_init_socket: SO_RCVTIMEO\n");
 		return (sock);
 	}
-	if (setsockopt(sock, IPPROTO_IP, IP_HDRINCL, (int [1]){1}, \
-															sizeof(int)) == -1)
+	if (ft_setsockopt_ipheader(sock))
 	{
-		ft_perr("ft_i4toh_init_socket: IP_HDRINCL\n");
+		ft_perr("ft_htoi4_init_socket: IP_HDRINCL\n");
 		return (sock);
 	}
 	return (sock);
diff --git a/src/network/ipv4/i4toh_socket/main.c b/src/network/ipv4/i4toh_socket/main.c
index 76114aa..cc82b11 100644
--- a/src/network/ipv4/i4toh_socket/main.c
+++ b/src/network/ipv4/i4toh_socket/main.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/25 23:56:34 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/27 12:33:41 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/13 20:52:45 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,11 +14,12 @@
 
 char	*ft_i4toh_socket(t_int4 ip)
 {
-	int			sock;
+	static int	sock = -2;
 	t_packet	pkt;
 	char		*name;
 
-	sock = ft_i4toh_init_socket();
+	if (sock == -2)
+		sock = ft_i4toh_init_socket();
 	if (sock == -1)
 		return (0);
 
@@ -28,8 +29,5 @@ char	*ft_i4toh_socket(t_int4 ip)
 	if (ft_i4toh_send_packet(sock, pkt))
 		return (0);
 	name = ft_i4toh_recv_packet(sock);
-
-	if (sock != -1)
-		close(sock);
 	return (name);
 }
diff --git a/src/network/ipv4/i4toh_socket/send_packet.c b/src/network/ipv4/i4toh_socket/send_packet.c
index d169c93..e396d8a 100644
--- a/src/network/ipv4/i4toh_socket/send_packet.c
+++ b/src/network/ipv4/i4toh_socket/send_packet.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/26 00:18:13 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/27 12:03:00 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/12 16:45:25 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -16,8 +16,10 @@ int	ft_i4toh_send_packet(int socket, t_packet pkt)
 {
 	long			ret;
 	struct sockaddr	dst;
+	t_iphdr			*pkt_ip;
 
-	dst = ft_ltoaddr(DNS_ADDR);
+	pkt_ip = ft_pkt_get_ip(&pkt);
+	dst = ft_ltoaddr(pkt_ip->dst_addr);
 	ret = sendto(
 		socket,
 		pkt.data,
diff --git a/src/network/socket/ft_socket.c b/src/network/socket/ft_socket.c
new file mode 100644
index 0000000..f6807ff
--- /dev/null
+++ b/src/network/socket/ft_socket.c
@@ -0,0 +1,26 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_socket.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/08/13 19:29:43 by brda-sil          #+#    #+#             */
+/*   Updated: 2024/08/13 22:04:13 by brda-sil         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft_network.h"
+
+int	ft_socket(int domain, int type, int protocol)
+{
+	int			*sock;
+
+	sock = ft_socket_get_new();
+	if (sock == (void *)-1)
+		return (-1);
+	*sock = socket(domain, type, protocol);
+	if (*sock == -1)
+		return (-1);
+	return (*sock);
+}
diff --git a/src/network/socket/ft_socket_get.c b/src/network/socket/ft_socket_get.c
new file mode 100644
index 0000000..ea028bd
--- /dev/null
+++ b/src/network/socket/ft_socket_get.c
@@ -0,0 +1,59 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_socket_get.c                                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/08/13 19:29:43 by brda-sil          #+#    #+#             */
+/*   Updated: 2024/08/13 20:39:53 by brda-sil         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft_network.h"
+
+int ft_socket_get(t_socket_id index)
+{
+	int	*socks;
+
+	socks = ft_socket_sing_get();
+	if (socks == FT_NULL)
+		return (-1);
+	return (socks[index]);
+}
+
+int *ft_socket_get_new()
+{
+	int			index;
+	int			*socks;
+
+	socks = ft_socket_sing_get();
+	if (socks == FT_NULL)
+		return ((void *)-1);
+	index = 0;
+	while (index < FT_SOCKET_MAX)
+	{
+		if (socks[index] == -1)
+			return (&socks[index]);
+		index++;
+	}
+	return ((void *)-1);
+}
+
+t_socket_id	ft_socket_get_index(int sock)
+{
+	t_socket_id	index;
+	int			*socks;
+
+	socks = ft_socket_sing_get();
+	if (socks == FT_NULL)
+		return (-1);
+	index = 0;
+	while (index < FT_SOCKET_MAX)
+	{
+		if (sock == socks[index])
+			return (index);
+		index++;
+	}
+	return (-1);
+}
diff --git a/src/network/socket/ft_socket_singletone.c b/src/network/socket/ft_socket_singletone.c
new file mode 100644
index 0000000..a3927f1
--- /dev/null
+++ b/src/network/socket/ft_socket_singletone.c
@@ -0,0 +1,53 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_socket_singletone.c                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/08/13 20:35:47 by brda-sil          #+#    #+#             */
+/*   Updated: 2024/08/13 20:54:06 by brda-sil         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft_network.h"
+
+int	*ft_socket_sing_get()
+{
+	static	int	*socks = FT_NULL;
+	int	index;
+
+	if (socks == FT_NULL)
+	{
+		socks = (int *)malloc(sizeof(int) * FT_SOCKET_MAX);
+		if (socks == FT_NULL)
+			return (FT_NULL);
+		index = 0;
+		while (index < FT_SOCKET_MAX)
+		{
+			socks[index] = -1;
+			index++;
+		}
+		atexit(ft_socket_sing_free);
+	}
+	return (socks);
+}
+
+void	ft_socket_sing_free()
+{
+	int			*socks;
+	t_socket_id	index;
+
+	socks = ft_socket_sing_get();
+
+	if (socks == FT_NULL)
+		return ;
+	index = 0;
+	while (index < FT_SOCKET_MAX)
+	{
+		if (socks[index] != -1)
+			close(socks[index]);
+		index++;
+	}
+	free(socks);
+}
diff --git a/src/network/socket/setsockopt/bind_interface.c b/src/network/socket/setsockopt/bind_interface.c
new file mode 100644
index 0000000..37822f4
--- /dev/null
+++ b/src/network/socket/setsockopt/bind_interface.c
@@ -0,0 +1,22 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   bind_interface.c                                   :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/08/13 19:30:05 by brda-sil          #+#    #+#             */
+/*   Updated: 2024/08/13 21:22:25 by brda-sil         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft_network.h"
+
+t_bool ft_setsockopt_bind_interface(int sock, char *interface)
+{
+	return (
+		setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
+			interface, ft_strlen(interface))
+				== -1
+	);
+}
diff --git a/src/network/socket/setsockopt/ipheader.c b/src/network/socket/setsockopt/ipheader.c
new file mode 100644
index 0000000..4eb1fa3
--- /dev/null
+++ b/src/network/socket/setsockopt/ipheader.c
@@ -0,0 +1,21 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ipheader.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/08/13 19:30:05 by brda-sil          #+#    #+#             */
+/*   Updated: 2024/08/13 21:22:35 by brda-sil         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft_network.h"
+
+t_bool ft_setsockopt_ipheader(int sock)
+{
+	return (
+		setsockopt(sock, IPPROTO_IP, IP_HDRINCL, (int [1]){1}, sizeof(int))
+			== -1
+	);
+}
diff --git a/src/network/socket/setsockopt/timeout.c b/src/network/socket/setsockopt/timeout.c
new file mode 100644
index 0000000..7bd8b8d
--- /dev/null
+++ b/src/network/socket/setsockopt/timeout.c
@@ -0,0 +1,22 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   timeout.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/08/13 19:30:05 by brda-sil          #+#    #+#             */
+/*   Updated: 2024/08/13 21:22:50 by brda-sil         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft_network.h"
+
+t_bool ft_setsockopt_timeout(int sock, int timeout)
+{
+	struct timeval	tv;
+
+	tv.tv_sec = timeout / A_SEC;
+	tv.tv_usec = timeout % A_SEC;
+	return (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1);
+}
diff --git a/src/parsing/ft_opt_free.c b/src/parsing/ft_opt_free.c
index 992ceb4..b544a71 100644
--- a/src/parsing/ft_opt_free.c
+++ b/src/parsing/ft_opt_free.c
@@ -1,12 +1,12 @@
 /* ************************************************************************** */
 /*                                                                            */
 /*                                                        :::      ::::::::   */
-/*   ft_optfree.c                                       :+:      :+:    :+:   */
+/*   ft_opt_free.c                                      :+:      :+:    :+:   */
 /*                                                    +:+ +:+         +:+     */
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/10/24 15:09:03 by brda-sil          #+#    #+#             */
-/*   Updated: 2023/11/14 06:50:43 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/13 19:19:55 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
diff --git a/src/parsing/ft_opt_parse.c b/src/parsing/ft_opt_parse.c
index 6af2ef5..1634d2d 100644
--- a/src/parsing/ft_opt_parse.c
+++ b/src/parsing/ft_opt_parse.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/10/24 14:30:54 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/04/01 04:28:54 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/13 19:18:09 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -50,4 +50,5 @@ void	ft_optparse(int ac, char **av)
 			break ;
 		opts->parse_index++;
 	}
+	atexit(ft_free_opts);
 }
diff --git a/test/src/htoi4.c b/test/src/htoi4.c
index 7dd9dbc..9abbd49 100644
--- a/test/src/htoi4.c
+++ b/test/src/htoi4.c
@@ -6,7 +6,7 @@
 /*   By: brda-sil <brda-sil@students.42angouleme    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/05/25 13:22:28 by brda-sil          #+#    #+#             */
-/*   Updated: 2024/05/28 21:24:40 by brda-sil         ###   ########.fr       */
+/*   Updated: 2024/08/13 21:16:09 by brda-sil         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -47,6 +47,8 @@ int	ci_test(void)
 	ret = 0;
 	ret += test_domain("www.google.com");
 	ret += test_domain("google.com");
+	ret += test_domain("localhost");
+	ret += test_not_working_domain("255.255.255.255");
 	ret += test_not_working_domain("google");		// SOA response
 	ret += test_not_working_domain("google.");		// SOA response
 	ret += test_not_working_domain("google..");		// SOA response