diff --git a/kernel/mars_client.c b/kernel/mars_client.c
index 76ab1e4a..e05da44c 100644
--- a/kernel/mars_client.c
+++ b/kernel/mars_client.c
@@ -145,9 +145,19 @@ int _setup_channel(struct client_bundle *bundle, int ch_nr)
 		goto done;
 	}
 
+	if (!bundle->params) {
+		struct sockaddr_in *_sockaddr = (void*)&sockaddr;
+
+		int offset = (int)ntohs(_sockaddr->sin_port) - mars_net_default_port;
+
+		if (offset < 0 || offset >= MARS_TRAFFIC_MAX)
+			offset = 0;
+		bundle->params = &mars_tcp_params[offset];
+	}
+
 	status = mars_create_socket(&ch->socket,
 				    &sockaddr,
-				    &default_tcp_params,
+				    bundle->params,
 				    false);
 	if (unlikely(status < 0)) {
 		MARS_DBG("no socket, status = %d\n", status);
diff --git a/kernel/mars_client.h b/kernel/mars_client.h
index 89af5bb6..4dd032be 100644
--- a/kernel/mars_client.h
+++ b/kernel/mars_client.h
@@ -81,6 +81,7 @@ struct client_channel {
 struct client_bundle {
 	char *host;
 	char *path;
+	struct mars_tcp_params *params;
 	int thread_count;
 	int old_channel;
 	wait_queue_head_t sender_event;
diff --git a/kernel/mars_net.c b/kernel/mars_net.c
index 1d3db62d..7ad50328 100644
--- a/kernel/mars_net.c
+++ b/kernel/mars_net.c
@@ -74,16 +74,35 @@ module_param_named(mars_port, mars_net_default_port, int, 0);
  * TODO: add compression / encryption.
  */
 
-struct mars_tcp_params default_tcp_params = {
-	.ip_tos = IPTOS_LOWDELAY,
-	.tcp_window_size = 8 * 1024 * 1024, // for long distance replications
-	.tcp_nodelay = 0,
-	.tcp_timeout = 2,
-	.tcp_keepcnt = 3,
-	.tcp_keepintvl = 3, // keepalive ping time
-	.tcp_keepidle = 4,
+struct mars_tcp_params mars_tcp_params[MARS_TRAFFIC_MAX] = {
+	[MARS_TRAFFIC_META] = {
+		.ip_tos = IPTOS_LOWDELAY,
+		.tcp_window_size = 8 * 1024 * 1024,
+		.tcp_nodelay = 0,
+		.tcp_timeout = 2,
+		.tcp_keepcnt = 3,
+		.tcp_keepintvl = 3,
+		.tcp_keepidle = 4,
+	},
+	[MARS_TRAFFIC_REPLICATION] = {
+		.ip_tos = IPTOS_RELIABILITY,
+		.tcp_window_size = 8 * 1024 * 1024,
+		.tcp_nodelay = 0,
+		.tcp_timeout = 2,
+		.tcp_keepcnt = 3,
+		.tcp_keepintvl = 3,
+		.tcp_keepidle = 4,
+	},
+	[MARS_TRAFFIC_SYNC] = {
+		.ip_tos = IPTOS_MINCOST,
+		.tcp_window_size = 8 * 1024 * 1024,
+		.tcp_nodelay = 0,
+		.tcp_timeout = 2,
+		.tcp_keepcnt = 3,
+		.tcp_keepintvl = 3,
+		.tcp_keepidle = 4,
+	},
 };
-EXPORT_SYMBOL(default_tcp_params);
 
 static
 void __setsockopt(struct socket *sock, int level, int optname, char *optval, int optsize)
diff --git a/kernel/mars_net.h b/kernel/mars_net.h
index 0c50d4b4..ceb78015 100644
--- a/kernel/mars_net.h
+++ b/kernel/mars_net.h
@@ -86,8 +86,6 @@ struct mars_tcp_params {
 	int tcp_keepidle;
 };
 
-extern struct mars_tcp_params default_tcp_params;
-
 enum mars_traffic_types {
 	MARS_TRAFFIC_META,
 	MARS_TRAFFIC_REPLICATION,
@@ -95,6 +93,8 @@ enum mars_traffic_types {
 	MARS_TRAFFIC_MAX /* this must come last */
 };
 
+extern struct mars_tcp_params mars_tcp_params[MARS_TRAFFIC_MAX];
+
 enum {
 	CMD_NOP,
 	CMD_NOTIFY,
diff --git a/kernel/mars_server.c b/kernel/mars_server.c
index 20dcbd04..abf3671e 100644
--- a/kernel/mars_server.c
+++ b/kernel/mars_server.c
@@ -49,13 +49,13 @@ struct server_cookie {
 
 static struct server_cookie server_cookie[MARS_TRAFFIC_MAX] = {
 	[MARS_TRAFFIC_META] = {
-		.server_params = &default_tcp_params,
+		.server_params = &mars_tcp_params[MARS_TRAFFIC_META],
 	},
 	[MARS_TRAFFIC_REPLICATION] = {
-		.server_params = &default_tcp_params,
+		.server_params = &mars_tcp_params[MARS_TRAFFIC_REPLICATION],
 	},
 	[MARS_TRAFFIC_SYNC] = {
-		.server_params = &default_tcp_params,
+		.server_params = &mars_tcp_params[MARS_TRAFFIC_SYNC],
 	},
 };
 
diff --git a/kernel/sy_old/mars_main.c b/kernel/sy_old/mars_main.c
index f82b91aa..fcb9b7d0 100644
--- a/kernel/sy_old/mars_main.c
+++ b/kernel/sy_old/mars_main.c
@@ -2276,7 +2276,7 @@ int peer_thread(void *data)
 
 			status = mars_create_socket(&peer->socket,
 						    &sockaddr,
-						    &default_tcp_params,
+						    &mars_tcp_params[MARS_TRAFFIC_META],
 						    false);
 			if (unlikely(status < 0)) {
 				MARS_INF("no connection to mars module on '%s' (%s) status = %d\n", peer->peer, real_peer, status);
diff --git a/kernel/sy_old/mars_proc.c b/kernel/sy_old/mars_proc.c
index 053ab4ca..9b132230 100644
--- a/kernel/sy_old/mars_proc.c
+++ b/kernel/sy_old/mars_proc.c
@@ -285,17 +285,25 @@ struct ctl_table io_tuning_table[] = {
 	{}
 };
 
-static
-struct ctl_table tcp_tuning_table[] = {
-	INT_ENTRY("ip_tos",          default_tcp_params.ip_tos,          0600),
-	INT_ENTRY("tcp_window_size", default_tcp_params.tcp_window_size, 0600),
-	INT_ENTRY("tcp_nodelay",     default_tcp_params.tcp_nodelay,     0600),
-	INT_ENTRY("tcp_timeout",     default_tcp_params.tcp_timeout,     0600),
-	INT_ENTRY("tcp_keepcnt",     default_tcp_params.tcp_keepcnt,     0600),
-	INT_ENTRY("tcp_keepintvl",   default_tcp_params.tcp_keepintvl,   0600),
-	INT_ENTRY("tcp_keepidle",    default_tcp_params.tcp_keepidle,    0600),
-	{}
-};
+#define TCP_ENTRY(NAME,TRAFFIC_TYPE)				\
+	INT_ENTRY(#NAME, mars_tcp_params[TRAFFIC_TYPE].NAME, 0600)
+
+#define make_tcp_tuning_table(TRAFFIC_TYPE)			\
+static								\
+struct ctl_table tcp_tuning_table_##TRAFFIC_TYPE[] = {		\
+	TCP_ENTRY(ip_tos, TRAFFIC_TYPE),			\
+	TCP_ENTRY(tcp_window_size, TRAFFIC_TYPE),		\
+	TCP_ENTRY(tcp_nodelay, TRAFFIC_TYPE),			\
+	TCP_ENTRY(tcp_timeout, TRAFFIC_TYPE),			\
+	TCP_ENTRY(tcp_keepcnt, TRAFFIC_TYPE),	       		\
+	TCP_ENTRY(tcp_keepintvl, TRAFFIC_TYPE),	       		\
+	TCP_ENTRY(tcp_keepidle, TRAFFIC_TYPE),	       		\
+	{}							\
+}
+
+make_tcp_tuning_table(MARS_TRAFFIC_META);
+make_tcp_tuning_table(MARS_TRAFFIC_REPLICATION);
+make_tcp_tuning_table(MARS_TRAFFIC_SYNC);
 
 static
 struct ctl_table mars_table[] = {
@@ -416,9 +424,21 @@ struct ctl_table mars_table[] = {
 	},
 	{
 		_CTL_NAME
-		.procname	= "tcp_tuning",
+		.procname	= "tcp_tuning_0_meta_traffic",
 		.mode		= 0500,
-		.child = tcp_tuning_table,
+		.child = tcp_tuning_table_MARS_TRAFFIC_META,
+	},
+	{
+		_CTL_NAME
+		.procname	= "tcp_tuning_1_replication_traffic",
+		.mode		= 0500,
+		.child = tcp_tuning_table_MARS_TRAFFIC_REPLICATION,
+	},
+	{
+		_CTL_NAME
+		.procname	= "tcp_tuning_2_sync_traffic",
+		.mode		= 0500,
+		.child = tcp_tuning_table_MARS_TRAFFIC_SYNC,
 	},
 	{}
 };