diff --git a/TODO b/TODO
index 10bbf2ed..7403cc1c 100644
--- a/TODO
+++ b/TODO
@@ -1,104 +1,98 @@
 0.1
 ---
 
 compress: should only compress user data, we will add a bit in the data
           header to indicate if the pckt is compressed or not (save time).
           this approach allow runtime change of compress.
           open questions are: methods? level? zlib? lzo? bz? lzma? xz?
                               how much do we save by compressin our header?
                               custom compress callback_fn?
 
 cryto:    make api generic for different methods != nss to match compress
           review API and config to make sure we save memcpy
           also expand API to support dual key for rekey process.         
 
 compress must happen before encrypt
 
-link layer:
-
-we need a function to:
-void dst_cache_links_update(knet_host *host);
-that will order link_entries by priority/weight for RR.
-
 config: we need ato add config/vty for link_handler_policy, link_timeout and link_priority for active/passive
 
 Look into link status changes notification (maybe a signal to a thread? or write to a pipe)
 
 ring:
 
 * support 8 listener per node.
 * index pointer list
 
 general:
 
 * what to log
   log to file: who logins, config changes and link status changes
   log to vty: cmd execution failure
 
 * consider splitting tests/* based on what they test (tap_test -> libtap/) ?
 
 vty:
 
 * split cmd_files
 * basic show info
 * fix check_param for ip/prefix/crypto
 
 0.2
 ---
 
 libtap:
 
 * add man pages
 * improve tests to cover thread safety and more error codes
 
 0.3
 ---
 
 * benchmark tests:
   - all critical paths in ring.c
 
 0.4
 ---
 
 general:
 
 * add statistics
 * add init script / spec file
 * v4/v6 (bindv6only check via cli)
 
 vty:
 
 * add optional options
 * sorting
 * tab completion on options
 
 0.5
 ---
 
 * pong count
 
 0.6
 ---
 
 * dynip
 
 0.7
 ---
 
 * review ring api for libknetring shared lib
 * review tap api for libknettap shared lib
 * review vty api for libknetvty shared lib
 
 1.0-pre
 -------
 
 tests:
 
 * coverity
 * unit test:
   - test all public APIs
   - write ad-doc tests for internal complex functions
   - not required to test return codes from external libs directly
     (we are not testing glibc)
   - test all code paths we write
   - no 0.9/1.0 release without max testing coverage for the core
diff --git a/libknet/handle.c b/libknet/handle.c
index 49140695..7db47ca5 100644
--- a/libknet/handle.c
+++ b/libknet/handle.c
@@ -1,665 +1,683 @@
 #include "config.h"
 
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
 #include <pthread.h>
 #include <sys/epoll.h>
 
 #include "libknet-private.h"
 #include "nsscrypto.h"
 
 #define KNET_MAX_EVENTS 8
 #define KNET_PING_TIMERES 200000
 
 static void *_handle_tap_to_links_thread(void *data);
 static void *_handle_recv_from_links_thread(void *data);
 static void *_handle_heartbt_thread(void *data);
 static void *_handle_dst_link_handler_thread(void *data);
 
 knet_handle_t knet_handle_new(const struct knet_handle_cfg *knet_handle_cfg)
 {
 	knet_handle_t knet_h;
 	struct epoll_event ev;
 
 	/*
 	 * validate incoming config request
 	 */
 	if (knet_handle_cfg == NULL) {
 		errno = EINVAL;
 		return NULL;
 	}
 
 	if (knet_handle_cfg->fd <= 0) {
 		errno = EINVAL;
 		return NULL;
 	}
 
 	if ((knet_h = malloc(sizeof(struct knet_handle))) == NULL)
 		return NULL;
 
 	memset(knet_h, 0, sizeof(struct knet_handle));
 
 	knet_h->node_id = knet_handle_cfg->node_id;
 	knet_h->sockfd = knet_handle_cfg->fd;
 
 	if (pipe(knet_h->pipefd))
 		goto exit_fail1;
 
 	if ((_fdset_cloexec(knet_h->pipefd[0])) ||
 	    (_fdset_cloexec(knet_h->pipefd[1])) ||
 	    (_fdset_nonblock(knet_h->pipefd[0])) ||
 	    (_fdset_nonblock(knet_h->pipefd[1])))
 		goto exit_fail2;
 
 	knet_h->dst_host_filter = knet_handle_cfg->dst_host_filter;
 	knet_h->dst_host_filter_fn = knet_handle_cfg->dst_host_filter_fn;
 
 	if ((knet_h->dst_host_filter) && (!knet_h->dst_host_filter_fn))
 		goto exit_fail2;
 
 	if (crypto_init(knet_h, knet_handle_cfg) < 0)
 		goto exit_fail2;
 
 	if ((knet_h->tap_to_links_buf = malloc(KNET_DATABUFSIZE))== NULL)
 		goto exit_fail3;
 
 	memset(knet_h->tap_to_links_buf, 0, KNET_DATABUFSIZE);
 
 	if ((knet_h->recv_from_links_buf = malloc(KNET_DATABUFSIZE))== NULL)
 		goto exit_fail4;
 
 	memset(knet_h->recv_from_links_buf, 0, KNET_DATABUFSIZE);
 
 	if ((knet_h->pingbuf = malloc(KNET_PINGBUFSIZE))== NULL)
 		goto exit_fail5;
 
 	memset(knet_h->pingbuf, 0, KNET_PINGBUFSIZE);
 
 	if (pthread_rwlock_init(&knet_h->list_rwlock, NULL) != 0)
 		goto exit_fail6;
 
 	knet_h->tap_to_links_epollfd = epoll_create(KNET_MAX_EVENTS);
 	knet_h->recv_from_links_epollfd = epoll_create(KNET_MAX_EVENTS);
 	knet_h->dst_link_handler_epollfd = epoll_create(KNET_MAX_EVENTS);
 
 	if ((knet_h->tap_to_links_epollfd < 0) ||
 	    (knet_h->recv_from_links_epollfd < 0) ||
 	    (knet_h->dst_link_handler_epollfd < 0))
 		goto exit_fail7;
 
 	if ((_fdset_cloexec(knet_h->tap_to_links_epollfd) != 0) ||
 	    (_fdset_cloexec(knet_h->recv_from_links_epollfd) != 0) ||
 	    (_fdset_cloexec(knet_h->dst_link_handler_epollfd) != 0))
 		goto exit_fail7;
 
 	memset(&ev, 0, sizeof(struct epoll_event));
 
 	ev.events = EPOLLIN;
 	ev.data.fd = knet_h->sockfd;
 
 	if (epoll_ctl(knet_h->tap_to_links_epollfd,
 				EPOLL_CTL_ADD, knet_h->sockfd, &ev) != 0)
 		goto exit_fail7;
 
 	memset(&ev, 0, sizeof(struct epoll_event));
 
 	ev.events = EPOLLIN;
 	ev.data.fd = knet_h->pipefd[0];
 
 	if (epoll_ctl(knet_h->dst_link_handler_epollfd,
 				EPOLL_CTL_ADD, knet_h->pipefd[0], &ev) != 0)
 		goto exit_fail7;
 
 	if (pthread_create(&knet_h->dst_link_handler_thread, 0,
 				_handle_dst_link_handler_thread, (void *) knet_h) != 0)
 		goto exit_fail7;
 
 	if (pthread_create(&knet_h->tap_to_links_thread, 0,
 				_handle_tap_to_links_thread, (void *) knet_h) != 0)
 		goto exit_fail8;
 
 	if (pthread_create(&knet_h->recv_from_links_thread, 0,
 				_handle_recv_from_links_thread, (void *) knet_h) != 0)
 		goto exit_fail9;
 
 	if (pthread_create(&knet_h->heartbt_thread, 0,
 				_handle_heartbt_thread, (void *) knet_h) != 0)
 		goto exit_fail10;
 
 	return knet_h;
 
 exit_fail10:
 	pthread_cancel(knet_h->recv_from_links_thread);
 
 exit_fail9:
 	pthread_cancel(knet_h->tap_to_links_thread);
 
 exit_fail8:
 	pthread_cancel(knet_h->dst_link_handler_thread);
 
 exit_fail7:
 	if (knet_h->tap_to_links_epollfd >= 0)
 		close(knet_h->tap_to_links_epollfd);
 	if (knet_h->recv_from_links_epollfd >= 0)
 		close(knet_h->recv_from_links_epollfd);
 	if (knet_h->dst_link_handler_epollfd >= 0)
 		close(knet_h->dst_link_handler_epollfd);
 
 	pthread_rwlock_destroy(&knet_h->list_rwlock);
 
 exit_fail6:
 	free(knet_h->pingbuf);
 
 exit_fail5:
 	free(knet_h->recv_from_links_buf);
 
 exit_fail4:
 	free(knet_h->tap_to_links_buf);
 
 exit_fail3:
 	crypto_fini(knet_h);
 
 exit_fail2:
 	close(knet_h->pipefd[0]);
 	close(knet_h->pipefd[1]);
 
 exit_fail1:
 	free(knet_h);
 	return NULL;
 }
 
 int knet_handle_free(knet_handle_t knet_h)
 {
 	void *retval;
 
 	if ((knet_h->host_head != NULL) || (knet_h->listener_head != NULL))
 		goto exit_busy;
 
 	pthread_cancel(knet_h->heartbt_thread);
 	pthread_join(knet_h->heartbt_thread, &retval);
 
 	if (retval != PTHREAD_CANCELED)
 		goto exit_busy;
 
 	pthread_cancel(knet_h->tap_to_links_thread);
 	pthread_join(knet_h->tap_to_links_thread, &retval);
 	if (retval != PTHREAD_CANCELED)
 		goto exit_busy;
 
 	pthread_cancel(knet_h->recv_from_links_thread);
 	pthread_join(knet_h->recv_from_links_thread, &retval);
 
 	if (retval != PTHREAD_CANCELED)
 		goto exit_busy;
 
 	pthread_cancel(knet_h->dst_link_handler_thread);
 	pthread_join(knet_h->dst_link_handler_thread, &retval);
 
 	if (retval != PTHREAD_CANCELED)
 		goto exit_busy;
 
 	close(knet_h->tap_to_links_epollfd);
 	close(knet_h->recv_from_links_epollfd);
 	close(knet_h->dst_link_handler_epollfd);
 	close(knet_h->pipefd[0]);
 	close(knet_h->pipefd[1]);
 
 	pthread_rwlock_destroy(&knet_h->list_rwlock);
 
 	free(knet_h->tap_to_links_buf);
 	free(knet_h->recv_from_links_buf);
 	free(knet_h->pingbuf);
 
 	crypto_fini(knet_h);
 
 	free(knet_h);
 
 	return 0;
 
  exit_busy:
 	errno = EBUSY;
 	return -EBUSY;
 }
 
 void knet_handle_setfwd(knet_handle_t knet_h, int enabled)
 {
 	knet_h->enabled = (enabled == 1) ? 1 : 0;
 }
 
 void knet_link_timeout(struct knet_link *lnk,
 				time_t interval, time_t timeout, int precision)
 {
 	lnk->ping_interval = interval * 1000; /* microseconds */
 	lnk->pong_timeout = timeout * 1000; /* microseconds */
 	lnk->latency_fix = precision;
 	lnk->latency_exp = precision - \
 				((lnk->ping_interval * precision) / 8000000);
 }
 
 static void _handle_tap_to_links(knet_handle_t knet_h)
 {
 	ssize_t inlen, len, outlen;
 	struct knet_host *dst_host;
 	int link_idx;
 	uint16_t dst_host_ids[KNET_MAX_HOST];
 	size_t dst_host_ids_entries = 0;
 	int bcast = 1;
 
 	inlen = read(knet_h->sockfd, knet_h->tap_to_links_buf->kf_data,
 					KNET_DATABUFSIZE - (KNET_FRAME_SIZE + sizeof(seq_num_t)));
 
 	if (inlen == 0) {
 		/* TODO: disconnection, should never happen! */
 		return;
 	}
 
 	len = inlen + KNET_FRAME_SIZE + sizeof(seq_num_t);
 
 	if (knet_h->enabled != 1) /* data forward is disabled */
 		return;
 
 	if (knet_h->dst_host_filter) {
 		bcast = knet_h->dst_host_filter_fn(
 				(const unsigned char *)knet_h->tap_to_links_buf->kf_data,
 				inlen,
 				knet_h->tap_to_links_buf->kf_node,
 				dst_host_ids,
 				&dst_host_ids_entries);
 		if (bcast < 0)
 			return;
 
 		if ((!bcast) && (!dst_host_ids_entries))
 			return;
 	}
 
 	if (pthread_rwlock_rdlock(&knet_h->list_rwlock) != 0)
 		return;
 
 	if (!bcast) {
 		int host_idx;
 
 		for (host_idx = 0; host_idx < dst_host_ids_entries; host_idx++) {
 			dst_host = knet_h->host_index[dst_host_ids[host_idx]];
 			if (!dst_host)
 				continue;
 
 			knet_h->tap_to_links_buf->kf_seq_num = htons(++dst_host->ucast_seq_num_tx);
 
 			if (crypto_encrypt_and_sign(knet_h->crypto_instance,
 					    (const unsigned char *)knet_h->tap_to_links_buf,
 					    len,
 					    knet_h->tap_to_links_buf_crypt,
 					    &outlen) < 0) {
 				pthread_rwlock_unlock(&knet_h->list_rwlock);
 				return;
 			}
 
 			for (link_idx = 0; link_idx < dst_host->active_link_entries; link_idx++) {
 				sendto(dst_host->link[dst_host->active_links[link_idx]].sock,
 						knet_h->tap_to_links_buf_crypt, outlen, MSG_DONTWAIT,
 						(struct sockaddr *) &dst_host->link[dst_host->active_links[link_idx]].address,
 						sizeof(struct sockaddr_storage));
-				//dst_cache_update_by_policy....
+
+				if ((dst_host->link_handler_policy == KNET_LINK_POLICY_RR) &&
+				    (dst_host->active_link_entries > 1)) {
+					uint8_t cur_link_id = dst_host->active_links[0];
+
+					memmove(&dst_host->active_links[0], &dst_host->active_links[1], (dst_host->active_link_entries - 2));
+					dst_host->active_links[dst_host->active_link_entries - 1] = cur_link_id;
+
+					break;
+				}
 			}
 		}
 	} else {
 		knet_h->tap_to_links_buf->kf_seq_num = htons(++knet_h->bcast_seq_num_tx);
 
 		if (crypto_encrypt_and_sign(knet_h->crypto_instance,
 				    (const unsigned char *)knet_h->tap_to_links_buf,
 				    len,
 				    knet_h->tap_to_links_buf_crypt,
 				    &outlen) < 0) {
 			pthread_rwlock_unlock(&knet_h->list_rwlock);
 			return;
 		}
 
 		for (dst_host = knet_h->host_head; dst_host != NULL; dst_host = dst_host->next) {
 			for (link_idx = 0; link_idx < dst_host->active_link_entries; link_idx++) {
 				sendto(dst_host->link[dst_host->active_links[link_idx]].sock,
 					knet_h->tap_to_links_buf_crypt, outlen, MSG_DONTWAIT,
 					(struct sockaddr *) &dst_host->link[dst_host->active_links[link_idx]].address,
 					sizeof(struct sockaddr_storage));
-				//dst_cache_update_by_policy....
+
+				if ((dst_host->link_handler_policy == KNET_LINK_POLICY_RR) &&
+				    (dst_host->active_link_entries > 1)) {
+					uint8_t cur_link_id = dst_host->active_links[0];
+
+					memmove(&dst_host->active_links[0], &dst_host->active_links[1], (dst_host->active_link_entries - 2));
+					dst_host->active_links[dst_host->active_link_entries - 1] = cur_link_id;
+
+					break;
+				}
 			}
 		}
 	}
 	pthread_rwlock_unlock(&knet_h->list_rwlock);
 }
 
 static void _handle_recv_from_links(knet_handle_t knet_h, int sockfd)
 {
 	ssize_t len, outlen;
 	struct sockaddr_storage address;
 	socklen_t addrlen;
 	struct knet_host *src_host;
 	struct knet_link *src_link;
 	unsigned long long latency_last;
 	uint16_t dst_host_ids[KNET_MAX_HOST];
 	size_t dst_host_ids_entries = 0;
 	int bcast = 1;
 
 	if (pthread_rwlock_rdlock(&knet_h->list_rwlock) != 0)
 		return;
 
 	addrlen = sizeof(struct sockaddr_storage);
 	len = recvfrom(sockfd, knet_h->recv_from_links_buf, KNET_DATABUFSIZE,
 		MSG_DONTWAIT, (struct sockaddr *) &address, &addrlen);
 
 	if (crypto_authenticate_and_decrypt(knet_h->crypto_instance,
 					    (unsigned char *)knet_h->recv_from_links_buf,
 					    &len) < 0)
 		goto exit_unlock;
 
 	if (len < (KNET_FRAME_SIZE + 1))
 		goto exit_unlock;
 
 	if (ntohl(knet_h->recv_from_links_buf->kf_magic) != KNET_FRAME_MAGIC)
 		goto exit_unlock;
 
 	if (knet_h->recv_from_links_buf->kf_version != KNET_FRAME_VERSION)
 		goto exit_unlock;
 
 	knet_h->recv_from_links_buf->kf_node = ntohs(knet_h->recv_from_links_buf->kf_node);
 	src_host = knet_h->host_index[knet_h->recv_from_links_buf->kf_node];
 	if (src_host == NULL) {  /* host not found */
 		goto exit_unlock;
 	}
 
 	src_link = NULL;
 
 	if ((knet_h->recv_from_links_buf->kf_type & KNET_FRAME_PMSK) != 0) {
 		src_link = src_host->link +
 				(knet_h->recv_from_links_buf->kf_link % KNET_MAX_LINK);
 	}
 
 	switch (knet_h->recv_from_links_buf->kf_type) {
 	case KNET_FRAME_DATA:
 		if (knet_h->enabled != 1) /* data forward is disabled */
 			break;
 
 		knet_h->recv_from_links_buf->kf_seq_num = ntohs(knet_h->recv_from_links_buf->kf_seq_num);
 
 		if (knet_h->dst_host_filter) {
 			int host_idx;
 			int found = 0;
 
 			bcast = knet_h->dst_host_filter_fn(
 					(const unsigned char *)knet_h->recv_from_links_buf->kf_data,
 					len,
 					knet_h->recv_from_links_buf->kf_node,
 					dst_host_ids,
 					&dst_host_ids_entries);
 			if (bcast < 0)
 				goto exit_unlock;
 
 			if ((!bcast) && (!dst_host_ids_entries))
 				goto exit_unlock;
 
 			/* check if we are dst for this packet */
 			if (!bcast) {
 				for (host_idx = 0; host_idx < dst_host_ids_entries; host_idx++) {
 					if (dst_host_ids[host_idx] == knet_h->node_id) {
 						found = 1;
 						break;
 					}
 				}
 				if (!found)
 					goto exit_unlock;
 			}
 		}
 
 		if (!knet_should_deliver(src_host, bcast, knet_h->recv_from_links_buf->kf_seq_num))
 			goto exit_unlock;
 
 		if (write(knet_h->sockfd,
 			  knet_h->recv_from_links_buf->kf_data,
 			  len - (KNET_FRAME_SIZE + sizeof(seq_num_t))) == len - (KNET_FRAME_SIZE + sizeof(seq_num_t)))
 			knet_has_been_delivered(src_host, bcast, knet_h->recv_from_links_buf->kf_seq_num);
 
 		break;
 	case KNET_FRAME_PING:
 		knet_h->recv_from_links_buf->kf_type = KNET_FRAME_PONG;
 		knet_h->recv_from_links_buf->kf_node = htons(knet_h->node_id);
 
 		if (crypto_encrypt_and_sign(knet_h->crypto_instance,
 					    (const unsigned char *)knet_h->recv_from_links_buf,
 					    len,
 					    knet_h->recv_from_links_buf_crypt,
 					    &outlen) < 0)
 			break;
 
 		sendto(src_link->sock, knet_h->recv_from_links_buf_crypt, outlen, MSG_DONTWAIT,
 				(struct sockaddr *) &src_link->address,
 				sizeof(struct sockaddr_storage));
 
 		break;
 	case KNET_FRAME_PONG:
 		clock_gettime(CLOCK_MONOTONIC, &src_link->pong_last);
 
 		timespec_diff(knet_h->recv_from_links_buf->kf_time,
 				src_link->pong_last, &latency_last);
 
 		src_link->latency =
 			((src_link->latency * src_link->latency_exp) +
 			((latency_last / 1000llu) *
 				(src_link->latency_fix - src_link->latency_exp))) /
 					src_link->latency_fix;
 
 		if (src_link->latency < src_link->pong_timeout) {
 			if (!src_link->connected) {
 				int write_retry = 0;
 
 				src_link->connected = 1;
 try_again:
 				if (write(knet_h->pipefd[1], &src_host->node_id,
 					  sizeof(src_host->node_id)) != sizeof(src_host->node_id)) {
 					if ((write_retry < 10) && ((errno = EAGAIN) || (errno = EWOULDBLOCK))) {
 						write_retry++;
 						goto try_again;
 					} /* define what to do if we can't add a link */
 				}
 			}
 		}
 
 		break;
 	default:
 		goto exit_unlock;
 	}
 
  exit_unlock:
 	pthread_rwlock_unlock(&knet_h->list_rwlock);
 }
 
 static void _handle_dst_link_updates(knet_handle_t knet_h)
 {
 	uint16_t dst_host_id;
 	struct knet_host *dst_host;
 	int link_idx;
 	int best_priority = -1;
 
 	if (read(knet_h->pipefd[0], &dst_host_id, sizeof(dst_host_id)) != sizeof(dst_host_id))
 		return;
 
 	if (pthread_rwlock_wrlock(&knet_h->list_rwlock) != 0)
 		return;
 
 	dst_host = knet_h->host_index[dst_host_id];
 	if (!dst_host)
 		goto out_unlock;
 
 	dst_host->active_link_entries = 0;
 
 	for (link_idx = 0; link_idx < KNET_MAX_LINK; link_idx++) {
 		if (dst_host->link[link_idx].configured != 1) /* link is not configured */
 			continue;
 		if (dst_host->link[link_idx].connected != 1) /* link is not enabled */
 			continue;
 
 		if (dst_host->link_handler_policy == KNET_LINK_POLICY_PASSIVE) {
 			/* for passive we look for the only active link with higher priority */
 			if (dst_host->link[link_idx].priority > best_priority) {
 				dst_host->active_links[0] = link_idx;
 				best_priority = dst_host->link[link_idx].priority;
 			}
 			dst_host->active_link_entries = 1;
 		} else {
 			/* for RR and ACTIVE we need to copy all available links */
 			dst_host->active_links[dst_host->active_link_entries] = link_idx;
 			dst_host->active_link_entries++;
 		}
 	}
 
 	/* no active links, we can clean the circular buffers and indexes */
 	if (!dst_host->active_link_entries) {
 		memset(dst_host->bcast_circular_buffer, 0, KNET_CBUFFER_SIZE);
 		memset(dst_host->ucast_circular_buffer, 0, KNET_CBUFFER_SIZE);
 		dst_host->bcast_seq_num_rx = 0;
 		dst_host->ucast_seq_num_rx = 0;
 	}
 
 out_unlock:
 	pthread_rwlock_unlock(&knet_h->list_rwlock);
 
 	return;
 }
 
 static void _handle_check_each(knet_handle_t knet_h, struct knet_host *dst_host, struct knet_link *dst_link)
 {
 	int len;
 	ssize_t outlen;
 	struct timespec clock_now, pong_last;
 	unsigned long long diff_ping;
 
 	/* caching last pong to avoid race conditions */
 	pong_last = dst_link->pong_last;
 
 	if (clock_gettime(CLOCK_MONOTONIC, &clock_now) != 0)
 		return;
 
 	timespec_diff(dst_link->ping_last, clock_now, &diff_ping);
 
 	if (diff_ping >= (dst_link->ping_interval * 1000llu)) {
 		knet_h->pingbuf->kf_time = clock_now;
 		knet_h->pingbuf->kf_link = dst_link->link_id;
 
 		if (crypto_encrypt_and_sign(knet_h->crypto_instance,
 					    (const unsigned char *)knet_h->pingbuf,
 					    KNET_PINGBUFSIZE,
 					    knet_h->pingbuf_crypt,
 					    &outlen) < 0)
 		return;
 
 		len = sendto(dst_link->sock, knet_h->pingbuf_crypt, outlen,
 			MSG_DONTWAIT, (struct sockaddr *) &dst_link->address,
 			sizeof(struct sockaddr_storage));
 
 		if (len == outlen)
 			dst_link->ping_last = clock_now;
 	}
 
 	if (dst_link->connected == 1) {
 		timespec_diff(pong_last, clock_now, &diff_ping);
 
 		if (diff_ping >= (dst_link->pong_timeout * 1000llu)) {
 			int write_retry = 0;
 
 			dst_link->connected = 0;
 try_again:
 			if (write(knet_h->pipefd[1], &dst_host->node_id, sizeof(dst_host->node_id)) != sizeof(dst_host->node_id)) {
 				if ((write_retry < 10) && ((errno = EAGAIN) || (errno = EWOULDBLOCK))) {
 					write_retry++;
 					goto try_again;
 				} /* define what to do if we can't deactivate a link */
 			} 
 		}
 	}
 }
 
 static void *_handle_heartbt_thread(void *data)
 {
 	knet_handle_t knet_h;
 	struct knet_host *dst_host;
 	int link_idx;
 
 	knet_h = (knet_handle_t) data;
 
 	/* preparing ping buffer */
 	knet_h->pingbuf->kf_magic = htonl(KNET_FRAME_MAGIC);
 	knet_h->pingbuf->kf_version = KNET_FRAME_VERSION;
 	knet_h->pingbuf->kf_type = KNET_FRAME_PING;
 	knet_h->pingbuf->kf_node = htons(knet_h->node_id);
 
 	while (1) {
 		usleep(KNET_PING_TIMERES);
 
 		if (pthread_rwlock_rdlock(&knet_h->list_rwlock) != 0)
 			continue;
 
 		for (dst_host = knet_h->host_head; dst_host != NULL; dst_host = dst_host->next) {
 			for (link_idx = 0; link_idx < KNET_MAX_LINK; link_idx++) {
 				if (dst_host->link[link_idx].configured != 1)
 					continue;
 				_handle_check_each(knet_h, dst_host, &dst_host->link[link_idx]);
 			}
 		}
 
 		pthread_rwlock_unlock(&knet_h->list_rwlock);
 	}
 
 	return NULL;
 }
 
 static void *_handle_tap_to_links_thread(void *data)
 {
 	knet_handle_t knet_h;
 	struct epoll_event events[KNET_MAX_EVENTS];
 
 	knet_h = (knet_handle_t) data;
 
 	/* preparing data buffer */
 	knet_h->tap_to_links_buf->kf_magic = htonl(KNET_FRAME_MAGIC);
 	knet_h->tap_to_links_buf->kf_version = KNET_FRAME_VERSION;
 	knet_h->tap_to_links_buf->kf_type = KNET_FRAME_DATA;
 	knet_h->tap_to_links_buf->kf_node = htons(knet_h->node_id);
 
 	while (1) {
 		if (epoll_wait(knet_h->tap_to_links_epollfd, events, KNET_MAX_EVENTS, -1) >= 1)
 			_handle_tap_to_links(knet_h);
 	}
 
 	return NULL;
 
 }
 
 static void *_handle_recv_from_links_thread(void *data)
 {
 	int i, nev;
 	knet_handle_t knet_h = (knet_handle_t) data;
 	struct epoll_event events[KNET_MAX_EVENTS];
 
 	while (1) {
 		nev = epoll_wait(knet_h->recv_from_links_epollfd, events, KNET_MAX_EVENTS, -1);
 
 		for (i = 0; i < nev; i++) {
 			_handle_recv_from_links(knet_h, events[i].data.fd);
 		}
 	}
 
 	return NULL;
 }
 
 static void *_handle_dst_link_handler_thread(void *data)
 {
 	knet_handle_t knet_h = (knet_handle_t) data;
 	struct epoll_event events[KNET_MAX_EVENTS];
 
 	while (1) {
 		if (epoll_wait(knet_h->dst_link_handler_epollfd, events, KNET_MAX_EVENTS, -1) >= 1)
 			_handle_dst_link_updates(knet_h);
 	}
 
 	return NULL;	
 }