diff --git a/src/config_parser.c b/src/config_parser.c
index 496070b1..6cc21451 100644
--- a/src/config_parser.c
+++ b/src/config_parser.c
@@ -986,9 +986,9 @@ void print_config(const struct utun_config *cfg) {
     DEBUG_INFO(DEBUG_CATEGORY_CONFIG, "Servers:");
     struct CFG_SERVER *s = cfg->servers;
     while (s) {
-        struct sockaddr_in *sin = (struct sockaddr_in *)&s->ip;
-        DEBUG_INFO(DEBUG_CATEGORY_CONFIG, "  %s: %s:%d (mark=%d, netif=%u, type=%u, mtu=%d)",
-                   s->name, ip_to_str(&sin->sin_addr, AF_INET).str, ntohs(sin->sin_port),
+        ip_str_t addr_str = sockaddr_storage_to_str(&s->ip);
+        DEBUG_INFO(DEBUG_CATEGORY_CONFIG, "  %s: %s (mark=%d, netif=%u, type=%u, mtu=%d)",
+                   s->name, addr_str.str,
                    s->so_mark, s->netif_index, s->type, s->mtu);
         s = s->next;
     }
@@ -999,9 +999,9 @@ void print_config(const struct utun_config *cfg) {
         DEBUG_INFO(DEBUG_CATEGORY_CONFIG, "  %s: peer_key=%s, keepalive=%d", c->name, c->peer_public_key_hex, c->keepalive);
         struct CFG_CLIENT_LINK *link = c->links;
         while (link) {
-            struct sockaddr_in *sin = (struct sockaddr_in *)&link->remote_addr;
-            DEBUG_INFO(DEBUG_CATEGORY_CONFIG, "    Link: %s:%d (via %s)",
-                       ip_to_str(&sin->sin_addr, AF_INET).str, ntohs(sin->sin_port), link->local_srv->name);
+            ip_str_t addr_str = sockaddr_storage_to_str(&link->remote_addr);
+            DEBUG_INFO(DEBUG_CATEGORY_CONFIG, "    Link: %s (via %s)",
+                       addr_str.str, link->local_srv->name);
             link = link->next;
         }
         c = c->next;
diff --git a/src/etcp.c b/src/etcp.c
index 210a56a6..0bb62154 100644
--- a/src/etcp.c
+++ b/src/etcp.c
@@ -1239,7 +1239,6 @@ void etcp_ack_recv(struct ETCP_CONN* etcp, uint32_t seq, uint16_t ts, uint16_t d
             uint32_t new_pacing = link->bbr_pacing_rate;
             bbr_main(link->bbr, &rs, &new_cwnd, &new_pacing, link->mtu, link->inflight_bytes,
                      (link->inflight_bytes >= link->inflight_lim_bytes));
-            link->inflight_lim_bytes = new_cwnd;
             link->bbr_pacing_rate    = new_pacing;
             link->bandwidth          = (uint32_t)((uint64_t)new_pacing * 8 / 1000);
 
@@ -1278,10 +1277,6 @@ void etcp_ack_recv(struct ETCP_CONN* etcp, uint32_t seq, uint16_t ts, uint16_t d
 void etcp_conn_input(struct ETCP_DGRAM* pkt) {
     DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "");
     if (!pkt) return;
-    if (memory_pool_is_freed(pkt->link->etcp->instance->pkt_pool, pkt)) {
-        DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_conn_input: pkt=%p ALREADY FREED in pkt_pool — HALTING", (void*)pkt);
-        volatile int _halt = 1; while (_halt) {}
-    }
     if (!pkt->data_len) {
         memory_pool_free(pkt->link->etcp->instance->pkt_pool, pkt);
         return;
@@ -1549,12 +1544,6 @@ void etcp_conn_input(struct ETCP_DGRAM* pkt) {
 
     }
 
-    if (memory_pool_is_freed(pkt->link->etcp->instance->pkt_pool, pkt)) {
-        DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_conn_input: pkt=%p ALREADY FREED in pkt_pool — HALTING", (void*)pkt);
-        volatile int _halt = 1; while (_halt) {}
-    }
-
-
     memory_pool_free(etcp->instance->pkt_pool, pkt);  // Free the incoming dgram
 }
 
diff --git a/src/etcp_bbr.c b/src/etcp_bbr.c
index 4a332c58..fda3d573 100644
--- a/src/etcp_bbr.c
+++ b/src/etcp_bbr.c
@@ -862,6 +862,8 @@ void bbr_init(struct bbr* bbr)
     bbr->rounds_since_probe = 0;
     bbr->bw_probe_samples = 0;
     bbr->prev_probe_too_high = 0;
+    bbr->on_cwnd_update = NULL;
+    bbr->cwnd_update_ctx = NULL;
 }
 
 void bbr_main(struct bbr* bbr, const struct bbr_rate_sample* rs,
@@ -906,6 +908,7 @@ void bbr_main(struct bbr* bbr, const struct bbr_rate_sample* rs,
 out:
     bbr_advance_latest_delivery_signals(bbr, rs, sample_bw);
     bbr->loss_in_cycle |= (rs->lost > 0);
+    if (bbr->on_cwnd_update) bbr->on_cwnd_update(bbr->cwnd_update_ctx, cwnd);
     *cwnd_out = cwnd;
 }
 
diff --git a/src/etcp_bbr.h b/src/etcp_bbr.h
index c703a4a3..784fcfc0 100644
--- a/src/etcp_bbr.h
+++ b/src/etcp_bbr.h
@@ -45,6 +45,8 @@ struct bbr_rate_sample {
     int      is_app_limited;
 };
 
+typedef void (*bbr_cwnd_update_fn)(void* ctx, uint32_t new_cwnd);
+
 struct bbr {
     uint32_t min_rtt_us;
     uint32_t bw_lo;
@@ -97,6 +99,8 @@ struct bbr {
     uint8_t  full_bw_now      : 1;
     uint8_t  pad_unused       : 6;
     uint64_t now_tb;               // 0 = real get_time_tb(); >0 = test-controlled time
+    bbr_cwnd_update_fn on_cwnd_update;
+    void* cwnd_update_ctx;
 };
 
 void bbr_init(struct bbr* bbr);
diff --git a/src/etcp_connections.c b/src/etcp_connections.c
index 0b8be32a..c1d02c17 100644
--- a/src/etcp_connections.c
+++ b/src/etcp_connections.c
@@ -746,6 +746,8 @@ void etcp_socket_remove(struct ETCP_SOCKET* conn) {
 }
 
 
+static void bbr_cwnd_updated(void* ctx, uint32_t new_cwnd);
+
 struct ETCP_LINK* etcp_link_new(struct ETCP_CONN* etcp, struct ETCP_SOCKET* conn, struct sockaddr_storage* remote_addr, uint8_t is_server) {
     DEBUG_TRACE(DEBUG_CATEGORY_CONNECTION, "");
     if (!remote_addr) return NULL;
@@ -787,7 +789,6 @@ struct ETCP_LINK* etcp_link_new(struct ETCP_CONN* etcp, struct ETCP_SOCKET* conn
     link->keepalive_sent_count = 0;
     link->keepalive_recv_count = 0;
     link->ka_period_ms = KA_PERIOD_MIN_MS;
-    link->inflight_lim_bytes = link->mtu * 4;     // BBR init_cwnd (~4 packets)
     link->bandwidth = 10000;                       // начальная оценка 10 Mbps для шейпера
     link->burst_id = 0;
     link->burst_active = 0;
@@ -832,10 +833,9 @@ struct ETCP_LINK* etcp_link_new(struct ETCP_CONN* etcp, struct ETCP_SOCKET* conn
     while (l && l->next) l=l->next;
     if (l) l->next = link; else etcp->links = link;
 
-// пересчитать connection-level optimal_inflight
-    {   uint32_t sum = 0;
-        for (struct ETCP_LINK* tl = etcp->links; tl; tl = tl->next) sum += tl->inflight_lim_bytes;
-        etcp->optimal_inflight = sum; }
+    etcp_link_update_inflight_lim(link, link->mtu * 4);
+    link->bbr->on_cwnd_update = bbr_cwnd_updated;
+    link->bbr->cwnd_update_ctx = link;
 
     DEBUG_INFO(DEBUG_CATEGORY_CONNECTION, "NEW link initialized on etcp=[%s] link=%p socket=%s id=%d is_server=%d mtu=%d", etcp->log_name, link, conn->name, link->local_link_id, link->is_server, link->mtu);
 
@@ -847,6 +847,18 @@ struct ETCP_LINK* etcp_link_new(struct ETCP_CONN* etcp, struct ETCP_SOCKET* conn
     return link;
 }
 
+static void bbr_cwnd_updated(void* ctx, uint32_t new_cwnd) {
+    etcp_link_update_inflight_lim((struct ETCP_LINK*)ctx, new_cwnd);
+}
+
+void etcp_link_update_inflight_lim(struct ETCP_LINK* link, uint32_t new_lim) {
+    link->inflight_lim_bytes = new_lim;
+    struct ETCP_CONN* etcp = link->etcp;
+    uint32_t sum = 0;
+    for (struct ETCP_LINK* tl = etcp->links; tl; tl = tl->next) sum += tl->inflight_lim_bytes;
+    etcp->optimal_inflight = sum;
+}
+
 void etcp_link_close(struct ETCP_LINK* link) {
     DEBUG_TRACE(DEBUG_CATEGORY_CONNECTION, "");
     if (!link) return;
@@ -1731,10 +1743,6 @@ process_decrypted:
 //    log_dump("RECV decrypted:", pkt->data, pkt->data_len, link);
 
     if (link->link_state == 3) {
-        if (memory_pool_is_freed(e_sock->instance->pkt_pool, pkt)) {
-            DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_conn_input: pkt=%p ALREADY FREED in pkt_pool — HALTING", (void*)pkt);
-            volatile int _halt = 1; while (_halt) {}
-        }
         etcp_conn_input(pkt);
     } else memory_pool_free(e_sock->instance->pkt_pool, pkt);
     return;
diff --git a/src/etcp_connections.h b/src/etcp_connections.h
index 4bb68cf6..98943c1e 100644
--- a/src/etcp_connections.h
+++ b/src/etcp_connections.h
@@ -262,6 +262,7 @@ void etcp_socket_remove(struct ETCP_SOCKET* conn);
 // connection functions
 // создает новый канал связи для etcp подключения (ETCP_CONN)
 struct ETCP_LINK* etcp_link_new(struct ETCP_CONN* etcp, struct ETCP_SOCKET* conn, struct sockaddr_storage* remote_addr, uint8_t is_server);
+void etcp_link_update_inflight_lim(struct ETCP_LINK* link, uint32_t new_lim);
 void etcp_link_close(struct ETCP_LINK* link);
 //int etcp_input_cbk(struct packet_buffer* pkt, struct ETCP_SOCKET* conn);// получает расшифрованный пакет
 int etcp_encrypt_send(struct ETCP_DGRAM* dgram);// зашифровывает и отправляет пакет
diff --git a/src/utun_instance.c b/src/utun_instance.c
index c16bb59e..251cf054 100644
--- a/src/utun_instance.c
+++ b/src/utun_instance.c
@@ -49,7 +49,12 @@ static int local_sockaddr_equal(const struct sockaddr_storage *a, const struct s
         const struct sockaddr_in *ib = (const struct sockaddr_in *)b;
         return ia->sin_addr.s_addr == ib->sin_addr.s_addr && ia->sin_port == ib->sin_port;
     }
-    return 0;  // IPv6 stub
+    if (a->ss_family == AF_INET6) {
+        const struct sockaddr_in6 *ia = (const struct sockaddr_in6 *)a;
+        const struct sockaddr_in6 *ib = (const struct sockaddr_in6 *)b;
+        return memcmp(&ia->sin6_addr, &ib->sin6_addr, 16) == 0 && ia->sin6_port == ib->sin6_port;
+    }
+    return 0;
 }
 
 // Common initialization function (called by both create functions)