diff --git a/.gitignore b/.gitignore
index a30adb7..ded733d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 build/
 prompt.txt
 docs/clang-doc/
+**/tmp*
+**/tmp/
diff --git a/src/hosts/publisher.cc b/src/hosts/publisher.cc
index 7b862fa..b9e78e1 100644
--- a/src/hosts/publisher.cc
+++ b/src/hosts/publisher.cc
@@ -26,8 +26,7 @@ void Publisher::set_status(NodeStatus s, Time new_latency) noexcept {
 
         // Forward to Node base if available (Host derives from Node).
         // If Node::set_status is public, this works; otherwise adjust when you expose it.
-        // (We keep this call for correctness; remove if not yet available.)
-        // Node::set_status(s);
+        Node::set_status(s);
 
         if (s == NodeStatus::DOWN) {
                 if (_staging_evt != NULL_EVENT) {
diff --git a/src/hosts/subscriber.cc b/src/hosts/subscriber.cc
index 92e2d86..594f96e 100644
--- a/src/hosts/subscriber.cc
+++ b/src/hosts/subscriber.cc
@@ -23,7 +23,8 @@ Subscriber::Subscriber(Simulator* sim,
 }
 
 void Subscriber::set_status(NodeStatus s) noexcept {
-        // Node::set_status(s);
+        Node::set_status(s);
+
         if (s == NodeStatus::DOWN) {
                 if (_hb_evt != NULL_EVENT) {
                         _sim->cancel(_hb_evt);
diff --git a/src/network/network_nic.cc b/src/network/network_nic.cc
index 6910b56..14013e2 100644
--- a/src/network/network_nic.cc
+++ b/src/network/network_nic.cc
@@ -179,6 +179,13 @@ void NetworkNic::recv_pkt(Packet &pkt_in, PortId ingress) {
                 Time rtt;
 
                 if (lookup_rtt_and_erase(pkt, now, rtt)) {
+                        auto &out = _tx_outstanding[pkt.flow_id()];
+
+                        if (out >= DEFAULT_MSS_BYTES)
+                                out -= DEFAULT_MSS_BYTES;
+                        else
+                                out = Bytes(0);
+
                         if (_cc) {
                                 _cc->update(pkt, rtt);
                                 _telemetry.cc_updates++;
@@ -388,6 +395,7 @@ void NetworkNic::schedule_ack(const Packet& rx_data, PortId ingress) noexcept {
         [this, ack, egress]() mutable {
                 enqueue_packet(egress, QClass::CONTROL, ack);
         });
+
         _telemetry.tx_acks++;
 }
 
@@ -602,6 +610,7 @@ bool NetworkNic::try_send_one(PortId port, QClass cls) noexcept {
                         if (pkt.protocol() == PacketProtocol::DATA) {
                                 record_tx_timestamp(pkt);
                         }
+                        if (!_buf) return;
                         (void)_buf->enqueue_packet(pkt, port, pkt.priority());
                 });
         }