diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index a8a269c..c4c862b 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -1417,12 +1417,6 @@
       << IsCurrentPacketConnectivityProbing();
 
   if (IsCurrentPacketConnectivityProbing()) {
-    QUIC_DVLOG(1) << ENDPOINT << "Received a connectivity probing packet for "
-                  << GetServerConnectionIdAsRecipient(last_header_,
-                                                      perspective_)
-                  << " from ip:port: " << last_packet_source_address_.ToString()
-                  << " to ip:port: "
-                  << last_packet_destination_address_.ToString();
     visitor_->OnPacketReceived(last_packet_destination_address_,
                                last_packet_source_address_,
                                /*is_connectivity_probe=*/true);
@@ -3711,10 +3705,23 @@
     if (perspective_ == Perspective::IS_SERVER) {
       is_current_packet_connectivity_probing_ =
           current_effective_peer_migration_type_ != NO_CHANGE;
+      QUIC_DLOG_IF(INFO, is_current_packet_connectivity_probing_)
+          << ENDPOINT
+          << "Detected connectivity probing packet. "
+             "current_effective_peer_migration_type_:"
+          << current_effective_peer_migration_type_;
     } else {
       is_current_packet_connectivity_probing_ =
           (last_packet_source_address_ != peer_address_) ||
           (last_packet_destination_address_ != self_address_);
+      QUIC_DLOG_IF(INFO, is_current_packet_connectivity_probing_)
+          << ENDPOINT
+          << "Detected connectivity probing packet. "
+             "last_packet_source_address_:"
+          << last_packet_source_address_ << ", peer_address_:" << peer_address_
+          << ", last_packet_destination_address_:"
+          << last_packet_destination_address_
+          << ", self_address_:" << self_address_;
     }
     return;
   }
diff --git a/quic/core/quic_types.cc b/quic/core/quic_types.cc
index c0bdf1e..0fa7cfb 100644
--- a/quic/core/quic_types.cc
+++ b/quic/core/quic_types.cc
@@ -632,9 +632,30 @@
       break;
   }
 }
+
 std::ostream& operator<<(std::ostream& os, const QuicConnectionCloseType type) {
   os << QuicConnectionCloseTypeString(type);
   return os;
 }
 
+std::string AddressChangeTypeToString(AddressChangeType type) {
+  using IntType = typename std::underlying_type<AddressChangeType>::type;
+  switch (type) {
+    RETURN_STRING_LITERAL(NO_CHANGE);
+    RETURN_STRING_LITERAL(PORT_CHANGE);
+    RETURN_STRING_LITERAL(IPV4_SUBNET_CHANGE);
+    RETURN_STRING_LITERAL(IPV4_TO_IPV4_CHANGE);
+    RETURN_STRING_LITERAL(IPV4_TO_IPV6_CHANGE);
+    RETURN_STRING_LITERAL(IPV6_TO_IPV4_CHANGE);
+    RETURN_STRING_LITERAL(IPV6_TO_IPV6_CHANGE);
+    default:
+      return quiche::QuicheStrCat("Unknown(", static_cast<IntType>(type), ")");
+  }
+}
+
+std::ostream& operator<<(std::ostream& os, AddressChangeType type) {
+  os << AddressChangeTypeToString(type);
+  return os;
+}
+
 }  // namespace quic
diff --git a/quic/core/quic_types.h b/quic/core/quic_types.h
index e027b7b..2c2c2d0 100644
--- a/quic/core/quic_types.h
+++ b/quic/core/quic_types.h
@@ -460,6 +460,12 @@
   IPV6_TO_IPV6_CHANGE,
 };
 
+QUIC_EXPORT_PRIVATE std::string AddressChangeTypeToString(
+    AddressChangeType type);
+
+QUIC_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
+                                             AddressChangeType type);
+
 enum StreamSendingState {
   // Sender has more data to send on this stream.
   NO_FIN,