diff --git a/libi2pd/Profiling.cpp b/libi2pd/Profiling.cpp
index 24b99833..6dcdabec 100644
--- a/libi2pd/Profiling.cpp
+++ b/libi2pd/Profiling.cpp
@@ -36,7 +36,8 @@ namespace data
 		m_LastUpdateTime (GetTime ()), m_IsUpdated (false),
 		m_LastDeclineTime (0), m_LastUnreachableTime (0),
 		m_NumTunnelsAgreed (0), m_NumTunnelsDeclined (0), m_NumTunnelsNonReplied (0),
-		m_NumTimesTaken (0), m_NumTimesRejected (0), m_HasConnected (false)
+		m_NumTimesTaken (0), m_NumTimesRejected (0), m_HasConnected (false),
+		m_IsDuplicated (false)
 	{
 	}
 
@@ -57,6 +58,8 @@ namespace data
 		usage.put (PEER_PROFILE_USAGE_TAKEN, m_NumTimesTaken);
 		usage.put (PEER_PROFILE_USAGE_REJECTED, m_NumTimesRejected);
 		usage.put (PEER_PROFILE_USAGE_CONNECTED, m_HasConnected);
+		if (m_IsDuplicated)
+			usage.put (PEER_PROFILE_USAGE_DUPLICATED, true);
 		// fill property tree
 		boost::property_tree::ptree pt;
 		pt.put (PEER_PROFILE_LAST_UPDATE_TIME, boost::posix_time::to_simple_string (m_LastUpdateTime));
@@ -126,6 +129,7 @@ namespace data
 					m_NumTimesTaken = usage.get (PEER_PROFILE_USAGE_TAKEN, 0);
 					m_NumTimesRejected = usage.get (PEER_PROFILE_USAGE_REJECTED, 0);
 					m_HasConnected = usage.get (PEER_PROFILE_USAGE_CONNECTED, false);
+					m_IsDuplicated = usage.get (PEER_PROFILE_USAGE_DUPLICATED, false);
 				}
 				catch (boost::property_tree::ptree_bad_path& ex)
 				{
@@ -178,6 +182,11 @@ namespace data
 		UpdateTime ();
 	}
 
+	void RouterProfile::Duplicated ()
+	{
+		m_IsDuplicated = true;
+	}	
+		
 	bool RouterProfile::IsLowPartcipationRate () const
 	{
 		return 4*m_NumTunnelsAgreed < m_NumTunnelsDeclined; // < 20% rate
@@ -201,7 +210,7 @@ namespace data
 
 	bool RouterProfile::IsBad ()
 	{
-		if (IsDeclinedRecently () || IsUnreachable ()) return true;
+		if (IsDeclinedRecently () || IsUnreachable () || m_IsDuplicated) return true;
 		auto isBad = IsAlwaysDeclining () || IsLowPartcipationRate () /*|| IsLowReplyRate ()*/;
 		if (isBad && m_NumTimesRejected > 10*(m_NumTimesTaken + 1))
 		{
diff --git a/libi2pd/Profiling.h b/libi2pd/Profiling.h
index f4c4a4da..2bae61d4 100644
--- a/libi2pd/Profiling.h
+++ b/libi2pd/Profiling.h
@@ -30,6 +30,7 @@ namespace data
 	const char PEER_PROFILE_USAGE_TAKEN[] = "taken";
 	const char PEER_PROFILE_USAGE_REJECTED[] = "rejected";
 	const char PEER_PROFILE_USAGE_CONNECTED[] = "connected";
+	const char PEER_PROFILE_USAGE_DUPLICATED[] = "duplicated";
 	
 	const int PEER_PROFILE_EXPIRATION_TIMEOUT = 36; // in hours (1.5 days)
 	const int PEER_PROFILE_AUTOCLEAN_TIMEOUT = 1500; // in seconds (25 minutes)
@@ -59,6 +60,7 @@ namespace data
 
 			void Unreachable (bool unreachable);
 			void Connected ();
+			void Duplicated ();
 
 			boost::posix_time::ptime GetLastUpdateTime () const { return m_LastUpdateTime; };
 			bool IsUpdated () const { return m_IsUpdated; };
@@ -87,6 +89,7 @@ namespace data
 			uint32_t m_NumTimesTaken;
 			uint32_t m_NumTimesRejected;
 			bool m_HasConnected; // successful trusted(incoming or NTCP2) connection 
+			bool m_IsDuplicated;
 	};
 
 	std::shared_ptr<RouterProfile> GetRouterProfile (const IdentHash& identHash);
diff --git a/libi2pd/SSU2Session.cpp b/libi2pd/SSU2Session.cpp
index bb82135f..b0338666 100644
--- a/libi2pd/SSU2Session.cpp
+++ b/libi2pd/SSU2Session.cpp
@@ -1132,7 +1132,14 @@ namespace transport
 			LogPrint (eLogError, "SSU2: Couldn't update RouterInfo from SessionConfirmed in netdb");
 			return false;
 		}
-		if (ri->GetTimestamp () >= ri1->GetTimestamp ()) ri = ri1; // received RouterInfo is not older than one in netdb
+		if (ri->GetTimestamp () + i2p::data::NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL >= ri1->GetTimestamp ()) 
+			ri = ri1; // received RouterInfo is not older than one in netdb
+		else
+		{
+			// othewise we assume duplicate
+			auto profile = i2p::data::GetRouterProfile (ri->GetIdentHash ());
+			if (profile) profile->Duplicated (); // mark router as duplicated in profile	
+		}	
 		
 		m_Address = m_RemoteEndpoint.address ().is_v6 () ? ri->GetSSU2V6Address () : ri->GetSSU2V4Address ();
 		if (!m_Address || memcmp (S, m_Address->s, 32))