diff --git a/NetDb.cpp b/NetDb.cpp
index d0b6da26..b9d5a130 100644
--- a/NetDb.cpp
+++ b/NetDb.cpp
@@ -168,16 +168,19 @@ namespace data
 		}	
 		else	
 		{	
-			LogPrint (eLogInfo, "NetDb: RouterInfo added: ", ident.ToBase32());
 			r = std::make_shared<RouterInfo> (buf, len);
+			if (!r->IsUnreachable ())
 			{
-				std::unique_lock<std::mutex> l(m_RouterInfosMutex);
-				m_RouterInfos[r->GetIdentHash ()] = r;
-			}
-			if (r->IsFloodfill ())
-			{
-				std::unique_lock<std::mutex> l(m_FloodfillsMutex);
-				m_Floodfills.push_back (r);
+				LogPrint (eLogInfo, "NetDb: RouterInfo added: ", ident.ToBase32());
+				{
+					std::unique_lock<std::mutex> l(m_RouterInfosMutex);
+					m_RouterInfos[r->GetIdentHash ()] = r;
+				}
+				if (r->IsFloodfill ())
+				{
+					std::unique_lock<std::mutex> l(m_FloodfillsMutex);
+					m_Floodfills.push_back (r);
+				}
 			}	
 		}	
 		// take care about requested destination
diff --git a/RouterContext.cpp b/RouterContext.cpp
index 3117c85a..7d35ccf1 100644
--- a/RouterContext.cpp
+++ b/RouterContext.cpp
@@ -51,7 +51,7 @@ namespace i2p
 		routerInfo.SetCaps (i2p::data::RouterInfo::eReachable | 
 			i2p::data::RouterInfo::eSSUTesting | i2p::data::RouterInfo::eSSUIntroducer); // LR, BC
 		routerInfo.SetProperty ("coreVersion", I2P_VERSION);
-		routerInfo.SetProperty ("netId", "2");
+		routerInfo.SetProperty ("netId", std::to_string (I2PD_NET_ID));
 		routerInfo.SetProperty ("router.version", I2P_VERSION);
 		routerInfo.SetProperty ("stat_uptime", "90m");
 		routerInfo.CreateBuffer (m_Keys);
diff --git a/RouterInfo.cpp b/RouterInfo.cpp
index 53ab7aa3..8f2b7bfe 100644
--- a/RouterInfo.cpp
+++ b/RouterInfo.cpp
@@ -3,6 +3,7 @@
 #include "I2PEndian.h"
 #include <fstream>
 #include <boost/lexical_cast.hpp>
+#include "version.h"
 #include "Crypto.h"
 #include "Base.h"
 #include "Timestamp.h"
@@ -243,6 +244,12 @@ namespace data
 			// extract caps	
 			if (!strcmp (key, "caps"))
 				ExtractCaps (value);
+			// check netId
+			if (!strcmp (key, "netId") && atoi (value) != I2PD_NET_ID)
+			{
+				LogPrint (eLogError, "Unexpected netid=", value);
+				m_IsUnreachable = true;		
+			}	
 		}		
 
 		if (!m_SupportedTransports || !m_Addresses.size() || (UsesIntroducer () && !introducers))
diff --git a/version.h b/version.h
index 8b93f1af..8fea069c 100644
--- a/version.h
+++ b/version.h
@@ -12,6 +12,7 @@
 #define I2PD_VERSION_PATCH 0
 #define I2PD_VERSION MAKE_VERSION(I2PD_VERSION_MAJOR, I2PD_VERSION_MINOR, I2PD_VERSION_MICRO)
 #define VERSION I2PD_VERSION
+#define I2PD_NET_ID 2
 
 #define I2P_VERSION_MAJOR 0
 #define I2P_VERSION_MINOR 9