set reachable/unreachable for v4 only

RouterContext.cpp

@@ -226,7 +226,8 @@ namespace i2p
 		auto& addresses = m_RouterInfo.GetAddresses ();
 		for (auto it = addresses.begin (); it != addresses.end (); it++)
 		{
-			if ((*it)->transportStyle == i2p::data::RouterInfo::eTransportNTCP)
+			if ((*it)->transportStyle == i2p::data::RouterInfo::eTransportNTCP &&
+				(*it)->host.is_v4 ())
 			{
 				addresses.erase (it);
 				break;
@@ -255,7 +256,8 @@ namespace i2p
 		auto& addresses = m_RouterInfo.GetAddresses ();
 		for (auto addr : addresses)
 		{
-			if (addr->transportStyle == i2p::data::RouterInfo::eTransportSSU)
+			if (addr->transportStyle == i2p::data::RouterInfo::eTransportSSU &&
+				addr->host.is_v4 ())
 			{
 				// insert NTCP address with host/port from SSU
 				m_RouterInfo.AddNTCPAddress (addr->host.to_string ().c_str (), addr->port);