don't change router status from ipv6

libi2pd/RouterContext.cpp

@@ -457,6 +457,8 @@ namespace i2p
 	}
 
 	void RouterContext::SetUnreachable (bool v4, bool v6)
+	{
+		if (v4)
 		{	
 			// set caps
 			uint8_t caps = m_RouterInfo.GetCaps ();
@@ -464,6 +466,7 @@ namespace i2p
 			caps |= i2p::data::RouterInfo::eUnreachable;
 			caps &= ~i2p::data::RouterInfo::eFloodfill;	// can't be floodfill
 			m_RouterInfo.SetCaps (caps);
+		}	
 		uint16_t port = 0;
 		// delete previous introducers
 		auto& addresses = m_RouterInfo.GetAddresses ();
@@ -484,6 +487,8 @@ namespace i2p
 	}
 
 	void RouterContext::SetReachable (bool v4, bool v6)
+	{
+		if (v4)
 		{	
 			// update caps
 			uint8_t caps = m_RouterInfo.GetCaps ();
@@ -492,6 +497,7 @@ namespace i2p
 			if (m_IsFloodfill)
 				caps |= i2p::data::RouterInfo::eFloodfill;
 			m_RouterInfo.SetCaps (caps);
+		}	
 		uint16_t port = 0;
 		// delete previous introducers
 		auto& addresses = m_RouterInfo.GetAddresses ();