 DNS problem
Hi all,
My local network is using Local DNS server and Local DNS servers using external DNS forwarder for DNS queries. External DNS servers are my ISP's DNS servers. But in Smartdefense i view blocked DNS connection. This logs are creating every 2 seconds. Log details;
Attack Name:Invalid DNS
Attack Information: Out of state DNS reply
Source: sometimes External Interface, sometimes My ISP's DNS server , sometimes Internal Mail server (in DMZ)
Destination: sometimes My internal DNS servers, sometimes My ISP's DNS server IP address etc.
Accept Domain name over UDP is enabled.
I think this connections is not a attack but blocked by Smartdefense. What is a problem? |