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I came across of a situation in which I can see internal ip and external ip accessing a corporate dns server. I do not know if the dns server is internal dns or external dns. I have very limited information.

What will be the use case for this kind of set up? What are the potential security risk?

  • What avoids to check the local network params and the current dns address? It would be visible on the first spot, where is the dns. Btw, I think it is a little bit too broad and maybe opinion-based. I don't think it would have a direct security relation. – user259412 Feb 16 '17 at 5:10
  • Little information was provided to me. What I do know that is DNS server is connected to both the intranet and internet. I am hoping to understand what is the rational of have this setup so that I can better improve the security with minimal disruptions – Shawn Sim Feb 16 '17 at 5:38
  • Ok, but you can see its ip and network oarams, isn't? It is not a security issue, it is more like a serverfault or gesystem stability issue, in my opinion. A dns with 2 ips are essentially 2 different dns in the view of the client systems. It doesn't has to do any specific with security. – user259412 Feb 16 '17 at 5:42
  • So a design like this that exposes a DNS server to internet and intranet are actually meant for having two dns zones? One for resolving host in intranet and one for resolving host for internet? – Shawn Sim Feb 16 '17 at 6:13
  • In this case is is safe to do something like this? What I usually see is that there are usually 2 dns servers one in the DMZ for external use and behind the firewall serving the intranet only. – Shawn Sim Feb 16 '17 at 6:15

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