Actualité Internet et DNS

I have been doing some research regarding DNS servers and had a question regarding port numbers. I noticed that when configuring a DNS server you can choose to have the outbound port number either be a random open port port or have it come out an assigned port. Which one would be a more secure route? I had heard that the more open ports are available the less secure a system can be.

Hi, i have a question about the dns root servers. For example if i want to resolve a domain www.google.com. i start from the dot(.) and then i go down(tree) and i find the com. and then another level down is the google.com. etc. The question is the f.root-servers.net which is a dns root server is located under the .net and then another level down root-servers.net etc?

Thanks in advance!

Lets say hypothetically you have a primary domain ‘example.com’. You have an external IP block 60.50.100.0/24 and internal IP block 10.150.0.0/24.

How would you handle issuing different IPs depending on the source network performing the lookup?

Eg. http://serviceA.example.com has two network interfaces. The internal host performing a lookup should get internal IP instead of external IP. The external host should get the external IP on lookup.

Isn’t it bad practice to run multiple servers authoritative over the same primary zone?

Is there a way you can tell the internal DNS server to forward to the external server? Since both have the primary zone, if possible, I assume there may be some special configuration required.

This is something I’m trying to figure out in a Windows Server lab so I’d rather not get BIND into this.

Thoughts?