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 … Read More « Is it more secure to have a random outbound port number or an assigned one? » »
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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 … Read More « Dns root servers are located on dns root hierarchy? » »
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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 … Read More « How to handle mutliple primary DNS zones – Internal vs Exteranl… multiple authoritive servers? » »