DNS Configuration for a stable network

Posted on 2005-04-19
Last Modified: 2010-04-18
I have three servers in my DMZ.

1 Web Server / External DNS / DHCP
1 Exchange 2003 Server / External DNS
1 Internal DNS Server

I have been having many DNS issues, and I am trying to resolve them. Below are three links to screenshots of the DNS.

When I run or nslookup, I get many errors.

Could someone please help me work through these issues.

Question by:jacobbeckley
    LVL 13

    Expert Comment

    I appreciate your info, but I would be careful showing detailed information about your site.  Some could use this information to make it easier to hack.  Your problem may be with a misinterpretation of DNS setup.  I see you have a www. host A record.  Is this because your internal domain is the same as an external one?  What do you mean by external DNS?
    LVL 9

    Accepted Solution

    Can you give examples of errors? One thing I can see already is that you have duplicates of reverse lookup zones. when you specify 192.169.x.x then all subnets under that address will be created automatically. Still I do not think it will create any problem

    Author Comment

    That is correct the www. host a record is there because my internal dns is the same as the external.

    I am pointing my domain to this server for name resolution, it is acting as my NS for the domain.


    Some of the errors include not being able to send email to another server in network through exchange.
    Problems with Exchange crashing.
    Problems resolving requests externally and internally.

    LVL 8

    Expert Comment

    Do you list the external server in your dns? If so dont. Only list your internal server in your dns. Tell your internal dns server to not use fowards, but it will still ask a real world dns server for domain lookup that it does not have localy
    LVL 5

    Expert Comment

    can i ask what is your internal domain called?

    is the same as the external domain?

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    How to run any project with ease

    Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
    - Combine task lists, docs, spreadsheets, and chat in one
    - View and edit from mobile/offline
    - Cut down on emails

    by Batuhan Cetin Within the dynamic life of an IT administrator, we hold many information in our minds like user names, passwords, IDs, phone numbers, incomes, service tags, bills and the order from our wives to buy milk when coming back to home.…
    ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.
    Internet Business Fax to Email Made Easy - With eFax Corporate (, you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…
    In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

    737 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    22 Experts available now in Live!

    Get 1:1 Help Now