DNS Question

Posted on 2014-08-31
Last Modified: 2016-05-23

I have the following DNS but it is not pointing correctly.

What I have is one website that checks the url and pulls info from the DB based on the URL.

I have about 50 domains pointed to the same ip but only one website actually on the IP... hope that makes sense.

It was all working great until I changed the default website for that IP to another page that I am testing, it broke all of the other pages. I thought it would be fine since the cname is pointed to the main website, but it did not work.

Can you please let me know how to resolve this.

Subdomain       Name Server               TTL       Actions               14400                   14400       

There are currently no MX resource records

Name       IP Address               TTL       Actions
@               14400
mail               14400

There are currently no AAAA resource records

Alias       Hostname               TTL       Actions               14400

There are currently no TXT resource records
There are currently no SRV resource records

Question by:movieprodw
    LVL 70

    Expert Comment

    by:Chris Dent
    This is not permissible according to DNS RFCs:
    Alias       Hostname               TTL       Actions

    Open in new window

    I would not expect it to be reliable. It breaks the ANY response DNS clients get back because address records are not returned.

    However, I don't think that's the cause of your problem (red flags, sirens, all that kind of thing, but likely to be unrelated).

    I would hypothesise that the page you've changed was the one answering on any name? The one you have left only answers when is in the host header?

    DNS will not change the name used to access a resource (it is not responsible for URL rewriting). Therefore if a user enters the web server must be prepared to answer a request for that name, even if your content is drawn from something you refer to as

    Any good?

    LVL 76

    Expert Comment

    As chris pointed out, a CNAME for the domain name itself is a problem,  The impact will be only on mail handling, and since you do not have it setup, it does not really matter. I suspect, that your domain registrar/dns console provide might actually
    The other issue is that URL are often prepended with which in your case does not exist nor is the cname.
    Your other issue deals with the conflict of
    Host entry
    @ IPaddress

    The two are conflicting.

    If you must, replace the CNAME YOU have with the

    It is unclear what changes you made nor what your script was trying to do.

    Presumably, your default page was determining what the requested URL is and would process the response accordingly.
    LVL 32

    Expert Comment

    Although your DNS setup is not RFC compliant, your problem is in your "home page" code, not your DNS.

    For example, this is the response I get when trying to access

    HTTP/1.1 302 Moved Temporarily
    Date: Tue, 02 Sep 2014 08:06:07 GMT
    Server: Apache
    X-Powered-By: PleskLin
    Content-Length: 0
    Connection: close
    Content-Type: text/html; charset=UTF-8

    Something redirects requests that are not to the raw IP address, where the defasult web site kicks in. It is either a rewrite in Apache httpd.conf or a piece of code in the default page.

    You have Plesk which is the main suspect and where I would start my troubleshooting efforts.
    LVL 11

    Accepted Solution

    Despite the RFC compliance issues already mentioned this sounds more like a problem with the virtual host configuration and not DNS

    Having several domains point to a single site is nothing new - I do it all the time - but regardless of the number of domains pointing to the same host whether by A or ALIAS records, it will fail if you are asking for an unrecognised domain or subdomain if there are not rules in place to handle such requests, either in the virtual host CONF file or the .htaccess file in the docroot, or both.

    So the question is what exactly did you change & where did you change it?

    If it was a DNS change you made, then I would suggest that was a mistake as propagation may take more time than you expect to be complete and then you also have DNS cache on individual workstations to contend with meaning you could be dealing with out of date DNS data for some days after the change.

    Far better & quicker (IMHO) to make changes to the virtual host - edit the .htaccess and the changes are immediate, edit the host CONF file and the changes take effect when you restart the Apache service
    LVL 15

    Assisted Solution

    i agree with mufur.  

    whatever it is, check if all the dns names, are resolving to the desired ip address.

    And, on your webserver, make sure you configure the virtual hosting to accept the desired hostname in the URL parts.

    For Apache:

    For any other web server, make sure you check out the Virtual Hosting section of the docs.

    LVL 1

    Author Comment

    Okay, I will test this, thank you

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