DNS and domain names

Discussion in 'DNS Server' started by hal, Sep 3, 2004.

  1. hal

    hal Guest

    Do I need to set up DNS, if the server is used to host
    multiple domain names?

    Hal
     
    hal, Sep 3, 2004
    #1
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  2. In
    Are you asking if you need to set up DNS if you host the websites?

    If you are behind NAT and you use private IP addresses, you do if you want
    local access. For you have local access to these sites the names must
    resolve to the private IP address of the webserver. That being the case,
    when you create the zone for these local sites, use the FQDN of the site for
    the zone name, e.g. use www.example.com with a blank host, not example.com
    with a www host. These way all other queries in example.com except
    www.example.com will be passed off to the forwarder or resolved from the
    root.


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    Kevin D. Goodknecht Sr. [MVP], Sep 3, 2004
    #2
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  3. hal

    hal Guest

    Thanks,
    So, if we are only providing email service via pop and
    smtp we do not need to set up dns. dns is required to
    resolve to a specific server behind a nat. Correct?

    hal
     
    hal, Sep 3, 2004
    #3
  4. In
    You would only need to set up DNS if you need access from behind the same
    NAT device. Otherwise the query is simply resolved from the public DNS
    namespace. If you can access by the IP in the public namespace, there would
    be no need for DNS. In the case of mail servers, they don't need to resolve
    their own MX record if the recipient policy has the email domain configured.



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    Kevin D. Goodknecht Sr. [MVP], Sep 3, 2004
    #4
  5. hal

    Guest Guest

    Ok, but, why do i get the following dns errors in the
    event viewer under systems as follows:

    Event Type: Warning
    Event Source: smtpsvc
    Event Category: None
    Event ID: 2012
    Date: 9/3/2004
    Time: 7:10:05 AM
    User: N/A
    Computer: MAIL
    Description:
    SMTP could not connect to the DNS server '198.6.1.122'.
    The protocol used was 'UDP'. It may be down or
    inaccessible.

    For more information, see Help and Support Center at
    http://go.microsoft.com/fwlink/events.asp.
    Data:
    0000: d5 04 00 00 Õ...


    dns is not set up on the windows 2003 server
    however, the 3-com firewall on the nat is set to One to
    Many not one to one
    Hal
     
    Guest, Sep 3, 2004
    #5
  6. hal

    hal Guest

    Here is another specific error, message:

    Event Type: Warning
    Event Source: smtpsvc
    Event Category: None
    Event ID: 2012
    Date: 9/3/2004
    Time: 7:16:35 AM
    User: N/A
    Computer: MAIL
    Description:
    SMTP could not connect to the DNS server '198.6.1.5'. The
    protocol used was 'UDP'. It may be down or inaccessible.

    For more information, see Help and Support Center at
    http://go.microsoft.com/fwlink/events.asp.
    Data:
    0000: d5 04 00 00 Õ...


    Hal
     
    hal, Sep 3, 2004
    #6
  7. In
    Ok, maybe you should bring me up to speed on this, I've tested these two DNS
    servers and they are extremely slow for UDP in excess of 1500 ms for UDP,
    TCP is much better at around 200ms. Are these your ISP's DNS or are they an
    authoritative for an email domain?
    Maybe you should consider setting up a caching only DNS.

    Additionally, are you using Exchange?


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    Kevin D4 Dad Goodknecht Sr. [MVP]
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    Kevin D. Goodknecht Sr. [MVP], Sep 3, 2004
    #7
  8. hal

    Guest Guest

    no exchange here
    but, these domains in the error messages do not belong to
    us. our domain is dslcomputer.biz
     
    Guest, Sep 3, 2004
    #8
  9. In <>
    wrote their comments
    Then Kevin replied below:
    OK, well the problem aparently is with the DNS servers that holds the zone
    for the email address, as I said they test very slow or time out.
    Query time: 1483 ms
    Server : 198.6.1.5:53 udp (198.6.1.5)
    When : 9/3/2004 1:43:55 PM

    Query time: 1643 ms
    Server : 198.6.1.122:53 udp (198.6.1.122)
    When : 9/3/2004 1:48:04 PM


    TCP is a lot faster as you can see.
    Query time: 361 ms
    Server : 198.6.1.5:53 tcp (198.6.1.5)
    When : 9/3/2004 1:44:31 PM

    Query time: 301 ms
    Server : 198.6.1.122:53 tcp (198.6.1.122)
    When : 9/3/2004 1:47:52 PM


    The only thing you might try _is_ to set up a caching only DNS, which might
    help. But I don't know what you can do to speed up someone else's DNS unless
    you know who's DNS it is.


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    Kevin D4 Dad Goodknecht Sr. [MVP]
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    Kevin D. Goodknecht Sr. [MVP], Sep 3, 2004
    #9
  10. hal

    Guest Guest

    Kevin:
    These are spam dns addresses, that,I wish to purge from
    the event viewer.Do you still recommend a DNS cache?
    Hal
     
    Guest, Sep 3, 2004
    #10
  11. In <>
    wrote their comments
    Then Kevin replied below:
    Yes, I would, you should set up a caching only DNS whenever you can
    especially if you have a mail server.


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    Kevin D4 Dad Goodknecht Sr. [MVP]
    Hope This Helps
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    Kevin D. Goodknecht Sr. [MVP], Sep 3, 2004
    #11
  12. hal

    hal Guest

    Ok, i installed the DNS services on theservice.
    According to these instructions, below:

    "Caching-only DNS servers do not host any zones and are
    not authoritative for a particular domain. They are DNS
    servers that build a local server cache of names learned
    while performing recursive queries on behalf of their
    clients. This information is then available from its cache
    when answering subsequent client queries. "

    As written above, there is no requirement to set up either
    the forward or reverse zone. Do we configure any thing
    else on the caching-only DNS service.

    Hal



     
    hal, Sep 3, 2004
    #12
  13. In
    You can configure it with a forwarder to your ISP (optional) and point all
    your machines to it for DNS.



    --
    Best regards,
    Kevin D4 Dad Goodknecht Sr. [MVP]
    Hope This Helps
    ================================================
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    When responding to posts, please "Reply to Group"
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    benefit from your issue, to respond directly to
    me remove the nospam. from my email address.
    ================================================
    http://www.lonestaramerica.com/
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    Use Outlook Express?... Get OE_Quotefix:
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    http://home.in.tum.de/~jain/software/oe-quotefix/
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    ================================================
     
    Kevin D. Goodknecht Sr. [MVP], Sep 3, 2004
    #13
  14. hal

    Guest Guest

    we use "bcentralhost.com" as the primary
    not "ns2.bcentralhost.com", correct?
    why configure only the forwarding on a cache dns?
     
    Guest, Sep 3, 2004
    #14
  15. In
    For efficiency. Less work on the server. Its optional, as Kevin said.

    Ace
     
    Ace Fekay [MVP], Sep 4, 2004
    #15
  16. In <>
    wrote their comments
    Then Kevin replied below:
    Don't use ns2.bcentralhost.com as a DNS forwarder or for that fact
    ns1bcentraolhost.com, neither of these support recursion and cannot resolve
    any name not in its zones.



    --
    Best regards,
    Kevin D4 Dad Goodknecht Sr. [MVP]
    Hope This Helps
    ================================================
    --
    When responding to posts, please "Reply to Group"
    via your newsreader so that others may learn and
    benefit from your issue, to respond directly to
    me remove the nospam. from my email address.
    ================================================
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    ================================================
    Use Outlook Express?... Get OE_Quotefix:
    It will strip signature out and more
    http://home.in.tum.de/~jain/software/oe-quotefix/
    ================================================
    Keep a back up of your OE settings and folders
    with OEBackup:
    http://www.oehelp.com/OEBackup/Default.aspx
    ================================================
     
    Kevin D. Goodknecht Sr. [MVP], Sep 4, 2004
    #16
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