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  • DNS Issues (Internal / External IP)

    After several hours of going round in circles I have admitted defeat as my knowledge of SBS and DNS is at a beginner's level.

    I have an annoying director who wants to be able to use pop3 to retrieve his email when he's in and out of the office. At present I can only get this to work on one or the other. The problem I have is that using the pop3 as mail.domain.com when external resolves to our external IP which port forwards to the server and all is well. This was been tested using telnet and connects fine. However when he comes in the office mail.domain.com cannot resolve (telnet confirms this) and so hence I have to make a settings change on his laptop for things to work such as change the pop3 setting to the servers internal ip address.

    I have tried adding a forwarding zone in DNS for mail.domain.com which points to domain.local but it still resolves to the external ip address.

    Has anyone got any ideas to help as I urgently need to resolve this for Monday. All help would be greatly appreciated

    Thanks

  • #2
    Re: DNS Issues (Internal / External IP)

    I think I have fixed it. I started again from scratch. Deleted all entries in DNS that I had created in the Forward Zone. I then ran ipconfig /flushdns followed by ipconfig /displaydns and noticed something very odd. Each individual website hosted on the server was showing and all there CNAMES were interlinked.

    Low and behold someone, whilst I was away on annual leave has manually edited the hosts file and added loads of websites to the servers ip address. I removed these and then added a forward zone in and restarted the dns server and mail.domain.com is now resolving to the servers internal ip address.

    More testing on Monday now.

    Thanks

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    • #3
      Re: DNS Issues (Internal / External IP)

      Well done for resolving this (it's not that simple!!) and thank you VERY much for showing the community spirit to come back and let us know. Have some sticky toffee rep points


      Tom
      For my own and your protection, I do not provide support by private message under any circumstances. All such messages will be deleted and ignored.

      Anything you say will be misquoted and used against you

      Comment


      • #4
        Re: DNS Issues (Internal / External IP)

        Originally posted by zergonuk View Post
        Low and behold someone, whilst I was away on annual leave has manually edited the hosts file and added loads of websites to the servers ip address. I removed these and then added a forward zone in and restarted the dns server and mail.domain.com is now resolving to the servers internal ip address.:
        Did you mean that someone edited the hosts file on the client machines or on the DNS server? Who, pray tell, might have done this editing and how will you exact justice from them?
        Wesley David
        LinkedIn | Careers 2.0
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        • #5
          Re: DNS Issues (Internal / External IP)

          Electrified door handles usually work for me.

          Or just remote control the gas-lift chair and see how long it takes them to start limping.
          Gareth Howells

          BSc (Hons), MBCS, MCP, MCDST, ICCE

          Any advice is given in good faith and without warranty.

          Please give reputation points if somebody has helped you.

          "For by now I could have stretched out my hand and struck you and your people with a plague that would have wiped you off the Earth." (Exodus 9:15) - I could kill you with my thumb.

          "Everything that lives and moves will be food for you." (Genesis 9:3) - For every animal you don't eat, I'm going to eat three.

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