preoblem with DNS (A) records

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This topic contains 6 replies, has 4 voices, and was last updated by Avatar gogi100 7 years, 1 month ago.

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    gogi100
    Member
    #160258

    So, my company has bought a hosting package. the hosting of ISP contains web, mail …. My company wants that mail server exists in the DMZ in my company.
    I have asked the ISP provider to enroll (A) record for my mail server, mail.domen.com CNAME and MX record for mail.domen.com. Provider told me that on the DNS server in the zone domen.com there is one (A) record for their DNS server and it is impossible to write another one because of nobody wouldn’t see to our company website. I typed the command
    nslookup
    >server domen.com
    >ls -d domen.com

    Quote:
    [domen.com]
    domen.com. SOA ns1.domen-hosting.com hosting.domen.rs. (
    2012080300 86400 7200 3600000 86400)
    domen.com. MX 0 domen.com
    domen.com. MX 10 mail.domen.com
    domen.com. NS ns1.domen-hosting.com
    domen.com. NS ns2.domen-hosting.com
    domen.com. A x.x.x.55 (address of dns server)
    ftp CNAME domen.com
    localhost A 127.0.0.1
    mail CNAME domen.com
    www CNAME domen.com
    domen.com. SOA ns1.domen-hosting.com hosting.domen.rs. (
    2012080300 86400 7200 3600000 86400)

    I think it is possible to insert next domen.com. A xxx55 (DNS server address) and domen.com A xxx179 (my address MailServer) and the mail alias CNAME at domen.com A xxx179 (the address of my mail server).
    If this is not possible what I would do to resolve this problem?
    thank you

    Avatar
    gogi100
    Member
    #334970

    Re: preoblem with DNS (A) records

    which DNS records i need for my mail server that he work ok? is it A record, mx record, cname record? maybe just a record and mx record?
    thanks

    Avatar
    Ossian
    Moderator
    #187560

    Re: preoblem with DNS (A) records

    MX records — at least if you are asking about receiving email — must point to your public IP address

    Avatar
    gogi100
    Member
    #334971

    Re: preoblem with DNS (A) records

    i want that my mail server receive and send mails. for that records i ask my provider that he put them in the zone?
    but in dns zone of my provider there’are not records for my mail server except mx record. dns server cannot resolve name of my server in ip address

    Avatar
    AndyJG247
    Member
    #323428

    Re: preoblem with DNS (A) records

    You need MX and A records. MX point to the A record and the A record to the mail servers public IP. You should not have MX records pointing to CNAME records.

    I would expect an ISP to know this though?

    Generally you wouldn’t put mailservers in a DMZ too.

    http://en.wikipedia.org/wiki/MX_record

    Avatar
    gogi100
    Member
    #334972

    Re: preoblem with DNS (A) records

    Quote:
    Generally you wouldn’t put mailservers in a DMZ too.

    why i don’t put mail servers in DMZ?

    Avatar
    wullieb1
    Moderator
    #244031

    Re: preoblem with DNS (A) records

    Because your email servers have access to your AD infrastructure and if it gets compromised your AD structure is compromised.

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