DNS help

By Mamut0o1 ยท 4 replies
May 14, 2008
  1. I'm trying to design a way so if host "A" fails Host "B" will take over.
    If my computer can not connect to Host "A" DNS will resolve to go to Host "B".
    I was hoping in anyone could help me how to set this up using a DNS server.
  2. jobeard

    jobeard TS Ambassador Posts: 11,166   +986

    that's automatic in the TCP config. If you look, there should be TWO DNS addresses.
    Failure on the first (or a timeout) will cause the second to be used.

    HOWEVER: you can't just slam in any two DNS addresses!

    If you want to use manual DNS configuration, then you must be able to use
    nslookup www.google.com dns-addr-1
    nslookup www.google.com dns-addr-2
    both requestions must return an IP address for google -- anything else will mean
    that the dns-addr-x used may be valid but is not configured for a recursive query and
    you MUST find some other dns address to use.

    You would be better off using the TCP DHCP supplied DNS address(es)
  3. gilloz

    gilloz TS Rookie Posts: 88

    Have you considered OpenDNS.com? Check it out.
  4. Justin

    Justin TS Rookie Posts: 942

    The file /etc/resolv.conf is where your current DNS settings are stored.

    What exactly is your concern with DNS? Are you having trouble with your ISP's DNS servers not responding?

    I strongly suggest NOT using OpenDNS.
  5. jobeard

    jobeard TS Ambassador Posts: 11,166   +986

    Can you qualify that recommendation please. There are several good reasons for
    using it, including avoiding the DNS poisoning threat.

    see Computerworld article
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