Nov 06

How to improve DNS lookups by using multiple nameservers

IT-Tips, Linux Add comments
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This tip shows you how to improve DNS lookups by using multiple nameservers. This is useful if you’ve ever had your primary DNS server become unreachable for any reason.

Nameservers are listed in /etc/resolv.conf, one per line.

Code Listing 1: Example /etc/resolv.conf

nameserver 192.168.1.1
nameserver 10.0.0.1

To improve DNS lookups, add multiple DNS servers (preferably on different subnets) and the following options to /etc/resolv.conf:

Code Listing 2: /etc/resolv.conf options

options rotate
options timeout 1

This will use both nameserver in rotation and wait max. 1 second for answer before trying the next one.


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    • One Response to “How to improve DNS lookups by using multiple nameservers”

    1. Kim Says:
      January 19th, 2009 at 7:55 am

      Lookup Name Servers of a website using this free online tool at: tools.khrido.com/webtools/mx-ns-soa-lookup.aspx

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    How to improve DNS lookups by using multiple nameservers


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