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Zak
Asked: 2010-12-17 14:39:47 +0800 CST

How to configure the timeout that ping uses to resolve a hostname with first and second name servers

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According to the man page for resolv.conf, I should be able to specify a few options for how the resolver will resolve a given hostname for lookup: http://linux.die.net/man/5/resolv.conf

I know my nameservers are local and should respond quickly, therefore I want the timeout to be 2 seconds (maybe 1S). I also want to randomly swap which nameserver I will be hitting. So Ip ut together the following config according to the docs:

nameserver 10.10.1.15
nameserver 10.10.1.16
option timeout:1
option rotate
option attempts:1

However, it still takes about 5 seconds between each ping when I nerf my first name server entry :

nameserver 10.10.1.250
nameserver 10.10.1.16
option timeout:1
option rotate
option attempts:1

Further, I don't get the expected 5s, 1s, 5s, 1s delay I would expect if the resolver was round-robin-ing the requests between the first and second NS... Does anybody know why, or how to make it do what I want?

Thanks ...

domain-name-system resolv.conf timeout failover

1 Answers

  1. Best Answer

    The correct syntax is:

    nameserver 10.10.1.15
nameserver 10.10.1.16
options timeout:1 rotate attempts:1
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