host appears to give similar results:
$ seq 1 10 | xargs -i host -v google.com | grep ^Recei | grep -o
8.8.[0-9.#]* | uniq -c
30 8.8.8.8#53
As for the strace, can you give an example of what I should be looking for?
Regards,
- Robert
On Tue, Sep 11, 2012 at 10:09 AM, Andrew Freiberger
<[email protected]> wrote:
> my guess is that "dig" is not set to use the resolv libraries, but instead
> figures out a nameserver using the resolv.conf file and then goes about it's
> own business. If you did a "strace" on the "host <dns name>" command, I
> wonder if you'd see the resolver flip-flopping in your socket connections.
>
> -Drew
>
> On Tue, Sep 11, 2012 at 8:49 AM, Robert Citek <[email protected]>
> wrote:
>>
>> I am puzzled by the rotate option in /etc/resolv.conf. From the man page:
>>
>> rotate
>> sets RES_ROTATE in _res.options, which causes round robin selection of
>> nameservers from among those listed. This has the effect of spreading
>> the query load among all listed servers, rather than having all
>> clients try the first listed server first every time.
>>
>> $ cat /etc/resolv.conf
>> options rotate
>> nameserver 8.8.8.8
>> nameserver 8.8.4.4
>>
>> However if I run multiple tests with dig, I always hit the same
>> server, the first server:
>>
>> $ seq 1 100 | xargs dig +noall +stats google.com | grep SERVER | uniq -c
>> 101 ;; SERVER: 8.8.8.8#53(8.8.8.8)
>>
>> To demonstrate, if I swap the position of the first and second nameserver:
>>
>> $ cat /etc/resolv.conf
>> options rotate
>> nameserver 8.8.4.4
>> nameserver 8.8.8.8
>>
>> And rerun the test:
>>
>> $ seq 1 100 | xargs dig +noall +stats google.com | grep SERVER | uniq -c
>> 101 ;; SERVER: 8.8.4.4#53(8.8.4.4)
>>
>>
>> That does not look like round-robin. What am I missing?
>>
>> Regards,
>> - Robert
>> _______________________________________________
>> Discuss mailing list
>> [email protected]
>> http://www.sluug.org/mailman/listinfo/discuss
>
>
>
> _______________________________________________
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>
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