A certain percentage of queries will always go to all of the forwarders
listed.
If you have servers A B and C and A is the fastest SRTT, whenever A answers
the SRTT for B and C will be decremented by a small percentage. Eventually
they will be lower than A and get used. The likely result is that they will
be higher and it will go back to A.
This method is needed to ensure that a server that gets a high SRTT due to
being down is eventually used and gets back to it's normal SRTT.
On Apr 23, 2012 8:20 AM, <antti-jussi.korjo...@nokia.com> wrote:
> Hello****
>
> ** **
>
> I have this kind of forwarders configuration. 192.168.100.1 has 3ms RTT***
> *
>
> 192.168.200.1 has 150ms RTT****
>
> ** **
>
> options {****
>
> forwarders {****
>
> 192.168.100.1;****
>
> 192.168.200.1;****
>
> };****
>
> };****
>
> ** **
>
> Usually all queries go to 192.168.100.1 but occasionally it experiences***
> *
>
> high load which obviously has effect on SRTT.****
>
> This causes that 12% of the queries are forwarded to 192.168.200.1. ****
>
> ** **
>
> I want that 192.168.200.1 is used only when 192.168.100.1 is down or is***
> *
>
> experiencing really high latency.****
>
> ** **
>
> I tried adding 192.168.100.1 multiple times in forwarders section but****
>
> it didn’t help.****
>
> ** **
>
> Is there any way around this?****
>
> Any way to manually tweak SRTT per server?****
>
> ** **
>
> Regards,****
>
> Antti-Jussi Korjonen****
>
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