[ratelimits] CH/TXT/id.server queries rate-limited

Jay Daley jay at nzrs.net.nz
Thu Oct 25 23:42:27 UTC 2012

On 26/10/2012, at 10:46 AM, Anand Buddhdev <anandb at ripe.net> wrote:

> It looks like rate-limits kick in for this network, but two or three
> seconds later the rate-limit is removed. There are many such log lines,
> showing the limit being removed around two seconds after it is first
> applied. I thought the limit would be enforced for at least "window"
> seconds. Have I misunderstood something?

This is a common characteristic of token bucket rate limiting systems where the frequency of events being rate-limited is only just above the limit and the alignment of those events with the boundaries of the token bucket window is not consistent.  For example if 100 queries are sent in 10 seconds, with a limit of 10 qps then you often see a pattern of queries per bucket similar to 11/9/11/9/11/9/11/9 and so the rate limiting goes on/off/on/off/on/off/on/off.


> Regards,
> Anand
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Jay Daley
Chief Executive
.nz Registry Services (New Zealand Domain Name Registry Limited)
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