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# erratic
*erratic* is a middleware useful for testing client behavior. It returns a static response to all
queries, but the responses can be delayed, dropped or truncated.
The *erratic* middleware will respond to every A or AAAA query. For any other type it will return
a SERVFAIL response. The reply for A will return 192.0.2.53 (see RFC 5737), for AAAA it returns
2001:DB8::53 (see RFC 3849).
## Syntax
~~~ txt
erratic {
drop [AMOUNT]
truncate [AMOUNT]
delay [AMOUNT [DURATION]]
}
~~~
* `drop`: drop 1 per **AMOUNT** of queries, the default is 2.
* `truncate`: truncate 1 per **AMOUNT** of queries, the default is 2.
* `delay`: delay 1 per **AMOUNT** of queries for **DURATION**, the default for **AMOUNT** is 2 and
the default for **DURATION** is 100ms.
## Examples
~~~ txt
.:53 {
erratic {
drop 3
}
}
~~~
Or even shorter if the defaults suits you. Note this only drops queries, it does not delay them.
~~~ txt
. {
erratic
}
~~~
Delay 1 in 3 queries for 50ms
~~~ txt
. {
erratic {
delay 3 50ms
}
}
~~~
Delay 1 in 3 and truncate 1 in 5.
~~~ txt
. {
erratic {
delay 3 5ms
truncate 5
}
}
~~~
Drop every second query.
~~~ txt
. {
erratic {
drop 2
truncate 2
}
}
~~~
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