Low complexity filtering in standalone blastn

[balaena]

Hi

I have difficulties understanding if low-complexity filtering for the query is on by default in standalone blastn.

In the description it says:

-dust <String>
   Filter query sequence with DUST (Format: 'yes', 'level window linker', or
   'no' to disable)
   Default = `20 64 1'

- what does `20 64 1' mean?
- If option -dust is not used at all, is it on or off?

If ON, do you have to specifiy lower case masking (-lcase_masking) or is this also the default for low-complexity?


Best