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flow-mask — Apply tags to flow files.


flow-mask [-hk] [-b big|little] [-C comment] [-d debug_level] [-m mask_fname] [-M
active_def ...]


The flow-mask utility is used to modify the source and destination mask length's in flow


-b big|little
Byte order of output.

-C Comment
Add a comment.

-d debug_level
Enable debugging.

-h Display help.

-k Keep time from input.

-m mask_fname
Load masks from mask_name. Defaults to /etc/flow-tools/cfg/mask

-M mask_def
Use active_def as the active tag definition(s).

The configuration file is a collection of definitions. A definition lists a sequence of
prefixes and the mask length to replace the matching prefix with. Lines begining with #
are treated as comments and ignored.

mask-definition command Description
mask-definition Begin mask-definition section
mask-definition foo

prefix List the prefix to match on and the
replacement mask.
prefix 128.146/16 24


#file: masks
mask-definition foo
# All networks in 128.146/16 are /24's.
prefix 128.146/16 24
# except for 128.146.214/24, which are /32's.
prefix 128.146.214/24 32

flow-cat flows | flow-mask -mfoo -Fmasks | flow-print -f4

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